Index of Latin Names (Vascular Plants with Photographs)

Abeliophyllum distichum Nakai — white forsythia — 7 images — in Oleaceae

Abies balsamea (L.) P.Miller — balsam fir — 32 images — in Pinaceae

Abies concolor (Gordon & Glend.) Lindley ex Hildebrand — white fir, Colorado fir — 10 images — in Pinaceae

Abutilon theophrasti Medik. — velvetleaf Indian mallow, velvetleaf, velvet plant, velvetweed, crownweed, buttonweed, Chinese jute — 8 images — in Malvaceae

Acalypha gracilens A.Gray — slender three-seeded mercury — 8 images — in Euphorbiaceae

Acalypha rhomboidea Raf. — broad three-seeded mercury — 18 images — in Euphorbiaceae

Acalypha virginica L. — Virginia three-seeded mercury — 10 images — in Euphorbiaceae

Acer campestre L. — hedge maple, field maple — 3 images — in Sapindaceae

Acer ginnala Maxim. — Amur maple — 7 images — in Sapindaceae

Acer glabrum Torr. — Rocky Mountain maple — 1 images — in Sapindaceae

Acer negundo var. negundo L. — boxelder — 18 images — in Sapindaceae

Acer negundo var. violaceum (G.Kirchn.) H.Jaeg. — purple boxelder — 23 images — in Sapindaceae

Acer palmatum Thunb. — Japanese maple — 8 images — in Sapindaceae

Acer pensylvanicum L. — striped maple — 36 images — in Sapindaceae

Acer platanoides L. — Norway maple — 40 images — in Sapindaceae

Acer pseudoplatanus L. — sycamore maple — 20 images — in Sapindaceae

Acer rubrum L. — red maple — 118 images — in Sapindaceae

Acer saccharinum L. — silver maple — 42 images — in Sapindaceae

Acer saccharum var. saccharum Marsh. — sugar maple — 30 images — in Sapindaceae

Acer spicatum Lam. — mountain maple — 16 images — in Sapindaceae

Acer tataricum L. — Tatarian maple — 6 images — in Sapindaceae

Achillea millefolium ssp. lanulosa (Nutt.) Piper — common yarrow, seaside yarrow — 23 images — in Asteraceae

Achillea millefolium ssp. millefolium L. — European yarrow — 8 images — in Asteraceae

Acorus americanus (Raf.) Raf. — several-veined sweetflag, American sweetflag — 2 images — in Acoraceae

Acorus calamus L. — single-veined sweetflag — 18 images — in Acoraceae

Actaea pachypoda Ell. — white baneberry, doll's eyes — 25 images — in Ranunculaceae

Actaea racemosa L. — black bugbane, black cohosh, black snakeroot — 6 images — in Ranunculaceae

Actaea rubra (Aiton) Willd. — red baneberry — 25 images — in Ranunculaceae

Actinidia arguta (Sieb. & Zucc.) Planch. ex Miq. — bower actinidia, tara vine — 21 images — in Actinidiaceae

Adiantum pedatum L. — northern maidenhair fern — 15 images — in Pteridaceae

Aegopodium podagraria L. — goutweed, bishop's weed — 33 images — in Apiaceae

Aesculus hippocastanum L. — horse chestnut — 18 images — in Sapindaceae

Aesculus parviflora Walt. — bottlebrush buckeye — 16 images — in Sapindaceae

Aethusa cynapium L. — fool's parsley — 13 images — in Apiaceae

Agalinis decemloba (Green) Pennell — ten-lobed false foxglove, sandplain false foxglove, sandplain gerardia — 8 images — in Orobanchaceae

Agalinis maritima ssp. maritima (Raf.) Raf. — saltmarsh false foxglove, seaside gerardia — 18 images — in Orobanchaceae

Agalinis paupercula var. paupercula (A.Gray) Britton — small-flowered false foxglove, small-flowered gerardia — 16 images — in Orobanchaceae

Agalinis purpurea (L.) Pennell — purple false foxglove, purple gerardia — 33 images — in Orobanchaceae

Agalinis tenuifolia var. tenuifolia (Vahl) Raf. — slender false foxglove, slender gerardia — 6 images — in Orobanchaceae

Agastache foeniculum × A. rugosa (Fisch. & C.A.Mey.) Kuntze — lavender giant hyssop × wrinkled giant hyssop — 5 images — in Lamiaceae

Ageratina altissima var. altissima (L.) King & H.E.Robinson — white snakeroot — 20 images — in Asteraceae

Ageratina aromatica (L.) Spach — lesser snakeroot, aromatic snakeroot — 6 images — in Asteraceae

Agrimonia gryposepala Wallr. — common agrimony — 36 images — in Rosaceae

Agrimonia striata Michx. — coarse agrimony, grooved agrimony, roadside agrimony — 17 images — in Rosaceae

Agropyron cristatum (L.) Gaertner — crested wheatgrass — 2 images — in Poaceae

Agrostis canina L. — dog bentgrass, velvet bentgrass, brown bentgrass — 6 images — in Poaceae

Agrostis capillaris L. — Rhode Island bentgrass, colonial bent, browntop — 4 images — in Poaceae

Agrostis gigantea Roth — black bentgrass, redtop bentgrass — 6 images — in Poaceae

Agrostis perennans (Walter) Tuckerman — upland bentgrass, upland bent, autumn bent — 8 images — in Poaceae

Agrostis scabra Willd. — rough bentgrass, winter bent, hairgrass, northern ticklegrass — 17 images — in Poaceae

Agrostis stolonifera L. — marsh bentgrass, carpet bentgrass, creeping bentgrass, creeping bent, spreading bent — 4 images — in Poaceae

Ailanthus altissima (P.Miller) Swingle — tree-of-heaven — 77 images — in Simaroubaceae

Aira caryophyllea var. caryophyllea L. — silvery hairgrass, common silverhair grass — 10 images — in Poaceae

Aira praecox L. — strict hairgrass, early silverhair grass — 13 images — in Poaceae

Aizopsis aizoon (L.) V.Grulich — aizoon stonecrop, Siberian stonecrop — 5 images — in Crassulaceae

Ajuga genevensis L. — Geneva bugleweed, standing bugle — 5 images — in Lamiaceae

Ajuga reptans L. — carpet bugleweed, common bugle, blue bugle — 18 images — in Lamiaceae

Akebia quinata (Houtt.) Dcne. — chocolate vine, five-leaflet akebia — 28 images — in Lardizabalaceae

Albizia julibrissin Durazz. — silk tree — 1 images — in Fabaceae

Alcea rosea L. — hollyhock — 10 images — in Malvaceae

Alchemilla mollis (Buser) Rothm. — garden lady's mantle — 2 images — in Rosaceae

Alchemilla vulgaris L. — common lady's mantle — 7 images — in Rosaceae

Aletris farinosa L. — white colic root, unicorn root, white stargrass, crowcorn — 9 images — in Nartheciaceae

Alisma subcordatum Raf. — lesser water plantain, southern water plantain — 24 images — in Alismataceae

Alisma triviale Pursh — larger water plantain, northern water plantain — 8 images — in Alismataceae

Alkekengi officinarum Moensch — Chinese lantern, strawberry groundcherry — 6 images — in Solanaceae

Alliaria petiolata (Bieb.) Cavara & Grande — garlic mustard — 23 images — in Brassicaceae

Allium canadense var. canadense L. — wild garlic, meadow garlic — 10 images — in Amaryllidaceae

Allium carinatum L. — keeled garlic, witch's garlic — 8 images — in Amaryllidaceae

Allium oleraceum L. — European wild garlic — 7 images — in Amaryllidaceae

Allium sativum var. sativum L. — cultivated garlic — 4 images — in Amaryllidaceae

Allium schoenoprasum L. — wild chives — 5 images — in Amaryllidaceae

Allium tricoccum var. tricoccum Aiton — wild leek — 10 images — in Amaryllidaceae

Allium tuberosum Rottler ex Spreng. non Roxb. — garlic chives, Chinese chives, Chinese leek — 7 images — in Amaryllidaceae

Allium vineale L. — field garlic, crow garlic — 10 images — in Amaryllidaceae

Alnus glutinosa (L.) Gaertner — European black alder — 27 images — in Betulaceae

Alnus incana ssp. incana (L.) Moench — grey alder — 8 images — in Betulaceae

Alnus incana ssp. rugosa (Du Roi) R.T.Clausen — speckled alder — 50 images — in Betulaceae

Alnus incana ssp. tenuifolia (Nutt.) Breitung — mountain alder, thinleaf alder — 3 images — in Betulaceae

Alnus serrulata (Ait.) Willd. — smooth alder, common alder — 49 images — in Betulaceae

Alopecurus pratensis L. — meadow foxtail — 9 images — in Poaceae

Althaea officinalis L. — common marsh mallow, medicinal marsh mallow — 12 images — in Malvaceae

Amaranthus albus L. — tumbleweed amaranth — 3 images — in Amaranthaceae

Amaranthus blitoides S.Watson — prostrate amaranth, mat amaranth, matweed, prostrate pigweed, procumbent pigweed — 9 images — in Amaranthaceae

Amaranthus blitum ssp. emarginatus (Moq. ex Uline & Bray) Carretero — livid amaranth — 7 images — in Amaranthaceae

Amaranthus cannabinus (L.) Sauer — tidal marsh amaranth, saltmarsh waterhemp, waterhemp ragweed — 14 images — in Amaranthaceae

Amaranthus caudatus L. — foxtail amaranth, purple amaranth — 7 images — in Amaranthaceae

Amaranthus cruentus × A. powellii — blood amaranth × Powell's amaranth — 7 images — in Amaranthaceae

Amaranthus hybridus L. — green amaranth, slim amaranth, smooth pigweed — 9 images — in Amaranthaceae

Amaranthus hypochondriacus L. — prince's feather amaranth — 2 images — in Amaranthaceae

Amaranthus powellii S.Watson — Powell's amaranth — 8 images — in Amaranthaceae

Amaranthus retroflexus L. — pigweed, redroot amaranth — 2 images — in Amaranthaceae

Amaranthus viridis L. — green amaranth, slender amaranth — 7 images — in Amaranthaceae

Ambrosia artemisiifolia L. — annual ragweed — 26 images — in Asteraceae

Ambrosia psilostachya DC. — perennial ragweed, western ragweed — 2 images — in Asteraceae

Ambrosia trifida var. trifida L. — giant ragweed — 14 images — in Asteraceae

Amelanchier alnifolia (Nutt.) Nutt. — saskatoon berry, western shadbush — 3 images — in Rosaceae

Amelanchier arborea (Michx.f.) Fern. — downy shadbush, downy serviceberry — 14 images — in Rosaceae

Amelanchier bartramiana (Tausch) Roemer — Bartram's shadbush, Bartram's serviceberry, Bartram's juneberry, mountain shadbush, mountain serviceberry, mountain juneberry — 17 images — in Rosaceae

Amelanchier canadensis (L.) Medik. — thicket shadbush, thicket serviceberry, eastern serviceberry, Canadian serviceberry, shadbush serviceberry, shadblow — 62 images — in Rosaceae

Amelanchier laevis Wiegand — smooth shadbush, smooth serviceberry, Allegheny serviceberry — 12 images — in Rosaceae

Amelanchier micropetala (B.L.Robins) Ashe — small-petaled shadbush — 16 images — in Rosaceae

Amelanchier nantucketensis Bickn. — Nantucket shadbush, Nantucket serviceberry, Nantucket juneberry — 18 images — in Rosaceae

Amelanchier sanguinea (Pursh) DC. — round-leaved shadbush, New England serviceberry — 4 images — in Rosaceae

Amelanchier spicata (Lam.) K.Koch — dwarf shadbush, running shadbush, running serviceberry, dwarf serviceberry, low serviceberry, low juneberry — 46 images — in Rosaceae

Amelanchier ×intermedia Spach (pro sp.) — intermediate shadbush, intermediate serviceberry — 61 images — in Rosaceae

Amelanchier ×neglecta Eggleston ex G.N.Jones — overlooked shadbush, overlooked serviceberry — 4 images — in Rosaceae

Ammophila breviligulata Fern. — American dunegrass, American beach grass, American marram grass — 32 images — in Poaceae

Amorpha fruticosa L. — false indigo bush, false indigo — 21 images — in Fabaceae

Ampelopsis glandulosa var. brevipedunculata (Maxim.) Momiy — Amur peppervine, porcelain berry — 23 images — in Vitaceae

Amphicarpaea bracteata (L.) Fern. — American hog peanut — 20 images — in Fabaceae

Amsonia hubrichtii Woodson — Arkansas bluestar — 13 images — in Apocynaceae

Amsonia tabernaemontana var. tabernaemontana Walter — eastern bluestar — 6 images — in Apocynaceae

Anagallis arvensis L. — scarlet pimpernel — 17 images — in Primulaceae

Anaphalis margaritacea (L.) Benth. & Hook.f. — pearly everlasting — 15 images — in Asteraceae

Andromeda polifolia var. glaucophylla (Link) DC. — bog rosemary — 3 images — in Ericaceae

Andropogon gerardii Vitman — big bluestem — 36 images — in Poaceae

Andropogon glomeratus var. glomeratus (Walter) B.S.P. — bushy bluestem, bunched broomsedge — 31 images — in Poaceae

Andropogon virginicus var. virginicus L. — broomsedge bluestem, Virginia broomsedge — 7 images — in Poaceae

Anemonastrum canadense (L.) Mosyakin — Canada windflower — 2 images — in Ranunculaceae

Anemone blanda Schott & Kotschy — Greek windflower — 9 images — in Ranunculaceae

Anemone nemorosa L. — European windflower — 5 images — in Ranunculaceae

Anemone quinquefolia var. quinquefolia L. — wood windflower — 42 images — in Ranunculaceae

Anemone ranunculoides L. — yellow wood windflower, European buttercup anemone — 15 images — in Ranunculaceae

Anemone virginiana var. virginiana L. — stout tall windflower, stout thimbleweed — 12 images — in Ranunculaceae

Angelica atropurpurea L. — purplestem angelica, great angelica, American angelica — 4 images — in Apiaceae

Angelica lucida L. — seaside angelica — 27 images — in Apiaceae

Anisocampium niponicum (Mett.) Yea C.Liu, W.L.Chiou & M.Kato — Japanese painted fern — 8 images — in Woodsiaceae

Antennaria howellii ssp. neodioica (Greene) Bayer — Greene's pussytoes — 10 images — in Asteraceae

Antennaria neglecta Greene — field pussytoes — 8 images — in Asteraceae

Antennaria parlinii ssp. fallax (Greene) Bayer & Stebbins — broad-leaved pussytoes — 4 images — in Asteraceae

Antennaria parlinii ssp. parlinii Fern. — smooth pussytoes, Parlin's pussytoes — 12 images — in Asteraceae

Antennaria plantaginifolia (L.) Richardson — plantain-leaved pussytoes — 19 images — in Asteraceae

Anthemis arvensis L. — field chamomile, dog chamomile, corn chamomile — 9 images — in Asteraceae

Anthoxanthum nitens ssp. nitens (Weber) Y.Schouten & Veldkamp — vanilla sweetgrass, Indian sweetgrass — 11 images — in Poaceae

Anthoxanthum odoratum L. — large sweetgrass, sweet vernalgrass — 21 images — in Poaceae

Anthoxanthum ovatum var. aristatum Pérez-Lara — small sweetgrass, awned vernalgrass, Puel's vernalgrass — 3 images — in Poaceae

Anthriscus sylvestris (L.) Hoffmann — chervil — 24 images — in Apiaceae

Antirrhinum majus L. — common snapdragon, garden snapdragon — 2 images — in Plantaginaceae

Aphanes australis Rydberg — slender parsleypiert — 16 images — in Rosaceae

Apios americana Medik. — American groundnut — 40 images — in Fabaceae

Apium graveolens L. — celery — 7 images — in Apiaceae

Apocynum androsaemifolium L. — spreading dogbane — 15 images — in Apocynaceae

Apocynum cannabinum L. — hemp dogbane, prairie dogbane, Indian hemp — 14 images — in Apocynaceae

Apocynum ×floribundum Greene — hybrid dogbane — 5 images — in Apocynaceae

Aquilegia canadensis L. — wild columbine, red columbine — 43 images — in Ranunculaceae

Aquilegia coerulea E.James — Colorado blue columbine — 3 images — in Ranunculaceae

Aquilegia vulgaris L. — garden columbine, European columbine — 7 images — in Ranunculaceae

Arabidopsis thaliana (L.) Heynh. — mouse-ear cress — 51 images — in Brassicaceae

Aralia elata (Miq.) Seem. — Japanese angelica tree — 30 images — in Araliaceae

Aralia hispida Vent. — bristly sarsaparilla — 36 images — in Araliaceae

Aralia nudicaulis L. — wild sarsaparilla — 48 images — in Araliaceae

Aralia racemosa ssp. racemosa L. — American spikenard — 18 images — in Araliaceae

Aralia spinosa L. — devil's walkingstick, Hercules' club — 5 images — in Araliaceae

Arceuthobium pusillum Peck — eastern dwarf mistletoe — 3 images — in Santalaceae

Arctium lappa L. — greater burdock, great burdock — 5 images — in Asteraceae

Arctium minus Bernh. — lesser burdock, common burdock — 11 images — in Asteraceae

Arctostaphylos uva-ursi (L.) Sprengel — bearberry — 41 images — in Ericaceae

Arenaria serpyllifolia L. — thymeleaf sandwort — 16 images — in Caryophyllaceae

Arethusa bulbosa L. — dragon's mouth — 7 images — in Orchidaceae

Argentina egedei (Wormsk. ex Hornem.) Rydb. — saltmarsh silverweed, Egede's silverweed — 11 images — in Rosaceae

Arisaema stewardsonii Britton — swamp Jack-in-the-pulpit — 14 images — in Araceae

Arisaema triphyllum (L.) Schott ex Schott & Endl. — woodland Jack-in-the-pulpit — 36 images — in Araceae

Aristida basiramea Engelm. ex Vasey — fork-tipped needlegrass, fork-tipped threeawn — 8 images — in Poaceae

Aristida dichotoma var. dichotoma Michx. — poverty grass, churchmouse threeawn — 29 images — in Poaceae

Aristida longespica var. geniculata (Raf.) Fern. — barrens needlegrass, bent red threeawn — 11 images — in Poaceae

Aristida oligantha Michx. — prairie needlegrass, oldfield threeawn — 5 images — in Poaceae

Aristida tuberculosa Nutt. — seebeach needlegrass, seaside threeawn — 14 images — in Poaceae

Armoracia rusticana Gaertner, B.Meyer & Scherb. — horseradish — 5 images — in Brassicaceae

Aronia arbutifolia (L.) Ell. — red chokeberry — 3 images — in Rosaceae

Aronia floribunda (Lindl.) Spach — purple chokeberry — 52 images — in Rosaceae

Aronia melanocarpa (Michx.) Ell. — black chokeberry — 37 images — in Rosaceae

Arrhenatherum elatius ssp. elatius (L.) J.Presl & K.Presl — tall oatgrass — 17 images — in Poaceae

Artemisia annua L. — sweet wormwood, Asian annual wormwood — 16 images — in Asteraceae

Artemisia campestris ssp. caudata (Michx.) Hall & Clements — seaside wormwood, tall wormwood — 19 images — in Asteraceae

Artemisia frigida Willd. — prairie sagewort — 5 images — in Asteraceae

Artemisia stelleriana Bess. — dustymiller, beach wormwood — 16 images — in Asteraceae

Artemisia tridentata Nutt. — sagebrush — 9 images — in Asteraceae

Artemisia vulgaris L. — mugwort, European common wormwood — 26 images — in Asteraceae

Aruncus dioicus (Walter) Fern. — goat's beard — 7 images — in Rosaceae

Asarum canadense L. — Canadian wild ginger — 22 images — in Aristolochiaceae

Asarum caudatum Lindl. — long-tailed wild ginger, western wild ginger — 6 images — in Aristolochiaceae

Asarum europaeum L. — European wild ginger, asarabacca — 2 images — in Aristolochiaceae

Asclepias amplexicaulis Sm. — clasping milkweed — 35 images — in Apocynaceae

Asclepias exaltata L. — tall milkweed, poke milkweed — 11 images — in Apocynaceae

Asclepias incarnata ssp. pulchra (Ehrh. ex Willd.) Woodson — downy swamp milkweed — 41 images — in Apocynaceae

Asclepias purpurascens L. — purple milkweed — 5 images — in Apocynaceae

Asclepias quadrifolia Jacq. — four-leaved milkweed — 3 images — in Apocynaceae

Asclepias syriaca L. — common milkweed — 32 images — in Apocynaceae

Asclepias tuberosa L. — butterfly milkweed — 33 images — in Apocynaceae

Asclepias verticillata L. — whorled milkweed — 8 images — in Apocynaceae

Asimina triloba (L.) Dunal — American papaw, common pawpaw — 2 images — in Annonaceae

Asparagus officinalis L. — garden asparagus — 16 images — in Asparagaceae

Asplenium platyneuron (L.) B.S.P. — ebony spleenwort — 27 images — in Aspleniaceae

Asplenium quadrivalens (D.E.Meyer) Landolt 2010 — western maidenhair spleenwort — 2 images — in Aspleniaceae

Asplenium trichomanes L. — maidenhair spleenwort — 7 images — in Aspleniaceae

Aster indicus (L.) All. — Indian aster — 25 images — in Asteraceae

Astragalus canadensis L. — Canada milkvetch, Canadian milkvetch — 2 images — in Fabaceae

Astrantia major L. — greater masterwort — 6 images — in Apiaceae

Athyrium angustum (Willd.) C.Presl — northern ladyfern — 39 images — in Woodsiaceae

Athyrium asplenioides (Michx.) Desv. — southern ladyfern — 7 images — in Woodsiaceae

Atocion armeria (L.) Raf. — sweetwilliam catchfly — 26 images — in Caryophyllaceae

Atriplex cristata Humb. & Bonpl. ex Willd. — seabeach orache — 11 images — in Amaranthaceae

Atriplex glabriuscula Edmondston — smooth orache, Scotland orache — 12 images — in Amaranthaceae

Atriplex littoralis L. — seaside orache — 8 images — in Amaranthaceae

Atriplex prostrata Bouchér ex DC. — halberd-leaf orache, prostrate orache — 23 images — in Amaranthaceae

Aureolaria flava var. flava (L.) Farw. — smooth false foxglove — 14 images — in Orobanchaceae

Aureolaria pedicularia var. pedicularia (L.) Raf. — fernleaf false foxglove — 37 images — in Orobanchaceae

Aureolaria virginica (L.) Pennell — downy false foxglove — 27 images — in Orobanchaceae

Aurinia saxatilis (L.) Desv. — rock goldentuft, basket-of-gold — 7 images — in Brassicaceae

Avena sativa L. — cultivated oat — 1 images — in Poaceae

Azolla caroliniana Willd. — mosquito fern — 13 images — in Azollaceae

Baccharis halimifolia L. — seamyrtle, groundseltree, saltbush, eastern false willow — 53 images — in Asteraceae

Baptisia australis var. australis (L.) R.Br. ex Ait.f. — blue false indigo — 12 images — in Fabaceae

Baptisia tinctoria (L.) R.Br. ex Ait.f. — yellow wild indigo, horsefly weed — 19 images — in Fabaceae

Barbarea stricta Andrz. — upright yellow rocket, upright wintercress — 3 images — in Brassicaceae

Barbarea verna (P.Mill.) Aschers. — early yellow rocket, early wintercress — 9 images — in Brassicaceae

Barbarea vulgaris W.T.Aiton — common yellow rocket, common wintercress — 46 images — in Brassicaceae

Bartonia paniculata ssp. paniculata (Michx.) Muhl. — panicled screwstem — 6 images — in Gentianaceae

Bartonia virginica (L.) B.S.P. — yellow screwstem, Virginia screwstem — 24 images — in Gentianaceae

Bellis perennis L. — English daisy, lawn daisy — 11 images — in Asteraceae

Benthamidia florida (L.) Spach — flowering dogwood — 50 images — in Cornaceae

Benthamidia florida × B. japonica — hybrid flowering dogwood — 3 images — in Cornaceae

Benthamidia japonica (Sieb. & Zucc.) H.Hara — kousa dogwood, big-bracted dogwood — 9 images — in Cornaceae

Berberis repens Lindl. — creeping mahonia, creeping Oregon grape, creeping barberry — 2 images — in Berberidaceae

Berberis thunbergii DC. — Japanese barberry — 36 images — in Berberidaceae

Berberis vulgaris L. — European common barberry — 24 images — in Berberidaceae

Berberis ×ottawensis C.K.Schneid. — Ottawa hybrid barberry — 4 images — in Berberidaceae

Berteroa incana (L.) DC. — hoary false alyssum, hoary alyssum — 19 images — in Brassicaceae

Berteroa mutabilis (Vent.) DC. — roadside false alyssum, flatpod alyssum — 1 images — in Brassicaceae

Betula alleghaniensis Britton — yellow birch — 57 images — in Betulaceae

Betula cordifolia Regel — heartleaf paper birch, mountain paper birch — 14 images — in Betulaceae

Betula lenta L. — sweet birch, cherry birch, black birch — 37 images — in Betulaceae

Betula nigra L. — river birch — 35 images — in Betulaceae

Betula papyrifera Marsh. — paper birch — 49 images — in Betulaceae

Betula papyrifera × B. populifolia — paper birch × gray birch — 19 images — in Betulaceae

Betula pendula Roth — European weeping birch, European silver birch — 12 images — in Betulaceae

Betula pendula × B. populifolia — European weeping birch × American gray birch — 4 images — in Betulaceae

Betula populifolia Marsh. — gray birch — 53 images — in Betulaceae

Betula pubescens ssp. pubescens Ehrh. — European downy birch — 6 images — in Betulaceae

Betula pumila L. — swamp birch, fen birch — 8 images — in Betulaceae

Betula sp. — unidentified exotic birch — 10 images — in Betulaceae

Bidens cernua L. — nodding bur marigold, nodding beggarticks — 32 images — in Asteraceae

Bidens connata Muhl. ex Willd. — purple-stemmed beggarticks, swamp beggarticks — 15 images — in Asteraceae

Bidens discoidea (Torrey & A.Gray) Britton — small beggarticks — 8 images — in Asteraceae

Bidens frondosa L. — common beggarticks, devil's pitchforks — 22 images — in Asteraceae

Bidens laevis (L.) B.S.P. — smooth beggarticks, smooth marigold — 5 images — in Asteraceae

Bidens polylepis Blake — Ozark beggarticks — 10 images — in Asteraceae

Bidens trichosperma (Michx.) Britton — crowned beggarticks, northern tickseed sunflower — 18 images — in Asteraceae

Bidens tripartita ssp. comosa (A.Gray) A.Haines — three-lobed beggarticks, leafy-bracted beggarticks — 4 images — in Asteraceae

Bidens vulgata Greene — tall beggarticks — 11 images — in Asteraceae

Bistorta amplexicaulis (D.Don) Greene — mountain fleece, red bistort — 10 images — in Polygonaceae

Bistorta bistortoides (Pursh) Small — American bistort — 3 images — in Polygonaceae

Boechera canadensis (L.) Al-Shehbaz — sicklepod rockcress — 19 images — in Brassicaceae

Boechera laevigata (Muhl. ex Willd.) Al-Shehbaz — smooth rockcress — 1 images — in Brassicaceae

Boechera missouriensis (Greene) Al-Shehbaz — green rockcress — 5 images — in Brassicaceae

Boechera stricta (Graham) Al-Shehbaz — Canadian rockcress, Drummond's rockcress — 19 images — in Brassicaceae

Boehmeria cylindrica (L.) Sw. — small-spiked false nettle, bog hemp — 22 images — in Urticaceae

Bolboschoenus maritimus ssp. paludosus (A.Nels.) T.Koyama — seaside bulrush, seaside tuber bulrush — 18 images — in Cyperaceae

Bolboschoenus novae-angliae (Britton) S.G.Smith — long-spiked bulrush, New England tuber bulrush — 6 images — in Cyperaceae

Bolboschoenus robustus (Pursh) Soják — saltmarsh bulrush, saltmarsh tuber blrush — 21 images — in Cyperaceae

Boltonia asteroides var. latisquama (A.Gray) Cronq. — Plains white doll's daisy, Plains false aster — 7 images — in Asteraceae

Botrychium matricariifolium (Döll) A.Braun ex W.D.J.Koch — daisyleaf moonwort — 5 images — in Ophioglossaceae

Botrypus virginianus (L.) Michx. — rattlesnake fern — 13 images — in Ophioglossaceae

Bouteloua curtipendula var. curtipendula (Michx.) Torrey — sideoats grama — 16 images — in Poaceae

Brachyelytrum aristosum (Michx.) Trel. — northern long-awned woodgrass — 15 images — in Poaceae

Brachyelytrum erectum (Schreb. ex Spreng.) Beauv. — southern long-awned woodgrass, bearded shorthusk — 5 images — in Poaceae

Brasenia schreberi J.F.Gmelin — watershield — 42 images — in Cabombaceae

Brassica juncea (L.) Czern. — brown mustard, Oriental mustard, Chinese mustard — 3 images — in Brassicaceae

Brassica rapa L. — rape, field mustard, turnip — 7 images — in Brassicaceae

Bromus arvensis L. — field chess, field brome — 3 images — in Poaceae

Bromus commutatus Schrad. — hairy chess, meadow brome — 3 images — in Poaceae

Bromus hordeaceus ssp. hordeaceus L. — soft brome, soft chess — 5 images — in Poaceae

Bromus inermis ssp. inermis Leyss. — awnless brome, smooth brome — 12 images — in Poaceae

Bromus pubescens Muhl. ex Willd. — woodland brome, Canada brome, hairy wood brome — 6 images — in Poaceae

Bromus sterilis L. — barren brome — 4 images — in Poaceae

Bromus tectorum L. — drooping brome, downy chess — 10 images — in Poaceae

Broussonetia papyrifera (L.) L'Hér. ex Vent. — paper mullberry — 1 images — in Moraceae

Buddleja davidii Franch. — butterfly bush, summer lilac — 26 images — in Scrophulariaceae

Bulbostylis capillaris (L.) Kunth ex C.B.Clarke — tufted hairsedge, sandsedge — 28 images — in Cyperaceae

Buxus sempervirens L. — European common box, European boxwood — 4 images — in Buxaceae

Cabomba caroliniana A.Gray — Carolina fanwort — 50 images — in Cabombaceae

Cakile edentula ssp. edentula var. edentula (Bigelow) Hooker — American sea rocket — 22 images — in Brassicaceae

Calamagrostis canadensis var. canadensis (Michx.) Beauv. — Canada bluejoint, Canada reedgrass — 50 images — in Poaceae

Calamagrostis canadensis var. langsdorffii (Link) Inman — Langsdorff's bluejoint, Langsdorff's reedgrass — 4 images — in Poaceae

Calamagrostis cinnoides (Muhl.) W.Barton — Nuttall's bluejoint, reed bluejoint, Nuttall's reedgrass — 22 images — in Poaceae

Calamagrostis epigeios var. georgica (K.Koch) Ledeb. — feathertop, bushgrass — 28 images — in Poaceae

Calamagrostis pickeringii A.Gray — Pickering's reedgrass — 23 images — in Poaceae

Calendula officinalis L. — pot marigold — 1 images — in Asteraceae

Calla palustris L. — water arum, wild calla — 19 images — in Araceae

Callicarpa japonica Thunb. — Japanese callicarpa — 10 images — in Verbenaceae

Callitriche heterophylla var. heterophylla Pursh — greater water starwort, two-headed water starwort, variable water starwort — 41 images — in Plantaginaceae

Callitriche palustris L. — spring water starwort, vernal water starwort, narrow-fruited water starwort, spiny water starwort — 3 images — in Plantaginaceae

Callitriche stagnalis Scop. — pond water starwort, common European water starwort — 36 images — in Plantaginaceae

Calluna vulgaris (L.) Hull — Scotch heather — 24 images — in Ericaceae

Calopogon tuberosus var. tuberosus (L.) B.S.P. — tuberous grasspink — 14 images — in Orchidaceae

Caltha palustris L. — marsh marigold — 16 images — in Ranunculaceae

Calycanthus floridus var. glaucus (Willd.) Torrey & A.Gray — sweetshrub — 12 images — in Calycanthaceae

Calystegia sepium ssp. americana (Sims) Brummitt — American false bindweed — 11 images — in Convolvulaceae

Calystegia sepium ssp. sepium (L.) R.Br. — European false bindweed — 10 images — in Convolvulaceae

Campanula glomerata L. — clustered bellflower — 2 images — in Campanulaceae

Campanula persicifolia L. — peach-leaved bellflower — 6 images — in Campanulaceae

Campanula rapunculoides L. — rampion bellflower, creeping bellflower — 13 images — in Campanulaceae

Campanula rotundifolia L. — harebell, bluebell, Scotch bellflower — 1 images — in Campanulaceae

Campsis radicans (L.) Seem. ex Bureau — trumpet creeper — 17 images — in Bignoniaceae

Cannabis sativa L. — hemp, marijuana — 2 images — in Cannabaceae

Capnoides sempervirens (L.) Borkh. — rock harlequin, pale corydalis, pink corydalis — 28 images — in Papaveraceae

Capsella bursa-pastoris (L.) Medik. — shepherd's purse — 22 images — in Brassicaceae

Cardamine bulbosa (Schreb. ex Muhl.) B.S.P. — bulbous bittercress, spring cress — 7 images — in Brassicaceae

Cardamine concatenata (Michx.) Sw. — cut-leaved toothwort, five-parted toothwort — 6 images — in Brassicaceae

Cardamine diphylla (Michx.) Wood — crinkleroot, two-leaved toothwort — 23 images — in Brassicaceae

Cardamine hirsuta L. — hoary bittercress, hairy rockcress — 44 images — in Brassicaceae

Cardamine impatiens L. — narrowleaf bittercress, bushy rockcress — 19 images — in Brassicaceae

Cardamine longii Fern. — Long's bittercress — 2 images — in Brassicaceae

Cardamine maxima (Nutt.) Wood — large toothwort, three-leaved toothwort — 9 images — in Brassicaceae

Cardamine occulta Hornem. — hidden bittercress, nursery bittercress — 31 images — in Brassicaceae

Cardamine parviflora var. arenicola (Britton) O.E.Schulz — sand small-flowered bittercress — 24 images — in Brassicaceae

Cardamine pensylvanica Muhl. ex Willd. — common bittercress, Pennsylvania bittercress — 27 images — in Brassicaceae

Cardamine pratensis L. — pink cuckoo bittercress, pink cuckoo flower — 22 images — in Brassicaceae

Carduus nutans L. — nodding thistle, nodding plumeless thistle, musk thistle — 28 images — in Asteraceae

Carex abscondita Mackenzie — concealed sedge, thicket sedge — 3 images — in Cyperaceae

Carex albicans var. emmonsii (Dewey ex Torrey) J.Rettig — Emmons' sedge — 10 images — in Cyperaceae

Carex albursina Sheldon — white bear sedge — 1 images — in Cyperaceae

Carex annectens (Bickn.) Bickn. — yellow-fruited sedge — 18 images — in Cyperaceae

Carex appalachica J.Webber & P.W.Ball — Appalachian sedge, spreading star sedge — 6 images — in Cyperaceae

Carex arctata Boott ex Hooker — northern wood sedge, drooping woodland sedge — 3 images — in Cyperaceae

Carex argyrantha Tuckerman — silvery sedge, silvery-flowered sedge — 10 images — in Cyperaceae

Carex atlantica ssp. capillacea (L.H.Bailey) Reznicek — threadstem sedge, Howe's prickly sedge — 10 images — in Cyperaceae

Carex billingsii (Knight) C.D.Kirschbaum — three-seeded bog sedge, Billings' sedge — 6 images — in Cyperaceae

Carex blanda Dewey — eastern woodland sedge — 13 images — in Cyperaceae

Carex brevior (Dewey) Mack. ex Lunell — short-beaked sedge, short fescue sedge — 11 images — in Cyperaceae

Carex bromoides Schkuhr ex Willd. — brome-like sedge — 6 images — in Cyperaceae

Carex brunnescens var. sphaerostachya (Tuckerman) Kükenth. — brownish sedge — 7 images — in Cyperaceae

Carex bullata Schkuhr ex Willd. — button sedge — 27 images — in Cyperaceae

Carex buxbaumii Wahlenb. — Buxbaum's sedge, brown bog sedge — 6 images — in Cyperaceae

Carex canescens ssp. disjuncta (Fern.) Toivonen — southern silvery bog sedge — 23 images — in Cyperaceae

Carex caryophyllea Lat. — vernal sedge — 14 images — in Cyperaceae

Carex cephalophora Muhl. ex Willd. — oval-headed sedge — 16 images — in Cyperaceae

Carex communis var. communis Bailey — fibrous-rooted sedge, colonial sedge — 2 images — in Cyperaceae

Carex comosa Boott — bristly sedge, bearded sedge — 33 images — in Cyperaceae

Carex conoidea Schkuhr ex Willd. — open-field sedge — 5 images — in Cyperaceae

Carex crawfordii Fernald — Crawford's sedge — 8 images — in Cyperaceae

Carex crinita var. crinita Lam. — fringed sedge, awned sedge — 21 images — in Cyperaceae

Carex cumulata (Bailey) Mackenzie — clustered sedge, crowded sedge — 12 images — in Cyperaceae

Carex debilis var. rudgei L.H.Bailey — northern stalked sedge, Rudge's stalked sedge — 9 images — in Cyperaceae

Carex deweyana var. deweyana Schwein. — round-fruited short-scaled sedge — 7 images — in Cyperaceae

Carex digitalis var. digitalis Willd. — slender wood sedge, slender-spiked woodland sedge — 5 images — in Cyperaceae

Carex echinata ssp. echinata Murray — prickly sedge, star sedge — 3 images — in Cyperaceae

Carex flava L. — yellow sedge, yellow-green sedge — 7 images — in Cyperaceae

Carex folliculata L. — northern long sedge, long-culmed sedge — 21 images — in Cyperaceae

Carex gracillima Schwein. — slender drooping sedge, graceful sedge — 2 images — in Cyperaceae

Carex granularis Muhl. ex Willd. — limestone meadow sedge — 3 images — in Cyperaceae

Carex gynandra Schwein. — northern awned sedge, nodding sedge — 8 images — in Cyperaceae

Carex haydenii Dewey — Hayden's sedge — 15 images — in Cyperaceae

Carex hirta L. — hairy sedge, hammer sedge — 5 images — in Cyperaceae

Carex hormathodes Fernald — saltmarsh straw sedge — 17 images — in Cyperaceae

Carex intumescens Rudge — greater bladder sedge, swamp sedge — 19 images — in Cyperaceae

Carex lacustris Willd. — marsh sedge, lakeside sedge — 14 images — in Cyperaceae

Carex laevivaginata (Kükenth.) Mackenzie — smooth-sheathed sedge — 4 images — in Cyperaceae

Carex lasiocarpa ssp. americana (Fern.) D.Löve & Bernard — slender woolly fruited sedge — 29 images — in Cyperaceae

Carex laxiculmis var. laxiculmis Schwein. — spreading woodland sedge, spreading sedge — 11 images — in Cyperaceae

Carex laxiflora Lam. — loosely flowered woodland sedge, broad loosely flowered sedge — 27 images — in Cyperaceae

Carex leptalea ssp. leptalea Wahlenb. — delicate sedge, bristle-stalk sedge — 4 images — in Cyperaceae

Carex leptonervia (Fern.) Fern. — faint-nerved woodland sedge, fine-nerved woodland sedge — 8 images — in Cyperaceae

Carex limosa L. — mud sedge — 5 images — in Cyperaceae

Carex longii Mackenzie — Long's sedge — 36 images — in Cyperaceae

Carex lucorum ssp. lucorum Willd. ex Link — long-beaked Pennsylvania sedge, Blue Ridge sedge — 16 images — in Cyperaceae

Carex lupuliformis Sartwell ex Dewey — false hop sedge — 2 images — in Cyperaceae

Carex lupulina Muhl. ex Willd. — hop sedge — 21 images — in Cyperaceae

Carex lurida Wahlenb. — sallow sedge — 35 images — in Cyperaceae

Carex mackenziei Krecz. — Mackenzie's sedge — 7 images — in Cyperaceae

Carex muehlenbergii var. muehlenbergii Schkuhr ex Willd. — Muhlenberg's sedge — 3 images — in Cyperaceae

Carex nigra (L.) Reichard — smooth black sedge — 6 images — in Cyperaceae

Carex normalis Mackenzie — big straw sedge, greater straw sedge — 4 images — in Cyperaceae

Carex novae-angliae Schwein. — New England sedge — 2 images — in Cyperaceae

Carex oligosperma Michx. — fewseeded sedge — 13 images — in Cyperaceae

Carex paleacea Schreber ex Wahlenb. — saltmarsh sedge, chaffy sedge — 7 images — in Cyperaceae

Carex pallescens L. — pale sedge — 19 images — in Cyperaceae

Carex panicea L. — millet sedge, grass-like sedge — 11 images — in Cyperaceae

Carex pedunculata ssp. pedunculata Muhl. ex Willd. — long-stalked sedge — 7 images — in Cyperaceae

Carex pellita Muhl. — broad-leaved woolly fruited sedge, woolly sedge — 9 images — in Cyperaceae

Carex pensylvanica Lam. — Pennsylvania sedge — 27 images — in Cyperaceae

Carex plantaginea Lam. — plantain-leaved sedge — 7 images — in Cyperaceae

Carex platyphylla Carey — broad-leaved sedge, broad-leaved woodland sedge — 3 images — in Cyperaceae

Carex polymorpha Muhl. — variable sedge — 8 images — in Cyperaceae

Carex praegracilis W.Boott — freeway sedge — 10 images — in Cyperaceae

Carex prasina Wahlenb. — twisted drooping sedge — 7 images — in Cyperaceae

Carex projecta Mackenzie — beaded broom sedge, necklace broom sedge — 8 images — in Cyperaceae

Carex pseudocyperus L. — galingale sedge, flatsedge-like sedge, false flatsedge — 13 images — in Cyperaceae

Carex radiata (Wahlenb.) Small — eastern star sedge — 9 images — in Cyperaceae

Carex retroflexa Muhl. ex Willd. — reflexed sedge — 7 images — in Cyperaceae

Carex rosea Schkuhr ex Willd. — rosy sedge, big star sedge — 11 images — in Cyperaceae

Carex scoparia var. scoparia Schkuhr ex Willd — pointed broom sedge — 19 images — in Cyperaceae

Carex siccata Dewey — dryland sedge — 6 images — in Cyperaceae

Carex silicea Olney — seabeach sedge — 26 images — in Cyperaceae

Carex spicata Hudson — European star sedge, prickly sedge — 9 images — in Cyperaceae

Carex stipata var. stipata Muhl. ex Willd. — awl-fruited sedge — 17 images — in Cyperaceae

Carex straminea Willd. ex Schkuhr — straw sedge, eastern straw sedge — 14 images — in Cyperaceae

Carex striata Michx. — Walter's sedge — 19 images — in Cyperaceae

Carex stricta Lam. — tussock sedge — 21 images — in Cyperaceae

Carex stricta var. strictior (Dewey) Carey — stiff sedge — 19 images — in Cyperaceae

Carex swanii (Fern.) Mackenzie — Swan's sedge — 27 images — in Cyperaceae

Carex tenera Dewey — slender straw sedge, delicate quill sedge — 8 images — in Cyperaceae

Carex tonsa var. rugosperma (Mackenzie) W.J.Crins — hairy sand sedge, hairy shaved sedge — 6 images — in Cyperaceae

Carex tonsa var. tonsa (Fern.) Bickn. — stiff-leaved sand sedge, shaved sedge — 26 images — in Cyperaceae

Carex torta Boott ex Tuckerman — twisted sedge, riverside sedge — 9 images — in Cyperaceae

Carex tribuloides Wahlenb. — blunt broom sedge — 20 images — in Cyperaceae

Carex trisperma Dewey — three-seeded bog sedge — 16 images — in Cyperaceae

Carex typhina Michx. — cattail sedge — 4 images — in Cyperaceae

Carex umbellata Schkuhr ex Willd. non Fern. — parasol sedge, short-beaked sand sedge — 8 images — in Cyperaceae

Carex utriculata Boott — bottle sedge, beaked sedge, swollen-beaked sedge — 29 images — in Cyperaceae

Carex vesicaria L. — lesser bladder sedge, inflated sedge — 7 images — in Cyperaceae

Carex vestita Willd. — velvet-fruited sedge — 29 images — in Cyperaceae

Carex virescens Muhl. ex Willd. — ribbed sedge — 18 images — in Cyperaceae

Carex vulpinoidea Michx. — common fox sedge — 21 images — in Cyperaceae

Carpinus caroliniana ssp. virginiana (Marsh.) Furlow — American hornbeam, ironwood, musclewood, bluebeech — 26 images — in Betulaceae

Carya cordiformis (Wangenh.) K.Koch — bitternut hickory, swamp hickory — 13 images — in Juglandaceae

Carya glabra (P.Miller) Sweet — pignut hickory — 30 images — in Juglandaceae

Carya ovalis (Wangenh.) Sarg. — sweet pignut hickory, red hickory — 4 images — in Juglandaceae

Carya ovata (P.Miller) K.Koch — shagbark hickory — 31 images — in Juglandaceae

Carya tomentosa (Lam. ex Poiret) Nutt. — mockernut hickory — 27 images — in Juglandaceae

Castanea dentata (Marsh.) Borkh. — American chestnut — 60 images — in Fagaceae

Castanea mollissima Blume — Chinese chestnut — 9 images — in Fagaceae

Castanea pumila (L.) P.Miller — dwarf chestnut, chinquapin — 13 images — in Fagaceae

Castilleja occidentalis Torr. — western Indian paintbrush — 2 images — in Orobanchaceae

Castilleja rhexifolia Rydb. — rosy Indian paintbrush — 1 images — in Orobanchaceae

Catalpa bignonioides Walter — southern catalpa, Indian bean tree — 16 images — in Bignoniaceae

Catalpa ovata G.Don — yellow catalpa, Chinese catalpa — 6 images — in Bignoniaceae

Catalpa speciosa (Warder) Warder ex Engelm. — northern catalpa, western catalpa, cigar tree — 8 images — in Bignoniaceae

Caulophyllum giganteum (Farw.) Loconte & W.H.Blackw. — early blue cohosh — 9 images — in Berberidaceae

Caulophyllum thalictroides (L.) Michx. — late blue cohosh — 14 images — in Berberidaceae

Ceanothus americanus L. — New Jersey tea — 20 images — in Rhamnaceae

Cedrus libani A.Rich. — cedar of Lebanon — 2 images — in Pinaceae

Celastrus orbiculatus Thunb. — Oriental bittersweet, Asian bittersweet — 92 images — in Celastraceae

Celastrus orbiculatus × C. scandens — hybrid bittersweet — 5 images — in Celastraceae

Celastrus scandens L. — American bittersweet — 3 images — in Celastraceae

Celosia cristata L. — cockscomb — 9 images — in Amaranthaceae

Celtis occidentalis L. — common hackberry — 40 images — in Cannabaceae

Cenchrus spinifex Cav. — coastal sandbur — 10 images — in Poaceae

Centaurea cyanus L. — garden knapweed, cornflower, bachelor's button — 3 images — in Asteraceae

Centaurea jacea L. — brown knapweed — 2 images — in Asteraceae

Centaurea montana L. — mountain knapweed — 2 images — in Asteraceae

Centaurea nigra L. — black knapweed — 3 images — in Asteraceae

Centaurea nigrescens Willd. — Tyrol knapweed, Vochin knapweed, Wocheiner knapweed, short-fringed knapweed — 7 images — in Asteraceae

Centaurea phrygia L. — wig knapweed — 8 images — in Asteraceae

Centaurea stoebe ssp. micranthos (S.G.Gmelin ex Gugler) Hayek — spotted knapweed, bushy knapweed — 94 images — in Asteraceae

Centaurea ×moncktonii C.E.Britton — Monckton's knapweed — 34 images — in Asteraceae

Centaurium erythraea Raf. — European centaury, lesser centaury — 1 images — in Gentianaceae

Centaurium pulchellum (Sw.) Druce — branching centaury, branched centaury — 4 images — in Gentianaceae

Cephalanthus occidentalis L. — common buttonbush — 30 images — in Rubiaceae

Cerastium fontanum ssp. vulgare (Hartman) Greuter & Burdet — mouse-ear chickweed — 41 images — in Caryophyllaceae

Cerastium glomeratum Thuill. — clammy chickweed, sticky chickweed — 9 images — in Caryophyllaceae

Cerastium pumilum ssp. pumilum W.Curtis — dwarf chickweed, European chickweed — 7 images — in Caryophyllaceae

Cerastium semidecandrum L. — five-stamen chickweed — 23 images — in Caryophyllaceae

Cerastium strictum L. — American field chickweed — 1 images — in Caryophyllaceae

Cerastium tomentosum L. — tomentose chickweed, snow-in-summer — 8 images — in Caryophyllaceae

Ceratophyllum demersum L. — hornwort, coontail — 15 images — in Ceratophyllaceae

Ceratophyllum echinatum A.Gray — forked coontail — 5 images — in Ceratophyllaceae

Cercidiphyllum japonicum Zieb. & Zucc. — katsura tree — 26 images — in Cercidiphyllaceae

Cercis canadensis var. canadensis L. — redbud — 15 images — in Fabaceae

Chaenomeles speciosa (Sweet) Nakai — Japanese flowering quince — 16 images — in Rosaceae

Chamaecrista fasciculata (Michx.) Greene — common partridge pea — 20 images — in Fabaceae

Chamaecrista nictitans ssp. nictitans var. nictitans (L.) Moench — sensitive partridge pea — 8 images — in Fabaceae

Chamaecyparis thyoides (L.) B.S.P. — Atlantic white cedar — 85 images — in Cupressaceae

Chamaedaphne calyculata (L.) Moench — leatherleaf, cassandra — 54 images — in Ericaceae

Chamaenerion angustifolium (L.) Scop. — American great willowherb, American fireweed — 9 images — in Onagraceae

Chamaepericlymenum canadense (L.) Aschers. & Graebn. — bunchberry, dwarf cornel — 21 images — in Cornaceae

Chasmanthium latifolium (Michx.) Yates — flat-head oats, upland oats, river oats — 5 images — in Poaceae

Chelidonium majus L. — greater celandine — 16 images — in Papaveraceae

Chelone glabra L. — white turtlehead — 26 images — in Plantaginaceae

Chelone lyonii Pursh — pink turtlehead, Lyon's turtlehead — 5 images — in Plantaginaceae

Chelone obliqua var. obliqua L. — red turtlehead — 5 images — in Plantaginaceae

Chenopodium album L. — white goosefoot, lamb's quarters — 31 images — in Amaranthaceae

Chenopodium berlandieri var. macrocalycium (Aellen) Cronq. — large-calyx goosefoot — 35 images — in Amaranthaceae

Chenopodium glaucum ssp. glaucum L. — oakleaf goosefoot — 3 images — in Amaranthaceae

Chenopodium polyspermum var. polyspermum L. — many-seeded goosefoot — 8 images — in Amaranthaceae

Chenopodium rubrum var. rubrum L. — coast blite, red goosefoot — 14 images — in Amaranthaceae

Chenopodium simplex (Torrey) Raf. — mapleleaf goosefoot, giant-seeded goosefoot — 7 images — in Amaranthaceae

Chenopodium strictum ssp. glaucophyllum (Aellen) Aellen & Just. — oval-seeded goosefoot, glaucous pigweed — 4 images — in Amaranthaceae

Chenopodium urbicum L. — city goosefoot — 5 images — in Amaranthaceae

Chimaphila maculata (L.) Pursh — striped pipsissewa, spotted wintergreen — 22 images — in Ericaceae

Chimaphila umbellata ssp. cisatlantica (Blake) Hultén — pipsissewa — 9 images — in Ericaceae

Chionanthus virginicus L. — white fringetree, Virginia fringetree — 14 images — in Oleaceae

Chionodoxa forbesii Baker — Forbes' glory-of-the-snow — 11 images — in Asphodelaceae

Chionodoxa luciliae Boiss. — Lucilia's glory-of-the-snow — 16 images — in Asphodelaceae

Chosenia arbutifolia (Pallas) A.Skv. — chosenia — 3 images — in Salicaceae

Chrysanthemum ×morifolium Ramat. — florist's daisy, florist's chrysanthemum, hardy garden mum — 4 images — in Asteraceae

Chrysogonum virginianum L. — goldenstar, green-and-gold — 7 images — in Asteraceae

Chrysosplenium americanum Schwein. ex Hooker — golden saxifrage, watercarpet — 22 images — in Saxifragaceae

Cichorium intybus L. — common chicory — 13 images — in Asteraceae

Cicuta bulbifera L. — bulblet-bearing water hemlock — 19 images — in Apiaceae

Cicuta maculata var. maculata L. — spotted water hemlock — 24 images — in Apiaceae

Cinna arundinacea L. — common woodreed, sweet woodreed — 18 images — in Poaceae

Circaea alpina ssp. alpina L. — small enchanter's nightshade — 2 images — in Onagraceae

Circaea canadensis ssp. canadensis (L.) Hill — broad-leaved enchanter's nightshade — 22 images — in Onagraceae

Cirsium arvense (L.) Scop. — Canada thistle, creeping thistle — 13 images — in Asteraceae

Cirsium discolor (Muhl. ex Willd.) Sprengel — field thistle — 3 images — in Asteraceae

Cirsium horridulum var. horridulum Michx. — yellow thistle — 19 images — in Asteraceae

Cirsium pumilum var. pumilum (Nutt.) Sprengel — pasture thistle — 17 images — in Asteraceae

Cirsium scariosum Nutt. — meadow thistle, elk thistle, dwarf thistle — 1 images — in Asteraceae

Cirsium vulgare (Savi) Ten. — common thistle, bull thistle — 38 images — in Asteraceae

Citrullus lanatus (Thunb.) Matsumura & Nakai — watermelon — 2 images — in Cucurbitaceae

Cladium mariscoides (Muhl.) Torrey — smooth sawsedge, twigsedge — 32 images — in Cyperaceae

Cladrastis kentukea (Dum.Cours.) Rudd — yellowwood — 14 images — in Fabaceae

Claytonia caroliniana Michx. — broad-leaved springbeauty — 26 images — in Montiaceae

Claytonia virginica L. — narrow-leaved springbeauty — 16 images — in Montiaceae

Clematis terniflora DC. — yamleaf virginsbower — 22 images — in Ranunculaceae

Clematis virginiana L. — virginsbower — 16 images — in Ranunculaceae

Clethra alnifolia L. — sweet pepperbush — 45 images — in Clethraceae

Clinopodium cf. menthifolium (Host) Stace — calamint — 9 images — in Lamiaceae

Clinopodium vulgare L. — wild basil — 23 images — in Lamiaceae

Clintonia borealis (Aiton) Raf. — bluebead lily — 44 images — in Liliaceae

Colchicum autumnale L. — autumn crocus — 6 images — in Colchicaceae

Coleataenia longifolia ssp. rigidula (Bosc ex Nees) Soreng — flat-stemmed panicgrass — 17 images — in Poaceae

Collinsonia canadensis L. — northern horsebalm, stoneroot — 4 images — in Lamiaceae

Collomia linearis Nutt. — tiny trumpet, narrow-leaved mountain trumpet — 4 images — in Polemoniaceae

Colutea arborescens L. — bladder senna — 3 images — in Fabaceae

Comandra umbellata ssp. umbellata (L.) Nutt. — bastard toadflax — 32 images — in Santalaceae

Comarum palustre L. — marsh cinquefoil — 12 images — in Rosaceae

Commelina communis L. — dayflower — 4 images — in Commelinaceae

Comptonia peregrina (L.) Coulter — sweetfern — 28 images — in Myricaceae

Conium maculatum L. — poison hemlock — 20 images — in Apiaceae

Conoclinium coelestinum (L.) DC. — blue mistflower — 6 images — in Asteraceae

Conopholis americana (L.) Wallr.f. — American squaw-root, American cancer-root — 14 images — in Orobanchaceae

Convallaria majalis L. — lily-of-the-valley — 34 images — in Ruscaceae

Convolvulus arvensis L. — field bindweed — 9 images — in Convolvulaceae

Coptis trifolia (L.) Salisb. — threeleaf goldthread — 32 images — in Ranunculaceae

Corallorhiza trifida Chatelain — pale coralroot, early coralroot — 4 images — in Orchidaceae

Corema conradii (Torrey) Torrey ex Loudon — broom crowberry — 49 images — in Ericaceae

Coreopsis lanceolata L. — lanceleaf tickseed — 32 images — in Asteraceae

Coreopsis rosea Nutt. — pink tickseed — 41 images — in Asteraceae

Cornus mas L. — cornel, cornelian cherry — 6 images — in Cornaceae

Corydalis solida (L.) Clairv. — purple corydalis, spring corydalis — 3 images — in Papaveraceae

Corylus americana Walt. — American hazelnut — 33 images — in Betulaceae

Corylus colurna L. — Turkish hazel, filbert — 11 images — in Betulaceae

Corylus cornuta ssp. cornuta Marsh. — beaked hazelnut — 28 images — in Betulaceae

Cosmos bipinnatus Cav. — garden cosmos, Mexican aster — 3 images — in Asteraceae

Cotinus coggygria Scop. — Eurasian smoketree — 3 images — in Anacardiaceae

Cotinus obovatus Raf. — American smoketree — 5 images — in Anacardiaceae

Cotinus ×'Grace' — hybrid smoketree — 11 images — in Anacardiaceae

Cotoneaster divaricatus Rehd. & E.H.Wilson — spreading cotoneaster — 17 images — in Rosaceae

Cotoneaster salicifolius Franch. — willowleaf cotoneaster — 4 images — in Rosaceae

Crataegus brainerdii Sarg. — Brainerd's hawthorn — 11 images — in Rosaceae

Crataegus crus-galli L. — cockspur hawthorn — 12 images — in Rosaceae

Crataegus fretalis Sarg. — Long Island Sound hawthorn — 7 images — in Rosaceae

Crataegus macracantha var. macracantha Lodd. ex Loud. — largethorn hawthorn — 3 images — in Rosaceae

Crataegus macrosperma Ashe — largeseed hawthorn — 18 images — in Rosaceae

Crataegus monogyna Jacq. — English hawthorn — 10 images — in Rosaceae

Crataegus phaenopyrum (L.f.) Medik. — Washington hawthorn — 5 images — in Rosaceae

Crataegus pringlei Sarg. — Pringle's hawthorn — 7 images — in Rosaceae

Crataegus pruinosa var. pruinosa (Wendl.f.) K.Koch — frosted hawthorn — 4 images — in Rosaceae

Crataegus submollis Sarg. — downy hawthorn, Quebec hawthorn — 9 images — in Rosaceae

Crataegus succulenta var. succulenta Schrader ex Link — fleshy hawthorn — 8 images — in Rosaceae

Crepis capillaris (L.) Wallr. — smooth hawk's beard — 7 images — in Asteraceae

Crocanthemum bicknellii (Fern.) Barnh. — hoary frostweed, hoary rockrose — 30 images — in Cistaceae

Crocanthemum canadense (L.) Britton — longbranch frostweed, Canada frostweed — 52 images — in Cistaceae

Crocanthemum dumosum Bicknell — bushy frostweed, bushy rockrose — 26 images — in Cistaceae

Crocanthemum propinquum (Bicknell) Bicknell — low frostweed, low rockrose — 32 images — in Cistaceae

Crocus albiflorus Kit. ex Schult. — white crocus — 4 images — in Iridaceae

Crocus ancyrensis (Herb.) Maw — Ankara crocus — 9 images — in Iridaceae

Crocus chrysanthus (Herb.) Herb. — snow crocus, golden crocus — 4 images — in Iridaceae

Crocus sativus L. — saffron crocus, autumn crocus — 4 images — in Iridaceae

Crocus sieberi J.Gay — Sieber's crocus, Cretan crocus — 3 images — in Iridaceae

Crocus speciosus M.Bieb. — Bieberstein's crocus, large autumn crocus — 4 images — in Iridaceae

Crocus tommasinianus Herb. — woodland crocus, early or snow crocus — 11 images — in Iridaceae

Crocus vernus ssp. vernus (L.) Hill — spring crocus — 18 images — in Iridaceae

Crocus ×stellaris — starflowered crocus — 3 images — in Iridaceae

Crotalaria sagittalis L. — arrowhead rattlebox — 21 images — in Fabaceae

Cryptogramma acrostichoides R.Br. — American parsley fern, American rockbrake — 3 images — in Pteridaceae

Cryptotaenia canadensis (L.) DC. — American honewort, Canada honewort — 5 images — in Apiaceae

Cryptotaenia japonica Hassk. — Japanese honewort — 4 images — in Apiaceae

Cucumis sativus L. — garden cucumber — 1 images — in Cucurbitaceae

Cucurbita pepo L. — pumpkin — 1 images — in Cucurbitaceae

Cuscuta campestris Yuncker — field dodder, prairie dodder — 27 images — in Convolvulaceae

Cuscuta cephalanthi Engelm. — buttonbush dodder — 11 images — in Convolvulaceae

Cuscuta compacta var. compacta Juss. ex Choisy — dense dodder, compact dodder — 8 images — in Convolvulaceae

Cuscuta coryli Engelm. — pondshore dodder, hazel dodder — 21 images — in Convolvulaceae

Cuscuta gronovii var. gronovii Willd. ex J.A.Schult. — common dodder, swamp dodder, strangleweed, love vine — 19 images — in Convolvulaceae

Cuscuta pentagona Engelm. — five-angled dodder, bushclover dodder — 19 images — in Convolvulaceae

Cydonia oblonga P.Miller — common quince — 3 images — in Rosaceae

Cymbalaria muralis Gaertner, Meyer & Scherb. — Kenilworth ivy, Oxford ivy, Coliseum ivy — 15 images — in Plantaginaceae

Cynodon dactylon var. dactylon (L.) Pers. — Bermuda grass — 4 images — in Poaceae

Cynoglossum officinale L. — common European hound's tongue — 6 images — in Boraginaceae

Cyperus bipartitus Torrey — shining flatsedge — 12 images — in Cyperaceae

Cyperus dentatus Torrey — pondshore flatsedge, toothed flatsedge — 27 images — in Cyperaceae

Cyperus diandrus Torrey — umbrella flatsedge, red-edged flatsedge — 13 images — in Cyperaceae

Cyperus engelmannii Steudel — Engelmann's flatsedge — 13 images — in Cyperaceae

Cyperus erythrorhizos Muhl. — redroot flatsedge — 8 images — in Cyperaceae

Cyperus esculentus var. leptostachyus Boeck. — yellow flatsedge, nut flatsedge — 14 images — in Cyperaceae

Cyperus filicinus Vahl — fern flatsedge — 5 images — in Cyperaceae

Cyperus grayi Torrey — Gray's flatsedge — 32 images — in Cyperaceae

Cyperus lupulinus var. macilentus (Fern.) A.Haines — slender sand flatsedge, depauperated Great Plains flatsedge — 15 images — in Cyperaceae

Cyperus microiria Steudel — golden flatsedge, lesser ricefield flatsedge — 10 images — in Cyperaceae

Cyperus polystachyos Rottb. — many-spiked flatsedge, Texas flatsedge — 7 images — in Cyperaceae

Cyperus strigosus L. — straw-colored flatsedge — 40 images — in Cyperaceae

Cypripedium acaule Aiton — pink lady's slipper — 17 images — in Orchidaceae

Cystopteris bulbifera (L.) Bernh. — bulbil fragile fern, bulblet bladder fern — 10 images — in Woodsiaceae

Cystopteris fragilis (L.) Bernh. — fragile fern, brittle bladder fern — 10 images — in Woodsiaceae

Cystopteris tenuis (Michx.) Desv. — Mackay's fragile fern, Mackay's brittle fern, upland brittle bladder fern — 5 images — in Woodsiaceae

Cytisus scoparius var. scoparius (L.) Link — Scotch broom — 20 images — in Fabaceae

Dactylis glomerata L. — orchard grass — 7 images — in Poaceae

Dalibarda repens L. — dewdrop, Dalibard's dewberry — 15 images — in Rosaceae

Danthonia compressa Austin ex Peck — flattened oatgrass, trail oatgrass, woodland oatgrass — 25 images — in Poaceae

Danthonia spicata (L.) Beauv. ex Roemer & J.A.Schultes — poverty oatgrass — 10 images — in Poaceae

Daphne mezereum L. — February daphne, mezereon, mezereum — 4 images — in Thymelaeaceae

Dasiphora floribunda Raf. — shrubby cinquefoil — 13 images — in Rosaceae

Datura stramonium L. — white thornapple, jimsonweed, Jamestown weed — 42 images — in Solanaceae

Daucus carota L. — wild carrot, Queen Anne's lace — 16 images — in Apiaceae

Decodon verticillatus (L.) Ell. — swamp loosestrife, waterwillow — 51 images — in Lythraceae

Delosperma cooperi (Hook.f.) L.Bolus — Cooper's hardy iceplant, trailing iceplant — 17 images — in Aizoaceae

Dendrolycopodium dendroideum (Michx.) A.Haines — northern clubmoss, round-branched groundpine — 5 images — in Lycopodiaceae

Dendrolycopodium hickeyi (W.H.Wagner, Beitel & Moran) A.Haines — Hickey's clubmoss — 7 images — in Lycopodiaceae

Dendrolycopodium obscurum (L.) A.Haines — princess-pine, groundpine, tree clubmoss — 25 images — in Lycopodiaceae

Dennstaedtia punctilobula (Michx.) T.Moore — hayscented fern — 60 images — in Dennstaedtiaceae

Deparia acrostichoides (Sw.) M.Kato — silvery spleenwort — 23 images — in Woodsiaceae

Deschampsia flexuosa (L.) Trin. — wavy hairgrass, crinkled hairgrass — 15 images — in Poaceae

Desmodium canadense (L.) DC. — showy ticktrefoil, Canadian ticktrefoil — 22 images — in Fabaceae

Desmodium ciliare (Muhl. ex Willd.) DC. ex Loud. — hairy small-leaved ticktrefoil — 11 images — in Fabaceae

Desmodium marilandicum (L.) DC. — smooth small-leaved ticktrefoil — 25 images — in Fabaceae

Desmodium paniculatum (L.) DC. — panicled ticktrefoil — 11 images — in Fabaceae

Desmodium perplexum Schubert — perplexing ticktrefoil, puzzling ticktrefoil, Dillen's ticktrefoil — 7 images — in Fabaceae

Desmodium rotundifolium DC. — prostrate ticktrefoil, round-leaved trailing ticktrefoil — 10 images — in Fabaceae

Desmodium ×humifusum (Muhl. ex Bigelow) Beck — spreading ticktrefoil — 3 images — in Fabaceae

Deutzia gracilis Sieb. & Zucc. — slender deutzia — 4 images — in Hydrangeaceae

Deutzia scabra Thunb. — fuzzy deutzia — 26 images — in Hydrangeaceae

Dianthus armeria L. — Deptford pink, grass pink — 13 images — in Caryophyllaceae

Dianthus barbatus L. — sweet William — 8 images — in Caryophyllaceae

Dianthus deltoides L. — maiden pink — 4 images — in Caryophyllaceae

Dicentra canadensis (Goldie) Walp. — squirrel corn — 16 images — in Papaveraceae

Dicentra cucullaria (L.) Bernh. — Dutchman's breeches — 8 images — in Papaveraceae

Dicentra eximia (Ker Gawl.) Torrey — fringed bleeding heart, eastern bleeding heart, Appalachian bleeding heart, turkey corn — 2 images — in Papaveraceae

Dicentra formosa ssp. formosa (Andr.) Walp. — western bleeding heart, Pacific bleeding heart — 3 images — in Papaveraceae

Dichanthelium acuminatum (Sw.) Gould & C.A.Clark — auburn panicgrass, tapered panicgrass — 7 images — in Poaceae

Dichanthelium clandestinum (L.) Gould — deertongue panicgrass — 19 images — in Poaceae

Dichanthelium columbianum (Scribn.) Freckmann — downy panicgrass — 8 images — in Poaceae

Dichanthelium commutatum ssp. ashei (G.Pearson ex Ashe) Freckmann & Lelong — Ashe's panicgrass, variable panicgrass — 6 images — in Poaceae

Dichanthelium depauperatum (Muhl.) Gould — starved panicgrass, slender panicgrass — 3 images — in Poaceae

Dichanthelium dichotomum ssp. dichotomum (L.) Gould — forked panicgrass — 11 images — in Poaceae

Dichanthelium implicatum (Scribn.) Kerg. — pondshore panicgrass — 8 images — in Poaceae

Dichanthelium lanuginosum (Ell.) Gould — fascicled panicgrass — 19 images — in Poaceae

Dichanthelium latifolium (L.) Gould & Glark — broad-leaved panicgrass — 26 images — in Poaceae

Dichanthelium linearifolium (Scribn.) Gould — linear-leaved panicgrass — 11 images — in Poaceae

Dichanthelium oligosanthes ssp. scribnerianum (Nash) Freckmann & Lelong — Scribner's panicgrass — 9 images — in Poaceae

Dichanthelium sphaerocarpon (Ell.) Gould — round-fruited panicgrass — 10 images — in Poaceae

Dichanthelium spretum (J.A.Schultes) Freckmann — smooth panicgrass — 4 images — in Poaceae

Dichanthelium wrightianum (Scribn.) Freckmann — Wright's panicgrass — 2 images — in Poaceae

Diervilla lonicera P.Miller — northern bush honeysuckle — 20 images — in Caprifoliaceae

Diervilla rivularis Gattinger — hairy bush honeysuckle — 9 images — in Caprifoliaceae

Digitalis grandiflora P.Mill. — yellow foxglove — 3 images — in Plantaginaceae

Digitalis lanata Ehrh. — woolly foxglove, Grecian foxglove — 2 images — in Plantaginaceae

Digitalis lutea L. — straw foxglove, small yellow foxglove — 5 images — in Plantaginaceae

Digitalis purpurea var. purpurea L. — common foxglove, purple foxglove — 39 images — in Plantaginaceae

Digitaria ischaemum (Schreb.) Schreb. ex Muhl. — smooth crabgrass — 9 images — in Poaceae

Digitaria sanguinalis (L.) Scop. — hairy crabgrass, large crabgrass — 30 images — in Poaceae

Digitaria violascens Link — violet crabgrass — 15 images — in Poaceae

Diodia teres var. teres Walter — rough buttonweed — 18 images — in Rubiaceae

Diospyros virginiana L. — American persimmon — 36 images — in Ebenaceae

Diphasiastrum digitatum (Dill. ex A.Br.) Holub — southern groundcedar — 26 images — in Lycopodiaceae

Diphasiastrum tristachyum (Pursh) Holub — slender groundcedar, wiry groundcedar — 6 images — in Lycopodiaceae

Diplotaxis tenuifolia (L.) DC. — perennial wallrocket, cutleaf wallrocket — 8 images — in Brassicaceae

Dipsacus fullonum L. — fuller's teasel, common teasel — 3 images — in Caprifoliaceae

Dipsacus laciniatus L. — cutleaf teasel — 19 images — in Caprifoliaceae

Dirca palustris L. — eastern leatherwood — 14 images — in Thymelaeaceae

Distichlis spicata (L.) Greene — saltgrass, saltmarsh spikegrass — 16 images — in Poaceae

Doellingeria umbellata var. umbellata (P.Mill.) Nees — tall flat-topped white aster — 37 images — in Asteraceae

Doronicum pardalianches L. — great leopard's bane, greater false leopard's bane — 18 images — in Asteraceae

Draba verna L. — spring whitlowgrass, spring whitlowmustard, longpod whitlowgrass — 43 images — in Brassicaceae

Drosera filiformis var. filiformis Raf. — threadleaf sundew — 42 images — in Droseraceae

Drosera intermedia Hayne — spoonleaf sundew, spatulate-leaved sundew — 22 images — in Droseraceae

Drosera rotundifolia L. — roundleaf sundew — 28 images — in Droseraceae

Drosera ×eloisiana T.S.Bailey — hybrid sundew — 14 images — in Droseraceae

Drymocallis arguta (Pursh) Rydb. — tall cinquefoil, glandular cinquefoil — 11 images — in Rosaceae

Dryopteris carthusiana (Vill.) H.P.Fuchs — spinulose wood fern — 40 images — in Dryopteridaceae

Dryopteris clintoniana (D.C.Eaton ex A.Gray) Dowell — Clinton's wood fern — 6 images — in Dryopteridaceae

Dryopteris cristata (L.) A.Gray — crested wood fern — 34 images — in Dryopteridaceae

Dryopteris intermedia (Muhl. ex Willd.) A.Gray — intermediate wood fern — 47 images — in Dryopteridaceae

Dryopteris marginalis (L.) A.Gray — marginal wood fern — 50 images — in Dryopteridaceae

Dryopteris ×boottii (Tuckerman) Underw. — Boott's wood fern — 14 images — in Dryopteridaceae

Dryopteris ×slossoniae Wherry ex Lellinger — Slosson's wood fern — 11 images — in Dryopteridaceae

Dulichium arundinaceum (L.) Britton — threeway sedge — 21 images — in Cyperaceae

Dysphania ambrosioides (L.) Mosyakin & Clemants — Mexican tea — 17 images — in Amaranthaceae

Dysphania pumilio (R.Br.) Mosyakin & Clemants — ridged goosefoot, pygmy goosefoot — 9 images — in Amaranthaceae

Echinacea pallida (Nutt.) Nutt. — pale purple coneflower, prairie coneflower — 2 images — in Asteraceae

Echinacea purpurea (L.) Moench — purple coneflower — 10 images — in Asteraceae

Echinochloa crus-galli (L.) Beauv. — common barnyard grass — 22 images — in Poaceae

Echinochloa frumentacea Link — Japanese millet — 18 images — in Poaceae

Echinochloa muricata var. microstachya Wieg. — small-spiked American barnyard grass, small-spiked cockspur — 6 images — in Poaceae

Echinochloa muricata var. muricata (Beauv.) Fern. — American barnyard grass, common cockspur — 3 images — in Poaceae

Echinochloa walteri (Pursh) Heller — coastal barnyard grass, Walter's cockspur — 14 images — in Poaceae

Echinocystis lobata (Michx.) Torrey & A.Gray — wild cucumber, prickly cucumber — 13 images — in Cucurbitaceae

Echinops sphaerocephalus L. — great globethistle, pale globethistle — 8 images — in Asteraceae

Echium creticum L. — Cretan viper's bugloss — 13 images — in Boraginaceae

Echium vulgare L. — common viper's bugloss, blue weed — 4 images — in Boraginaceae

Eclipta prostrata (L.) L. — false daisy — 7 images — in Asteraceae

Egeria densa Planchon — Brazilian waterweed, Brazilian elodea — 14 images — in Hydrocharitaceae

Eichhornia crassipes (Mart.) Solms-Laubach — common water hyacinth — 1 images — in Pontederiaceae

Elaeagnus angustifolia L. — Russian olive, oleaster, silverberry — 13 images — in Elaeagnaceae

Elaeagnus umbellata var. parvifolia (Royle) Schneid. — autumn olive, autumn oleaster, spreading oleaster — 54 images — in Elaeagnaceae

Elatine minima (Nutt.) Fisch. & C.A.Mey. — lesser waterwort — 37 images — in Elatinaceae

Eleocharis acicularis (L.) Roemer & Schultes — needle spikerush, needle spikesedge — 37 images — in Cyperaceae

Eleocharis elliptica var. elliptica Kunth — orange-fruited spikerush, elliptic spikesedge — 21 images — in Cyperaceae

Eleocharis flavescens var. olivacea (Torrey) Gleason — olive spikerush, yellow spikesedge — 29 images — in Cyperaceae

Eleocharis melanocarpa Torrey — black-fruited spikerush, black-fruited spikesedge — 46 images — in Cyperaceae

Eleocharis obtusa var. ellipsoidalis Fern. — ellipsoid softstem spikerush — 10 images — in Cyperaceae

Eleocharis obtusa var. jejuna var. ellipsoidalis obtusa Eleocharis Fern. — slender softstem spikerush, starved softstem spikerush — 2 images — in Cyperaceae

Eleocharis obtusa var. obtusa (Willd.) J.A.Schultes — softstem spikerush, blunt spikesedge — 54 images — in Cyperaceae

Eleocharis palustris (L.) Roemer & Schultes — Small's spikerush, marsh spikerush, common spikesedge — 20 images — in Cyperaceae

Eleocharis parvula (Roemer & Schultes) Link ex Bluff, Nees & Schauer — dwarf spikerush, small-headed spikesedge — 7 images — in Cyperaceae

Eleocharis robbinsii Oakes — Robbins' spikerush, Robbins' spikesedge — 62 images — in Cyperaceae

Eleocharis rostellata (Torrey) Torrey — saltmarsh spikerush, beaked spikesedge — 20 images — in Cyperaceae

Eleocharis tenuis var. tenuis (Willd.) Schultes — slender spikerush, slender spikesedge — 17 images — in Cyperaceae

Eleocharis tuberculosa (Michx.) Roemer & Schultes — tubercled spikerush, long-tubercled spikesedge — 15 images — in Cyperaceae

Eleocharis uniglumis (Link) Schultes — saline spikerush, one-glumed spikesedge — 21 images — in Cyperaceae

Eleusine indica (L.) Gaertner — Indian goosegrass, Indian yardgrass — 18 images — in Poaceae

Eleutherococcus pentaphyllus (Sieb. & Zucc.) Nakai — five-leaved aralia — 8 images — in Araliaceae

Elodea canadensis Michx. — northern waterweed, common waterweed — 5 images — in Hydrocharitaceae

Elodea nuttallii (Planchon) H.St.John — Nuttall's waterweed, free-flowered waterweed — 10 images — in Hydrocharitaceae

Elymus canadensis var. canadensis L. — Canada wild rye — 5 images — in Poaceae

Elymus hystrix L. — eastern bottlebrush grass — 16 images — in Poaceae

Elymus repens (L.) Gould — quackgrass, couchgrass, creeping wild rye — 6 images — in Poaceae

Elymus riparius Wieg. — eastern riverbank wild rye — 5 images — in Poaceae

Elymus trachycaulus ssp. glaucus (Pease & Moore) Cody — glaucous slender wheatgrass — 3 images — in Poaceae

Elymus virginicus var. halophilus (Bicknell) Wieg. — saltmarsh eastern wild rye — 18 images — in Poaceae

Elymus virginicus var. virginicus L. — Virginia wild rye, common eastern wild rye — 17 images — in Poaceae

Epifagus virginiana (L.) W.P.C.Barton — beechdrops — 31 images — in Orobanchaceae

Epigaea repens L. — trailing arbutus, mayflower — 50 images — in Ericaceae

Epilobium ciliatum var. ciliatum Raf. — glandular willowherb, fringed willowherb, American willowherb — 33 images — in Onagraceae

Epilobium coloratum Biehler — eastern willowherb, purple-leaved willowherb, cinnamon willowherb — 3 images — in Onagraceae

Epilobium hirsutum L. — hairy willowherb — 4 images — in Onagraceae

Epilobium leptophyllum Raf. — narrow-leaved willowherb, bog willowherb — 4 images — in Onagraceae

Epilobium palustre L. — marsh willowherb — 3 images — in Onagraceae

Epilobium strictum Muhl. ex Spreng. — downy willowherb, northeastern willowherb — 5 images — in Onagraceae

Epimedium ×rubrum C.Morren — red barrenwort, red bishop's hat — 6 images — in Berberidaceae

Epipactis helleborine (L.) Crantz — broad-leaved helleborine — 35 images — in Orchidaceae

Equisetum arvense L. — field horsetail, common horsetail — 34 images — in Equisetaceae

Equisetum fluviatile L. — river horsetail — 23 images — in Equisetaceae

Equisetum hyemale ssp. affine (Engelm.) Calder & Taylor — American tall scouring rush — 27 images — in Equisetaceae

Equisetum sylvaticum L. — woodland horsetail — 10 images — in Equisetaceae

Equisetum variegatum ssp. variegatum Schleicher ex Weber & Mohr — variegated scouring rush — 5 images — in Equisetaceae

Equisetum ×litorale Kühl. ex Rupr. — shore horsetail — 7 images — in Equisetaceae

Eragrostis capillaris (L.) Nees — lace lovegrass, lace grass — 4 images — in Poaceae

Eragrostis cilianensis (All.) Lut. ex Janchen — stinking lovegrass, stink grass — 12 images — in Poaceae

Eragrostis curvula (Schrader) Nees — weeping lovegrass — 16 images — in Poaceae

Eragrostis pectinacea var. pectinacea (Michx.) Nees ex Steud. — tufted lovegrass — 24 images — in Poaceae

Eragrostis pilosa var. pilosa (L.) Beauv. — Indian lovegrass, soft lovegrass — 16 images — in Poaceae

Eragrostis spectabilis (Pursh) Steudel — showy lovegrass, purple lovegrass — 18 images — in Poaceae

Eranthis hyemalis (L.) Salisb. — winter aconite — 11 images — in Ranunculaceae

Erechtites hieraciifolius var. hieraciifolius (L.) Raf. ex DC. — fireweed, pilewort — 31 images — in Asteraceae

Erica carnea L. — winter heath, spring heath — 4 images — in Ericaceae

Erica ×darleyensis Bean — Mediterranean white heath, Darley Dale heath — 3 images — in Ericaceae

Erigeron annuus (L.) Pers. — annual fleabane, eastern daisy fleabane — 15 images — in Asteraceae

Erigeron canadensis (L.) Carr. — Canada fleabane, horseweed, hogweed, butterweed — 39 images — in Asteraceae

Erigeron philadelphicus var. philadelphicus L. — Philadelphia fleabane — 4 images — in Asteraceae

Erigeron pulchellus var. pulchellus Michx. — robin's plantain fleabane — 11 images — in Asteraceae

Erigeron speciosus Eastw. — aspen fleabane, garden fleabane, showy fleabane — 3 images — in Asteraceae

Erigeron strigosus var. strigosus Muhl. ex Willd. — rough fleabane, lesser daisy fleabane — 14 images — in Asteraceae

Eriocaulon aquaticum (Hill) Druce — seven-angled pipewort, white buttons — 44 images — in Eriocaulaceae

Eriocaulon parkeri B.L.Robinson — Parker's pipewort — 8 images — in Eriocaulaceae

Eriophorum tenellum Nutt. — rough cottongrass, few-nerved cottonsedge — 2 images — in Cyperaceae

Eriophorum virginicum L. — Virginia cottongrass, tawny cottonsedge — 36 images — in Cyperaceae

Erodium cicutarium ssp. cicutarium (L.) L'Hér. ex Aiton — redstem storksbill, redstem filaree, alfileria — 8 images — in Geraniaceae

Eruca vesicaria ssp. sativa (Mill.) Hegi — garden rocket — 2 images — in Brassicaceae

Eryngium planum L. — broad-leaved eryngo, Plains eryngo — 9 images — in Apiaceae

Eryngium yuccifolium var. yuccifolium Michx. — button eryngo — 5 images — in Apiaceae

Erysimum capitatum (Dougl. ex Hook.) Greene — sand dune wallflower — 3 images — in Brassicaceae

Erysimum cheiranthoides L. — wormseed wallflower, wormseed mustard — 15 images — in Brassicaceae

Erysimum ×marshalli (Henfr.) Bois. — Siberian wallflower (garden hybrid, parentage uncertain) — 4 images — in Brassicaceae

Erythronium americanum ssp. americanum Ker Gawler — American trout lily — 46 images — in Liliaceae

Eschscholzia californica Cham. ex Nees — California poppy — 1 images — in Papaveraceae

Eubotrys racemosa (L.) Nutt. — swamp sweetbells — 54 images — in Ericaceae

Eubotrys recurva (Buckley) Britton — mountain fetterbush — 15 images — in Ericaceae

Euonymus alatus (Thunb.) Sieb. — winged spindletree, Oriental spindletree — 37 images — in Celastraceae

Euonymus europaeus L. — European spindletree — 28 images — in Celastraceae

Euonymus fortunei (Turcz.) Hand.-Mazz. — winter creeper — 33 images — in Celastraceae

Euonymus sachalinensis (Fr.Schmidt) Maxim. — Sakhalin spindletree — 14 images — in Celastraceae

Euonymus sieboldianus Blume — Siebold's euonymus — 7 images — in Celastraceae

Eupatorium altissimum L. — tall boneset — 7 images — in Asteraceae

Eupatorium hyssopifolium L. — hyssop-leaved boneset — 23 images — in Asteraceae

Eupatorium novae-angliae (Fern.) V.Sullivan ex A.Haines & Sorrie — New England boneset, pondshore boneset — 8 images — in Asteraceae

Eupatorium perfoliatum L. — common boneset, boneset thoroughwort — 49 images — in Asteraceae

Eupatorium pilosum Walter — rough boneset, verbena boneset — 36 images — in Asteraceae

Eupatorium pubescens Muhl. ex Willd. — hairy boneset — 7 images — in Asteraceae

Eupatorium serotinum Michx. — late boneset — 7 images — in Asteraceae

Eupatorium sessilifolium L. — upland boneset — 5 images — in Asteraceae

Eupatorium torreyanum Short & Peter — Torrey's thoroughwort — 5 images — in Asteraceae

Euphorbia cf. peplus — spurge — 6 images — in Euphorbiaceae

Euphorbia corollata L. — flowering spurge — 7 images — in Euphorbiaceae

Euphorbia cyparissias L. — cypress spurge — 22 images — in Euphorbiaceae

Euphorbia lathyris L. — caper spurge, gopher spurge — 10 images — in Euphorbiaceae

Euphorbia maculata L. — spotted spurge, spotted sandmat, milk purslane — 25 images — in Euphorbiaceae

Euphorbia marginata Pursh — mountain snow spurge, snow-on-the-mountain — 4 images — in Euphorbiaceae

Euphorbia nutans Lag. — eyebane sandmat — 5 images — in Euphorbiaceae

Euphorbia polygonifolia L. — seaside spurge, seaside sandmat — 17 images — in Euphorbiaceae

Euphorbia virgata Waldst. & Kit. — slender leafy spurge — 13 images — in Euphorbiaceae

Eurybia divaricata (L.) G.L.Nesom — white wood aster — 15 images — in Asteraceae

Eurybia macrophylla (L.) Cass. — large-leaved aster — 25 images — in Asteraceae

Eurybia radula (Aiton) G.L.Nesom — rough aster — 13 images — in Asteraceae

Eurybia schreberi (Nees) Nees — Schreber's aster — 7 images — in Asteraceae

Eurybia spectabilis (Aiton) G.L.Nesom — showy aster — 52 images — in Asteraceae

Euthamia caroliniana (L.) Greene ex Port. & Britt. — Coastal Plain slender goldenrod, slender-leaved flat-topped goldenrod — 26 images — in Asteraceae

Euthamia graminifolia (L.) Nutt. — common flat-topped goldenrod, grassleaf flat-topped goldenrod — 16 images — in Asteraceae

Eutrochium dubium (Willd. ex Poir.) E.E.Lamont — Atlantic Joe-Pye-weed — 30 images — in Asteraceae

Eutrochium fistulosum (Barratt) E.E.Lamont — hollow-stemmed Joe-Pye-weed — 31 images — in Asteraceae

Eutrochium maculatum var. maculatum (L.) E.E.Lamont — spotted Joe-Pye-weed — 9 images — in Asteraceae

Eutrochium purpureum var. purpureum (L.) E.E.Lamont — sweet Joe-Pye-weed — 13 images — in Asteraceae

Fagopyrum esculentum Moench — garden buckwheat — 12 images — in Polygonaceae

Fagus grandifolia Ehrh. — American beech — 81 images — in Fagaceae

Fagus sylvatica L. — European beech — 25 images — in Fagaceae

Fallopia cilinodis (Michx.) Holub — fringed bindweed — 8 images — in Polygonaceae

Fallopia convolvulus (L.) A.Löve — black bindweed, false buckwheat — 7 images — in Polygonaceae

Fallopia cristata (Engelm. & A.Gray) Holub — winged bindweed, crested bindweed — 10 images — in Polygonaceae

Fallopia scandens (L.) Holub — climbing false buckwheat, bindweed — 26 images — in Polygonaceae

Festuca filiformis Pourret — hair fescue, fine-leaved sheep fescue — 9 images — in Poaceae

Festuca trachyphylla (Hack.) Krajina — hard fescue — 17 images — in Poaceae

Ficaria verna ssp. bulbifer A.Löve & D.Löve — lesser celandine, pilewort, fig crowfoot — 24 images — in Ranunculaceae

Ficus carica L. — common fig — 3 images — in Moraceae

Filipendula rubra (Hill) B.L.Robins. — prairie dropwort, queen-of-the-prairie — 3 images — in Rosaceae

Fimbristylis autumnalis (L.) Roemer & Schultes — northern fimbry, autumn fimbry, slender fimbry — 24 images — in Cyperaceae

Foeniculum vulgare P.Miller — common fennel, sweet fennel — 6 images — in Apiaceae

Forsythia intermedia Zabel — border forsythia — 22 images — in Oleaceae

Forsythia suspensa (Thunb.) Vahl — weeping forsythia, golden bell — 13 images — in Oleaceae

Forsythia viridissima Lindl. — greenstem forsythia, Korean forsythia — 9 images — in Oleaceae

Fragaria vesca ssp. americana (Porter) Staudt — woodland strawberry — 9 images — in Rosaceae

Fragaria vesca ssp. vesca L. — European strawberry — 3 images — in Rosaceae

Fragaria virginiana ssp. virginiana Duchesne — thick-leaved wild strawberry — 24 images — in Rosaceae

Fragaria ×ananassa (Weston) Duchesne ex Rozier — garden strawberry — 3 images — in Rosaceae

Frangula alnus P.Miller — glossy buckthorn — 37 images — in Rhamnaceae

Fraxinus americana L. — white ash — 72 images — in Oleaceae

Fraxinus excelsior L. — common European ash — 6 images — in Oleaceae

Fraxinus nigra Marshall — black ash — 21 images — in Oleaceae

Fraxinus pennsylvanica Marshall — green ash — 59 images — in Oleaceae

Froelichia gracilis (Hooker) Moq. — slender cottonweed — 25 images — in Amaranthaceae

Fuirena pumila (Torrey) Sprengel — annual umbrella sedge, dwarf umbrella sedge — 32 images — in Cyperaceae

Fumaria officinalis ssp. officinalis L. — common fumitory, medicinal fumitory, earth smoke — 5 images — in Papaveraceae

Gaillardia pulchella Foug. — rosering blanket-flower, annual gaillardia — 3 images — in Asteraceae

Galanthus elwesii Hook.f. — greater snowdrop — 8 images — in Amaryllidaceae

Galanthus nivalis ssp. nivalis L. — snowdrop — 8 images — in Amaryllidaceae

Galanthus woronowii Losinsk. — green snowdrop, Woronow's snowdrop — 8 images — in Amaryllidaceae

Galax urceolata (Poiret) Brummitt — beetleweed, wandflower — 17 images — in Diapensiaceae

Galeopsis bifida Boenn. — cleft hempnettle, split-lipped hempnettle — 13 images — in Lamiaceae

Galinsoga parviflora Cav. — lesser quickweed, gallant soldiers — 2 images — in Asteraceae

Galinsoga quadriradiata Ruiz & Pavón — common quickweed, hairy quickweed — 13 images — in Asteraceae

Galium album L. — upright white bedstraw — 2 images — in Rubiaceae

Galium aparine L. — scratch bedstraw, cleavers — 12 images — in Rubiaceae

Galium asprellum Michx. — rough bedstraw — 6 images — in Rubiaceae

Galium circaezans var. circaezans Michx. — wild licorice, forest bedstraw — 12 images — in Rubiaceae

Galium circaezans var. hypomalacum Fern. — hairy wild licorice, hairy forest bedstraw — 8 images — in Rubiaceae

Galium divaricatum Pourret ex Lam. — Lamarck's bedstraw, Mediterranean bedstraw — 10 images — in Rubiaceae

Galium lanceolatum Torrey — wild licorice, lanceleaf bedstraw — 14 images — in Rubiaceae

Galium mollugo L. — whorled white bedstraw, field madder — 26 images — in Rubiaceae

Galium obtusum ssp. obtusum Bigelow — blunt-leaved marsh bedstraw, large marsh bedstraw — 4 images — in Rubiaceae

Galium odoratum (L.) Scop. — sweet white woodruff — 11 images — in Rubiaceae

Galium palustre L. — common marsh bedstraw — 4 images — in Rubiaceae

Galium pilosum var. pilosum Aiton — hairy bedstraw — 29 images — in Rubiaceae

Galium tinctorium var. tinctorium (L.) Scop. — stiff marsh bedstraw, stiff three-petaled bedstraw — 35 images — in Rubiaceae

Galium trifidum ssp. trifidum L. — tricleft bedstraw, northern three-lobed bedstraw — 7 images — in Rubiaceae

Galium triflorum Michx. — fragrant bedstraw, sweet-scented bedstraw — 16 images — in Rubiaceae

Galium verum ssp. verum L. — yellow bedstraw — 6 images — in Rubiaceae

Gaultheria hispidula (L.) Muhl. ex Bigelow — creeping snowberry — 16 images — in Ericaceae

Gaultheria procumbens L. — wintergreen, checkerberry, eastern teaberry — 48 images — in Ericaceae

Gaylussacia baccata (Wangenh.) K.Koch — black huckleberry — 55 images — in Ericaceae

Gaylussacia bigeloviana (Fern.) Sorrie & Weakley — bog huckleberry — 25 images — in Ericaceae

Gaylussacia frondosa (L.) Torr. & A.Gray ex Torr. — blue huckleberry, dangleberry — 43 images — in Ericaceae

Genista tinctoria L. — dyer's greenweed — 3 images — in Fabaceae

Gentiana andrewsii var. andrewsii Griseb. — Andrews' bottle gentian, prairie bottle gentian — 26 images — in Gentianaceae

Gentiana clausa Raf. — meadow bottle gentian — 11 images — in Gentianaceae

Gentianopsis crinita (Froel.) Y.C.Ma — greater fringed gentian — 11 images — in Gentianaceae

Geranium carolinianum L. — Carolina cranesbill, Carolina geranium — 31 images — in Geraniaceae

Geranium maculatum L. — spotted cranesbill, wild geranium, wood geranium — 26 images — in Geraniaceae

Geranium pratense L. — meadow cranesbill, meadow geranium — 2 images — in Geraniaceae

Geranium robertianum L. — mountain cranesbill, Robert's geranium, herb-Robert — 23 images — in Geraniaceae

Geranium sanguineum L. — bloody cranesbill, blood-red cranesbill, bloody geranium — 15 images — in Geraniaceae

Geranium thunbergii Sieb. & Zucc. ex Lindl. & Paxton — Japanese cranesbill, dewdrop cranesbill, Thunberg's geranium — 18 images — in Geraniaceae

Geum canadense var. canadense Jacq. — white avens — 47 images — in Rosaceae

Geum laciniatum Murray — rough avens, floodplain avens, herb-bennet avens — 7 images — in Rosaceae

Geum rivale L. — purple avens, water avens — 8 images — in Rosaceae

Geum urbanum L. — wood avens, city avens, town avens — 9 images — in Rosaceae

Geum virginianum L. — cream-colored avens, Virginia avens — 1 images — in Rosaceae

Glaucium flavum Crantz — yellow hornpoppy, sea poppy — 18 images — in Papaveraceae

Glechoma hederacea L. — ground ivy, gill-over-the-ground — 21 images — in Lamiaceae

Gleditsia triacanthos L. — honey locust — 21 images — in Fabaceae

Glyceria acutiflora Torrey — sharp-scaled mannagrass — 10 images — in Poaceae

Glyceria canadensis (Michaux) Trin. — rattlesnake mannagrass, rattlesnake grass — 13 images — in Poaceae

Glyceria grandis var. grandis S.Watson — tall mannagrass — 2 images — in Poaceae

Glyceria obtusa (Muhl.) Trin. — Atlantic mannagrass, coastal mannagrass — 19 images — in Poaceae

Glyceria septentrionalis var. septentrionalis A.S.Hitchc — floating mannagrass, eastern floatgrass — 13 images — in Poaceae

Glyceria striata (Lam.) A.S.Hitchc. — fowlmeadow grass, fowl mannagrass — 12 images — in Poaceae

Gnaphalium uliginosum L. — low cudweed, brown cudweed — 9 images — in Asteraceae

Goodyera pubescens (Willd.) R.Br. — downy rattlesnake plantain — 18 images — in Orchidaceae

Goodyera tesselata Lodd. — checkered rattlesnake plantain — 18 images — in Orchidaceae

Gratiola aurea Pursh — golden hedgehyssop, golden pert — 43 images — in Plantaginaceae

Gratiola aurea f. leucantha Bartlett — white-flowered golden hedgehyssop — 24 images — in Plantaginaceae

Gratiola neglecta Torrey — mud hedgehyssop, clammy hedgehyssop — 5 images — in Plantaginaceae

Gymnocarpium dryopteris (L.) Newman — northern oak fern — 5 images — in Woodsiaceae

Gypsophila muralis L. — low baby's breath, cushion baby's breath — 7 images — in Caryophyllaceae

Halesia carolina L. — Carolina silverbell — 20 images — in Styracaceae

Hamamelis vernalis Sarg. — Ozark witch-hazel, spring witch-hazel — 15 images — in Hamamelidaceae

Hamamelis virginiana L. — American witch-hazel, common witch-hazel — 47 images — in Hamamelidaceae

Hedeoma pulegioides (L.) Pers. — American false pennyroyal — 7 images — in Lamiaceae

Hedera colchica K.Koch — Caucasian ivy — 5 images — in Araliaceae

Hedera helix L. — English ivy, European ivy — 24 images — in Araliaceae

Hedera hibernica (G.Kirchn.) Bean — Atlantic ivy — 19 images — in Araliaceae

Helenium autumnale L. — common sneezeweed — 6 images — in Asteraceae

Helenium flexuosum Raf. — purple-headed sneezeweed, winged sneezeweed — 24 images — in Asteraceae

Helianthella uniflora (Nutt.) Torr. & A.Gray — oneflower helianthella — 5 images — in Asteraceae

Helianthus annuus L. — common sunflower, mirasol — 5 images — in Asteraceae

Helianthus decapetalus L. — thin-leaved sunflower — 4 images — in Asteraceae

Helianthus divaricatus L. — woodland sunflower, rough woodland sunflower — 18 images — in Asteraceae

Helianthus giganteus L. — tall sunflower, giant sunflower — 7 images — in Asteraceae

Helianthus strumosus L. — harsh sunflower, pale-leaved sunflower — 10 images — in Asteraceae

Helianthus tuberosus L. — Jerusalem artichoke, tuberous sunflower — 23 images — in Asteraceae

Heliopsis helianthoides var. scabra (Dunal) Fern. — rough oxeye, rough false sunflower — 18 images — in Asteraceae

Helleborus niger L. — Christmas rose — 7 images — in Ranunculaceae

Helleborus viridis L. — green hellebore — 4 images — in Ranunculaceae

Helleborus ×hybridus hort. ex Vilmorin — Lenten hellebore, Lenten rose — 4 images — in Ranunculaceae

Hemerocallis fulva (L.) L. — orange daylily — 30 images — in Asphodelaceae

Hemerocallis lilioasphodelus L. — yellow daylily — 1 images — in Asphodelaceae

Hepatica acutiloba DC. — sharp-lobed liverleaf, sharp-lobed liverwort — 18 images — in Ranunculaceae

Hepatica americana (DC.) Ker Gawler — blunt-lobed liverleaf, blunt-lobed liverwort — 30 images — in Ranunculaceae

Heracleum maximum Bartram — cow parsnip — 42 images — in Apiaceae

Heracleum sosnowskyi Manden. — Sosnowsky's giant hogweed — 5 images — in Apiaceae

Herniaria hirsuta var. hirsuta L. — hairy rupturewort — 5 images — in Caryophyllaceae

Herrickia glauca (Nutt.) Brouillet — Gray’s aster — 2 images — in Asteraceae

Hesperis matronalis L. — dame's rocket, dame's violet, Damask violet — 24 images — in Brassicaceae

Heterotheca villosa (Pursh) Shinners — hairy goldenaster — 2 images — in Asteraceae

Hexastylis arifolia (Michx.) Small — little brown jug — 7 images — in Aristolochiaceae

Hexastylis shuttleworthii (Britten & Baker f.) Small — largeflower heartleaf — 22 images — in Aristolochiaceae

Hibiscus moscheutos ssp. moscheutos L. — swamp mallow, swamp rose mallow — 27 images — in Malvaceae

Hibiscus syriacus L. — shrubby rose mallow, Korean hibiscus, rose-of-Sharon — 6 images — in Malvaceae

Hibiscus trionum L. — Venice rose mallow, flower-of-an-hour — 2 images — in Malvaceae

Hieracium gronovii L. — Gronovius' hawkweed — 20 images — in Asteraceae

Hieracium kalmii L. — Canada hawkweed — 9 images — in Asteraceae

Hieracium lachenalii K.C.Gmelin — European common hawkweed — 7 images — in Asteraceae

Hieracium paniculatum L. — woodland hawkweed, panicled hawkweed — 15 images — in Asteraceae

Hieracium sabaudum L. — Savoy hawkweed — 31 images — in Asteraceae

Hieracium scabrum Michx. — rough hawkweed — 31 images — in Asteraceae

Hieracium venosum var. nudicaule (Michx.) Farv. — rattlesnake hawkweed, rattlesnake weed — 13 images — in Asteraceae

Holcus lanatus L. — common velvetgrass — 26 images — in Poaceae

Holodiscus dumosus (Nutt. ex Hook.) A.Heller — mountain spray, rock-spiraea — 3 images — in Rosaceae

Holosteum umbellatum ssp. umbellatum L. — jagged chickweed — 20 images — in Caryophyllaceae

Honckenya peploides ssp. robusta (Fern.) Hultén — seabeach sandwort — 25 images — in Caryophyllaceae

Hordeum vulgare L. — common barley — 3 images — in Poaceae

Hosta lancifolia Tratt. — narrowleaf plantain lily — 3 images — in Asphodelaceae

Hosta ventricosa (Salisb.) Stearn — blue plantain lily — 6 images — in Asphodelaceae

Hottonia inflata Ell. — American featherfoil — 28 images — in Primulaceae

Houstonia caerulea L. — little bluet — 32 images — in Rubiaceae

Houstonia longifolia Gaertn. — long-leaved bluet — 17 images — in Rubiaceae

Hudsonia ericoides L. — pinebarren golden heather — 45 images — in Cistaceae

Hudsonia tomentosa Nutt. — woolly beach heather — 34 images — in Cistaceae

Humulus japonicus Sieb. & Zucc. — Japanese hops — 10 images — in Cannabaceae

Humulus lupulus ssp. lupulus L. — common European hops — 4 images — in Cannabaceae

Huperzia lucidula (Michx.) Trev. — shining firmoss, shining clubmoss — 14 images — in Lycopodiaceae

Hyacinthoides non-scripta (L.) Chouard — English bluebell — 5 images — in Asphodelaceae

Hyacinthoides ×variabilis Geerinck — hybrid bluebell — 12 images — in Asphodelaceae

Hydrangea anomala D.Don — climbing hydrangea — 8 images — in Hydrangeaceae

Hydrangea arborescens L. — smooth hydrangea, sevenbark — 3 images — in Hydrangeaceae

Hydrangea paniculata Sieb. — peegee hydrangea — 6 images — in Hydrangeaceae

Hydrangea quercifolia W.Bartram — oakleaf hydrangea — 3 images — in Hydrangeaceae

Hydrastis canadensis L. — golden seal — 13 images — in Ranunculaceae

Hydrocotyle americana L. — American marsh pennywort, swamp pennywort, woodland pennywort — 19 images — in Apiaceae

Hydrocotyle umbellata L. — many-flowered marsh pennywort, pondshore pennywort, water pennywort — 27 images — in Apiaceae

Hydrocotyle verticillata Thunb. — whorled marsh pennywort, saltpond pennywort — 3 images — in Apiaceae

Hydrophyllum virginianum L. — Virginia waterleaf, eastern waterleaf — 13 images — in Boraginaceae

Hylodesmum glutinosum (Muhl. ex Willd.) H.Ohashi & R.R.Mill — cluster-leaved ticktrefoil, pointed-leaf ticktrefoil — 9 images — in Fabaceae

Hylodesmum nudiflorum (L.) H.Ohashi & R.R.Mill — naked ticktrefoil, naked-flower ticktrefoil — 7 images — in Fabaceae

Hylotelephium spectabile (Boreau) H. Ohba — stonecrop — 2 images — in Crassulaceae

Hylotelephium telephium ssp. telephium (L.) H.Ohba — live-forever — 14 images — in Crassulaceae

Hypericum boreale (Britt.) Bickn. — northern St. John's-wort — 11 images — in Hypericaceae

Hypericum boreale f. callitrichoides Fassett — northern St. John's-wort submersed form — 9 images — in Hypericaceae

Hypericum canadense L. — lesser Canadian St. John's-wort — 14 images — in Hypericaceae

Hypericum ellipticum Hooker — pale St. John's-wort — 2 images — in Hypericaceae

Hypericum frondosum Michx. — cedar glade St. John's-wort, golden St. John's-wort — 1 images — in Hypericaceae

Hypericum gentianoides (L.) B.S.P. — orangegrass St. John's-wort, orange grass, pineweed — 25 images — in Hypericaceae

Hypericum majus (A.Gray) Britton — larger Canadian St. John's-wort — 3 images — in Hypericaceae

Hypericum mutilum L. — dwarf St. John's-wort — 3 images — in Hypericaceae

Hypericum perforatum L. — common Eurasian St. John's-wort — 22 images — in Hypericaceae

Hypericum prolificum L. — shrubby St. John's-wort — 4 images — in Hypericaceae

Hypericum punctatum Lam. — spotted St. John's-wort — 16 images — in Hypericaceae

Hypochaeris radicata L. — hairy cat's ear — 46 images — in Asteraceae

Hypopitys lanuginosa (Michx.) Nutt. — hairy pinesap — 18 images — in Ericaceae

Hypopitys monotropa Crantz — yellow pinesap, false beechdrops — 17 images — in Ericaceae

Hypoxis hirsuta (L.) Cov. — yellow stargrass, common stargrass — 22 images — in Hypoxidaceae

Iberis amara L. — rocket candytuft — 3 images — in Brassicaceae

Iberis sempervirens L. — evergreen candytuft — 4 images — in Brassicaceae

Ilex crenata Thunb. — Japanese holly — 14 images — in Aquifoliaceae

Ilex glabra (L.) A.Gray — inkberry, inkberry holly — 34 images — in Aquifoliaceae

Ilex laevigata (Pursh) A.Gray — smooth winterberry — 19 images — in Aquifoliaceae

Ilex montana Torrey & A.Gray ex A.Gray — bigleaf holly, mountain holly — 31 images — in Aquifoliaceae

Ilex mucronata (L.) M.Powell, Savol. & S.Andrews — catberry, mountain holly, swamp holly — 70 images — in Aquifoliaceae

Ilex opaca var. opaca Ait. — American holly — 62 images — in Aquifoliaceae

Ilex verticillata (L.) A.Gray — common winterberry — 55 images — in Aquifoliaceae

Ilex ×meserveae S.Y.Hu — Meserve's holly — 8 images — in Aquifoliaceae

Impatiens capensis Meerb. — orange jewelweed, common jewelweed, spotted touch-me-not — 28 images — in Balsaminaceae

Ionactis linariifolia (L.) Greene — flax-leaved stiff aster, spruce aster — 35 images — in Asteraceae

Ipomoea hederacea Jacq. — ivyleaf morning glory — 3 images — in Convolvulaceae

Ipomoea purpurea (L.) Roth — purple morning glory, common morning glory — 10 images — in Convolvulaceae

Iris cristata Aiton — crested dwarf iris — 1 images — in Iridaceae

Iris domestica (L.) Goldblatt & Mabberly — leopard flower, blackberry lily — 9 images — in Iridaceae

Iris germanica L. — German iris, fleur-de-lis — 5 images — in Iridaceae

Iris prismatica Pursh — slender blueflag — 30 images — in Iridaceae

Iris pseudacorus L. — yellow iris — 27 images — in Iridaceae

Iris sibirica L. — Siberian iris — 12 images — in Iridaceae

Iris versicolor L. — northern blueflag — 43 images — in Iridaceae

Isoetes acadiensis Kott — Acadian quillwort — 6 images — in Isoetaceae

Isoetes engelmannii? — quillwort (either E. engelmannii or E. ×foveolata) — 10 images — in Isoetaceae

Isoetes tuckermanii A.Br. ex Engelm. — Tuckerman's quillwort — 20 images — in Isoetaceae

Isotrema macrophyllum (Lam.) C.F.Reed — large-leaved Dutchman's pipe — 3 images — in Aristolochiaceae

Isotrema tomentosum (Sims) Huber — woolly pipevine, woolly Dutchman's pipe — 4 images — in Aristolochiaceae

Isotria verticillata (Muhl. ex Willd.) Raf. — large whorled pogonia — 11 images — in Orchidaceae

Itea virginica L. — Virginia sweetspire, Virginia willow — 4 images — in Iteaceae

Iva frutescens L. — maritime marsh elder, bigleaf marsh elder, saltmarsh elder, hightide bush — 23 images — in Asteraceae

Jacobaea maritima (L.) Pelser & Meijden — dusty miller, silver ragwort — 5 images — in Asteraceae

Jasione montana L. — sheep's bit — 43 images — in Campanulaceae

Jasminum nudiflorum Lindl. — winter jasmine — 1 images — in Oleaceae

Juglans ailantifolia Carr. — Japanese walnut — 4 images — in Juglandaceae

Juglans cinerea L. — butternut, white walnut — 11 images — in Juglandaceae

Juglans nigra L. — black walnut — 15 images — in Juglandaceae

Juncus acuminatus Michx. — sharp-fruited rush — 8 images — in Juncaceae

Juncus anthelatus (Wieg.) R.E.Brooks — Wiegand's rush — 8 images — in Juncaceae

Juncus articulatus L. — jointed rush, jointedleaf rush — 7 images — in Juncaceae

Juncus balticus ssp. littoralis (Engelm.) Snogerup — brackish Baltic rush — 3 images — in Juncaceae

Juncus bufonius L. — toad rush — 5 images — in Juncaceae

Juncus canadensis J.Gay ex Laharpe — marsh rush, Canada rush — 32 images — in Juncaceae

Juncus conglomeratus L. — compact rush — 5 images — in Juncaceae

Juncus dichotomus Ell. — forked rush — 6 images — in Juncaceae

Juncus effusus ssp. solutus (Fern. & Wieg.) Hämet-Ahti — lax soft rush — 13 images — in Juncaceae

Juncus gerardii Loisel. — saltmarsh rush — 22 images — in Juncaceae

Juncus greenei Oakes & Tuckerman — Greene's rush — 17 images — in Juncaceae

Juncus marginatus Rostk. — grassleaf rush — 12 images — in Juncaceae

Juncus militaris Bigelow — bayonet rush — 55 images — in Juncaceae

Juncus pelocarpus E.Meyer — pondshore rush, brown-fruited rush — 30 images — in Juncaceae

Juncus pylaei Laharpe — Pylaie's soft rush — 21 images — in Juncaceae

Juncus secundus Beauv. ex Poiret — lopsided rush — 5 images — in Juncaceae

Juncus subcaudatus (Engelm.) Coville — woodland rush — 5 images — in Juncaceae

Juncus tenuis Willd. — path rush, yard rush — 20 images — in Juncaceae

Juniperus communis var. depressa Pursh — common juniper, pasture juniper — 37 images — in Cupressaceae

Juniperus conferta Parl. — shore juniper — 29 images — in Cupressaceae

Juniperus horizontalis Moench — prostrate juniper, creeping juniper — 11 images — in Cupressaceae

Juniperus scopulorum Sarg. — Rocky Mountain juniper — 3 images — in Cupressaceae

Juniperus virginiana var. virginiana virginiana — eastern red cedar — 72 images — in Cupressaceae

Kalmia angustifolia var. angustifolia L. — sheep laurel — 49 images — in Ericaceae

Kalmia latifolia L. — mountain laurel — 63 images — in Ericaceae

Kalmia polifolia Wangenh. — bog laurel — 5 images — in Ericaceae

Kalopanax septemlobus (Thunb.) Koidz. — castor aralia — 11 images — in Araliaceae

Kerria japonica (L.) DC. — Japanese rose — 4 images — in Rosaceae

Kochia scoparia (L.) Schrad. — summer cypress — 18 images — in Amaranthaceae

Koelreuteria paniculata Laxm. — golden rain tree — 15 images — in Sapindaceae

Kolkwitzia amabilis Graebner — beautybush — 10 images — in Caprifoliaceae

Krigia virginica (L.) Willd. — Virginia dwarf dandelion — 39 images — in Asteraceae

Lachnanthes caroliniana (Lam.) Dandy — Carolina redroot, Carolina bloodroot — 18 images — in Haemodoraceae

Lactuca biennis (Moench) Fern. — blue wood lettuce, tall blue lettuce — 12 images — in Asteraceae

Lactuca canadensis L. — yellow wild lettuce, Canada lettuce, tall lettuce — 50 images — in Asteraceae

Lactuca serriola L. — prickly lettuce — 32 images — in Asteraceae

Lamium amplexicaule var. amplexicaule L. — common henbit, henbit deadnettle — 9 images — in Lamiaceae

Lamium argentatum (Smejkal) Henker ex G.H.Loos — variegated yellow archangel — 33 images — in Lamiaceae

Lamium galeobdolon ssp. galeobdolon (L.) L. — yellow henbit, yellow archangel — 1 images — in Lamiaceae

Lamium maculatum L. — spotted henbit, spotted deadnettle — 7 images — in Lamiaceae

Lamium purpureum var. purpureum L. — purple deadnettle, red deadnettle, red henbit — 22 images — in Lamiaceae

Lamprocapnos spectabilis (L.) Fukuhara — common bleeding heart — 2 images — in Papaveraceae

Laportea canadensis (L.) Weddell — Canada wood nettle — 13 images — in Urticaceae

Lapsana communis L. — common nipplewort — 24 images — in Asteraceae

Larix decidua P.Miller — European larch — 18 images — in Pinaceae

Larix laricina (DuRoi) K.Koch — tamarack, American larch — 15 images — in Pinaceae

Lathyrus japonicus var. maritimus (L.) Kartesz & Gandhi — beach pea — 16 images — in Fabaceae

Lathyrus latifolius L. — perennial pea, broad-leaved everlasting pea, broad-leaved sweet pea — 2 images — in Fabaceae

Lathyrus sylvestris L. — narrow-leaved vetchling, narrow-leaved everlasting pea, flat pea — 13 images — in Fabaceae

Lechea intermedia var. intermedia Leggett ex Britt. — largepod pinweed — 28 images — in Cistaceae

Lechea maritima var. maritima Leggett ex B.S.P. — beach pinweed — 77 images — in Cistaceae

Lechea minor L. — thymeleaf pinweed — 26 images — in Cistaceae

Lechea mucronata Raf. — hairy pinweed — 59 images — in Cistaceae

Lechea pulchella Raf. — Leggett's pinweed — 4 images — in Cistaceae

Lechea tenuifolia Michx. — narrow-leaved pinweed, slender pinweed — 18 images — in Cistaceae

Leersia oryzoides (L.) Sw. — rice cutgrass — 42 images — in Poaceae

Leersia virginica Willd. — white cutgrass — 9 images — in Poaceae

Lemna minor L. — common duckweed — 7 images — in Araceae

Lemna valdiviana Phil. — pale duckweed, Valdivia duckweed — 4 images — in Araceae

Leonurus cardiaca L. — motherwort — 23 images — in Lamiaceae

Lepidium campestre (L.) Ait.f. — field pepperweed, field cress, cow cress — 26 images — in Brassicaceae

Lepidium densiflorum var. densiflorum Schrader — prairie pepperweed — 2 images — in Brassicaceae

Lepidium didymum L. — lesser swinecress — 16 images — in Brassicaceae

Lepidium latifolium L. — broad-leaved pepperweed, tall pepperweed, broad-leaved peppergrass — 18 images — in Brassicaceae

Lepidium ruderale L. — roadside pepperweed, narrow-leaved peppergrass, stinking peppergrass, narrowleaf pepperwort — 4 images — in Brassicaceae

Lepidium virginicum var. virginicum L. — Virginia pepperweed, poorman's pepper — 28 images — in Brassicaceae

Lespedeza angustifolia (Pursh) Ell. — narrow-leaved bushclover — 9 images — in Fabaceae

Lespedeza capitata Michx. — round-headed bushclover — 17 images — in Fabaceae

Lespedeza cuneata (Dum.Cours.) G.Don — Chinese bushclover — 16 images — in Fabaceae

Lespedeza frutescens (L.) Hornem. — violet bushclover — 4 images — in Fabaceae

Lespedeza hirta ssp. hirta (L.) Hornem. — hairy bushclover — 13 images — in Fabaceae

Lespedeza procumbens Michx. — trailing bushclover — 12 images — in Fabaceae

Lespedeza sp. — bushclover — 4 images — in Fabaceae

Lespedeza stuevei Nutt. — Stueve's bushclover — 20 images — in Fabaceae

Lespedeza thunbergii (Nakai) H.Ohashi — tall bushclover, Thunberg's bushclover, shrub lespedeza — 26 images — in Fabaceae

Lespedeza violacea (L.) Pers. — wand bushclover — 17 images — in Fabaceae

Lespedeza virginica (L.) Britton — slender bushclover — 13 images — in Fabaceae

Lespedeza ×longifolia DC. — long-leaved bushclover — 3 images — in Fabaceae

Leucanthemum vulgare Lam. — oxeye daisy — 28 images — in Asteraceae

Leucojum aestivum L. — summer snowflake — 9 images — in Amaryllidaceae

Leucothoe fontanesiana (Steudel) Sleumer — doghobble, drooping fetterbush — 15 images — in Ericaceae

Liatris novae-angliae var. novae-angliae (Lunell) Shinners — New England blazing star, northern blazing star — 36 images — in Asteraceae

Liatris spicata var. spicata (L.) Willd. — sessile-headed blazing star, marsh blazing star — 8 images — in Asteraceae

Ligusticum canadense ? — American lovage, boar hog root — 8 images — in Apiaceae

Ligusticum scothicum ssp. scothicum L. — sea lovage, Scotch lovage — 4 images — in Apiaceae

Ligustrum obtusifolium var. obtusifolium Sieb. & Zucc. — Japanese privet, ibota privet — 22 images — in Oleaceae

Ligustrum ovalifolium Hassk. — California privet — 16 images — in Oleaceae

Ligustrum sinense Lour. — Chinese privet — 5 images — in Oleaceae

Ligustrum vulgare L. — European common privet — 13 images — in Oleaceae

Lilaeopsis chinensis (L.) Kuntze — eastern grasswort — 2 images — in Apiaceae

Lilium canadense L. — Canada lily, wild yellow lily — 19 images — in Liliaceae

Lilium lancifolium Thunb. — tiger lily, lanceleaf lily — 6 images — in Liliaceae

Lilium philadelphicum L. — wood lily — 50 images — in Liliaceae

Lilium sp. — unknown hybrid — 2 images — in Liliaceae

Lilium superbum L. — Turk's cap lily — 4 images — in Liliaceae

Limonium carolinianum (Walt.) Britt. — Carolina sea lavender — 43 images — in Plumbaginaceae

Linaria maroccana Hook.f. — Moroccan toadflax — 3 images — in Plantaginaceae

Linaria vulgaris P.Miller — yellow toadflax, common Eurasian toadflax, butter-and-eggs — 16 images — in Plantaginaceae

Lindera benzoin (L.) Blume — northern spicebush — 64 images — in Lauraceae

Lindernia dubia var. anagallidea (Michx.) Cooperrider — yellow-seeded false pimpernel — 31 images — in Linderniaceae

Lindernia dubia var. dubia (L.) Pennell — yellow-seeded riverside lindernia — 3 images — in Linderniaceae

Linnaea borealis ssp. americana (Forbes) Hultén ex R.T.Clausen — American twinflower — 9 images — in Caprifoliaceae

Linum intercursum Bicknell — sandplain yellow flax — 16 images — in Linaceae

Linum medium ssp. texanum (Planchon) A.Haines — Texan yellow flax, stiff yelow flax, common yellow flax — 7 images — in Linaceae

Linum perenne L. — perennial blue flax — 9 images — in Linaceae

Linum usitatissimum L. — cultivated blue flax, European common flax — 3 images — in Linaceae

Linum virginianum L. — Virginia yellow flax, woodland yellow flax — 26 images — in Linaceae

Lipocarpha micrantha (Vahl) G.C.Tucker — small-flowered dwarf bulrush — 27 images — in Cyperaceae

Liquidambar styraciflua L. — sweetgum — 25 images — in Altingiaceae

Liriodendron tulipifera L. — tuliptree — 42 images — in Magnoliaceae

Liriope graminifolia (L.) Baker — lilyturf — 6 images — in Asparagaceae

Lobelia cardinalis L. — cardinalflower — 30 images — in Campanulaceae

Lobelia dortmanna L. — water lobelia — 28 images — in Campanulaceae

Lobelia erinus L. — edging lobelia, garden lobelia, trailing lobelia — 6 images — in Campanulaceae

Lobelia inflata L. — bladder-pod lobelia, Indian tobacco — 30 images — in Campanulaceae

Lobelia siphilitica var. siphilitica L. — great blue lobelia — 15 images — in Campanulaceae

Lobelia spicata var. spicata Lam. — pale spiked lobelia — 1 images — in Campanulaceae

Lobularia maritima (L.) Desv. — sweet alyssum — 4 images — in Brassicaceae

Lolium multiflorum Lam. — Italian ryegrass — 4 images — in Poaceae

Lolium perenne L. — perennial ryegrass — 28 images — in Poaceae

Lonicera canadensis Bartram ex Marsh. — fly honeysuckle — 19 images — in Caprifoliaceae

Lonicera dioica L. — wild honeysuckle — 4 images — in Caprifoliaceae

Lonicera involucrata (Richardson) Banks ex Spreng. — twinberry honeysuckle — 3 images — in Caprifoliaceae

Lonicera japonica Thunb. — Japanese honeysuckle — 38 images — in Caprifoliaceae

Lonicera maackii (Rupr.) Maxim. — Amur honeysuckle — 35 images — in Caprifoliaceae

Lonicera morrowii A.Gray — Morrow's honeysuckle — 57 images — in Caprifoliaceae

Lonicera periclymenum L. — woodbine, European common honeysuckle — 3 images — in Caprifoliaceae

Lonicera sempervirens var. sempervirens L. — trumpet honeysuckle — 11 images — in Caprifoliaceae

Lonicera tatarica L. — Tatarian honeysuckle — 3 images — in Caprifoliaceae

Lonicera xylosteum L. — European fly honeysuckle — 21 images — in Caprifoliaceae

Lonicera ×bella Zabel — hybrid honeysuckle, whitebell honeysuckle — 40 images — in Caprifoliaceae

Lotus corniculatus L. — birdsfoot trefoil — 10 images — in Fabaceae

Ludwigia alternifolia L. — squarepod seedbox — 31 images — in Onagraceae

Ludwigia palustris (L.) Elliott — marsh seedbox, water purslane — 26 images — in Onagraceae

Ludwigia sphaerocarpa Elliott — round-fruited seedbox — 15 images — in Onagraceae

Lunaria annua L. — dollar plant, money plant, moonwort, annual honesty — 13 images — in Brassicaceae

Lupinus perennis ssp. perennis L. — wild lupine, sundial lupine — 23 images — in Fabaceae

Lupinus polyphyllus var. polyphyllus Lindley — garden lupine, Washington lupine — 17 images — in Fabaceae

Luzula bulbosa (Wood) Rydb. — bulbous woodrush — 2 images — in Juncaceae

Luzula campestris (L.) DC. — field woodrush — 6 images — in Juncaceae

Luzula echinata (Small) Hermann — hedgehog woodrush — 3 images — in Juncaceae

Luzula multiflora ssp. multiflora (Retz.) Lej. — common woodrush — 37 images — in Juncaceae

Lychnis coronaria (L.) Murray — mullein lychnis, mullein pink — 11 images — in Caryophyllaceae

Lychnis flos-cuculi ssp. flos-cuculi L. — ragged robin lychnis, ragged robin — 9 images — in Caryophyllaceae

Lycium chinense P.Miller — Chinese matrimony vine — 10 images — in Solanaceae

Lycopodiella appressa (Chapman) Cranfill — southern bog clubmoss — 21 images — in Lycopodiaceae

Lycopodiella inundata (L.) Holub — northern bog clubmoss — 12 images — in Lycopodiaceae

Lycopodiella ×gilmanii A.Haines — Gilman's bog clubmoss — 6 images — in Lycopodiaceae

Lycopodium clavatum L. — staghorn clubmoss, running clubmoss — 13 images — in Lycopodiaceae

Lycopus americanus Muhl. ex W.Barton — American bugleweed, American water horehound — 33 images — in Lamiaceae

Lycopus amplectens Raf. — pondshore water horehound, sessile-leaved water horehound, clasping water horehound — 33 images — in Lamiaceae

Lycopus europaeus L. — European water horehound — 1 images — in Lamiaceae

Lycopus rubellus Moench — stalked water horehound, swamp water horehound — 29 images — in Lamiaceae

Lycopus uniflorus Michx. — tuberous water horehound, northern water horehound — 54 images — in Lamiaceae

Lycopus virginicus L. — Virginia water horehound, floodplain water horehound — 37 images — in Lamiaceae

Lygodium palmatum (Bernh. ex Schrader) Sw. — American climbing fern — 22 images — in Schizaeaceae

Lyonia ligustrina var. ligustrina (L.) DC. — maleberry — 62 images — in Ericaceae

Lysichiton camtschatcensis (L.) Schott — Asian skunk cabbage — 10 images — in Araceae

Lysimachia borealis (Raf.) U.Manns & Anderb. — American starflower — 16 images — in Primulaceae

Lysimachia ciliata L. — fringed loosestrife — 14 images — in Primulaceae

Lysimachia clethroides Duby ex DC. — gooseneck loosestrife — 4 images — in Primulaceae

Lysimachia hybrida Michx. — narrow-leaved loosestrife, lowland loosestrife — 12 images — in Primulaceae

Lysimachia maritima (L.) Galasso, Banfi & Soldano — sea milkwort — 9 images — in Primulaceae

Lysimachia nummularia L. — creeping loosestrife, creeping Jenny, moneywort — 12 images — in Primulaceae

Lysimachia punctata L. — spotted loosestrife, large loosestrife — 9 images — in Primulaceae

Lysimachia quadrifolia L. — whorled loosestrife — 19 images — in Primulaceae

Lysimachia terrestris (L.) B.S.P. — swamp loosestrife, swamp candles — 25 images — in Primulaceae

Lysimachia thyrsiflora L. — tufted loosestrife — 9 images — in Primulaceae

Lysimachia vulgaris L. — garden loosestrife — 7 images — in Primulaceae

Lysimachia ×producta (A.Gray) Fern. — produced loosestrife — 6 images — in Primulaceae

Lythrum salicaria L. — purple loosestrife — 39 images — in Lythraceae

Maclura pomifera (Raf.) Schneid. — osage orange — 23 images — in Moraceae

Magnolia acuminata L. — cucumber tree, cucumbertree — 6 images — in Magnoliaceae

Magnolia macrophylla Michx. — bigleaf magnolia — 2 images — in Magnoliaceae

Magnolia tripetala (L.) L. — umbrella magnolia — 14 images — in Magnoliaceae

Magnolia virginiana ssp. virginiana L. — sweetbay magnolia — 13 images — in Magnoliaceae

Magnolia ×soulangeana Soul.-Bod. — saucer magnolia, Chinese magnolia — 8 images — in Magnoliaceae

Maianthemum amplexicaule (Nutt.) W.A.Weber — western false Solomon's seal — 3 images — in Ruscaceae

Maianthemum canadense Desf. — Canada mayflower — 18 images — in Ruscaceae

Maianthemum racemosum ssp. racemosum (L.) Link — false Solomon's seal — 22 images — in Ruscaceae

Maianthemum stellatum (L.) Link — starry Solomon's seal, star-like false Solomon's seal — 30 images — in Ruscaceae

Malus baccata (L.) Borkh. — Siberian crabapple — 25 images — in Rosaceae

Malus domestica (Suckow) Borkh — orchard apple, common apple — 10 images — in Rosaceae

Malus floribunda Sieb. ex Van Houtte — Japanese flowering crabapple — 20 images — in Rosaceae

Malus prunifolia (Willd.) Borkh. — plum-leaved crabapple — 7 images — in Rosaceae

Malus toringo (Siebold) Siebold ex de Vriese — Japanese crabapple, Toringo crab, Siebold's crabapple — 17 images — in Rosaceae

Malva alcea L. — vervain mallow — 4 images — in Malvaceae

Malva moschata L. — musk mallow — 9 images — in Malvaceae

Malva neglecta Wallr. — common mallow, cheeses — 16 images — in Malvaceae

Marsilea quadrifolia L. — European clover-fern, European waterclover, four-leaf clover, pepperwort — 7 images — in Marsileaceae

Matricaria chamomilla L. — German chamomile, Hungarian chamomile, scented mayweed — 5 images — in Asteraceae

Matricaria discoidea DC. — rayless chamomile, pineapple weed — 3 images — in Asteraceae

Matteuccia struthiopteris ssp. pensylvanica (Willd.) A.Löve & D.Löve — American ostrich fern — 29 images — in Onocleaceae

Medeola virginiana L. — Indian cucumber root, Indian cucumber — 37 images — in Liliaceae

Medicago lupulina L. — black medick — 5 images — in Fabaceae

Medicago sativa L. — purple medick, lucerne, blue alfalfa — 5 images — in Fabaceae

Melampyrum lineare Desr. — cowwheat — 18 images — in Orobanchaceae

Melilotus albus Medik. — white sweetclover — 15 images — in Fabaceae

Melilotus officinalis (L.) Lam. — yellow sweetclover — 9 images — in Fabaceae

Melissa officinalis L. — lemon balm — 23 images — in Lamiaceae

Menispermum canadense L. — Canada moonseed — 3 images — in Menispermaceae

Mentha arvensis ssp. parietariifolia (Becker) Briq. — field mint, ginger mint — 2 images — in Lamiaceae

Mentha canadensis L. — American field mint — 11 images — in Lamiaceae

Mentha spicata ssp. spicata L. — spearmint — 6 images — in Lamiaceae

Mentha ×piperita L. — peppermint — 7 images — in Lamiaceae

Mentha ×rotundifolia (L.) Hudson — round-leaved mint — 2 images — in Lamiaceae

Mentha ×villosa Hudson — woolly mint — 13 images — in Lamiaceae

Menyanthes trifoliata L. — bogbean, buckbean — 7 images — in Menyanthaceae

Mertensia ciliata (James ex Torr.) G.Don — mountain bluebells — 1 images — in Boraginaceae

Mertensia virginica (L.) Pers. ex Link — Virginia bluebells, eastern bluebells, Virginia cowslip — 5 images — in Boraginaceae

Metasequoia glyptostroboides Hu & W.C.Cheng — dawn redwood — 10 images — in Cupressaceae

Micranthes pensylvanica (L.) Haw. — swamp small-flowered saxifrage — 13 images — in Saxifragaceae

Micranthes virginiensis (Michx.) Small — early saxifrage — 25 images — in Saxifragaceae

Microstegium vimineum (Trin.) A.Camus — Japanese stiltgrass — 31 images — in Poaceae

Mikania scandens (L.) Willd. — climbing hempvine — 30 images — in Asteraceae

Mimulus ringens L. — long-stalked monkeyflower, square-stemmed monkeyflower, Allegheny monkeyflower — 17 images — in Phrymaceae

Mirabilis nyctaginea (Michx.) MacMillan — heartleaf umbrellawort, heartleaf four-o'clock — 13 images — in Nyctaginaceae

Miscanthus sinensis Andersson — Chinese silvergrass, Chinese plumegrass — 48 images — in Poaceae

Mitchella repens L. — partridgeberry — 23 images — in Rubiaceae

Mitella diphylla L. — twoleaf miterwort, twoleaf mitrewort, coolwort, Bishop's cap — 12 images — in Saxifragaceae

Moehringia lateriflora (L.) Fenzl — blunt-leaved grove sandwort — 15 images — in Caryophyllaceae

Mollugo verticillata L. — whorled chickweed, green carpetweed — 29 images — in Molluginaceae

Monarda didyma L. — scarlet beebalm, crimson beebalm — 1 images — in Lamiaceae

Monarda fistulosa ssp. fistulosa var. mollis (L.) Benth. — soft wild bergamot, soft wild beebalm — 17 images — in Lamiaceae

Monarda media Willd. — purple bergamot, purple beebalm — 2 images — in Lamiaceae

Monotropa uniflora L. — Indian pipe — 30 images — in Ericaceae

Morella pensylvanica (Mirbel) Kartesz — bayberry — 36 images — in Myricaceae

Morus alba L. — white mulberry — 18 images — in Moraceae

Muhlenbergia frondosa (Poir.) Fern. — wirestem muhly — 11 images — in Poaceae

Muhlenbergia schreberi J.F.Gmelin — nimblewill muhly, nimblewill — 6 images — in Poaceae

Muhlenbergia sobolifera (Muhl. ex Willd.) Trin. — rock muhly, awnless woodland muhly — 9 images — in Poaceae

Muhlenbergia uniflora (Muhl.) Fern. — pondshore muhly, bog muhly — 27 images — in Poaceae

Mummenhoffia alliacea (L.) Esmailbegi & Al-Shehbaz — garlic pennycress, roadside pennycress — 26 images — in Brassicaceae

Muscari armeniacum Leichtlin ex Baker — Armenian grape hyacinth, garden grape hyacinth — 1 images — in Asphodelaceae

Muscari botryoides (L.) P.Miller — common grape hyacinth — 2 images — in Asphodelaceae

Muscari neglectum Guss. ex Ten. — Atlantic grape hyacinth — 18 images — in Asphodelaceae

Mycelis muralis (L.) Dumort. — wall lettuce — 8 images — in Asteraceae

Myosotis arvensis (L.) Hill — field forget-me-not, field scorpiongrass — 6 images — in Boraginaceae

Myosotis discolor Pers. — yellow-and-blue forget-me-not, changing forget-me-not — 2 images — in Boraginaceae

Myosotis scorpioides L. — true forget-me-not, water forget-me-not, scorpionweed — 12 images — in Boraginaceae

Myosotis stricta Link ex Roemer & J.A.Schultes — blue scorpion grass — 27 images — in Boraginaceae

Myosotis sylvatica Ehrh. ex Hoffm. — garden forget-me-not, wood forget-me-not, woodland forget-me-not — 11 images — in Boraginaceae

Myosotis verna Nutt. — early scorpiongrass, spring forget-me-not, early forget-me-not — 10 images — in Boraginaceae

Myosoton aquaticum (L.) Moench — giant chickweed — 5 images — in Caryophyllaceae

Myrica gale L. — sweet gale — 58 images — in Myricaceae

Myriophyllum aquaticum Camb. — parrot's feather, parrotfeather watermilfoil — 4 images — in Haloragaceae

Myriophyllum heterophyllum Michx. — variable watermilfoil — 12 images — in Haloragaceae

Myriophyllum humile (Raf.) Morong — lowly watermilfoil — 47 images — in Haloragaceae

Myriophyllum spicatum L. — Eurasian watermilfoil, spiked watermilfoil — 11 images — in Haloragaceae

Myriophyllum tenellum Bigelow — slender watermilfoil, leafless watermilfoil — 14 images — in Haloragaceae

Nabalus altissimus (L.) Hooker — tall rattlesnake root, slender rattlesnake root — 20 images — in Asteraceae

Nabalus serpentarius (Pursh) Hooker — lion's foot, rattlesnake root — 11 images — in Asteraceae

Nabalus trifoliolatus Cass. — three-leaved rattlesnake root, gall-of-the-earth — 29 images — in Asteraceae

Najas flexilis (Willd.) Rostk. & Schmidt — wavy waternymph, common naiad — 16 images — in Hydrocharitaceae

Najas guadalupensis ssp. olivacea (Rosendahl & Butters) Haynes & Hellquist — stout Guadalupe waternymph, stout Guadalupe naiad — 5 images — in Hydrocharitaceae

Narcissus bulbocodium L. — petticoat daffodil, hoop-petticoat daffodil — 5 images — in Amaryllidaceae

Narcissus minor L. — small-flowered daffodil — 6 images — in Amaryllidaceae

Narcissus poeticus L. — poet's daffodil — 4 images — in Amaryllidaceae

Narcissus pseudonarcissus L. — wild daffodil, trumpet daffodil — 10 images — in Amaryllidaceae

Narcissus spp. — cultivars — 6 images — in Amaryllidaceae

Narcissus ×incomparabilis Mill. — incomparable daffodil — 4 images — in Amaryllidaceae

Nasturtium microphyllum Boenn. ex Reichenb. — one-row watercress, narrow-fruited watercress — 6 images — in Brassicaceae

Nasturtium officinale Ait.f. — common watercress — 11 images — in Brassicaceae

Nelumbo lutea Willd. — American lotus, yellow lotus — 4 images — in Nelumbonaceae

Nepeta cataria L. — catnip — 9 images — in Lamiaceae

Nicandra physalodes (L.) Gaertner — apple-of-Peru — 7 images — in Solanaceae

Nicotiana alata Link & Otto — winged tobacco, jasmine tobacco — 2 images — in Solanaceae

Nicotiana rustica L. — Aztec tobacco, wild tobacco — 4 images — in Solanaceae

Nicotiana tabacum L. — cultivated tobacco — 2 images — in Solanaceae

Nipponanthemum nipponicum (Franch. ex Maxim.) Kitam. — Nippon daisy — 9 images — in Asteraceae

Nuphar advena (Ait.) Ait.f. — immigrant pondlily, immigrant spaterdock — 16 images — in Nymphaeaceae

Nuphar variegata Durand ex Clinton — yellow waterlily, spatterdock — 41 images — in Nymphaeaceae

Nuttallanthus canadensis (L.) D.A.Sutton — blue toadflax, old-field toadflax — 37 images — in Plantaginaceae

Nymphaea odorata ssp. odorata Aiton — American white waterlily, fragrant waterlily — 29 images — in Nymphaeaceae

Nymphaea odorata ssp. tuberosa (Paine) Wiersema & Hellquist — tuberous waterlily — 14 images — in Nymphaeaceae

Nymphoides cordata (Ell.) Fern. — little floating heart — 26 images — in Menyanthaceae

Nymphoides peltata Gmelin (Kuntze) — yellow floating heart — 17 images — in Menyanthaceae

Nyssa sylvatica Marshall — tupelo, black gum — 108 images — in Cornaceae

Oclemena acuminata (Michx.) G.L.Nesom — whorled wood aster — 35 images — in Asteraceae

Oclemena nemoralis (Aiton) Greene — bog aster — 12 images — in Asteraceae

Oclemena ×blakei (Porter) G.L.Nesom — Blake's aster — 2 images — in Asteraceae

Odontites vernus ssp. serotinus (Dumort.) Corb. — red false bartsia — 8 images — in Orobanchaceae

Oenanthe javanica (Blume) DC. — Java waterdropwort, water dropwort, water celery — 10 images — in Apiaceae

Oenothera biennis L. — common evening primrose — 39 images — in Onagraceae

Oenothera oakesiana (A.Gray) J.W.Robbins ex S.Wats. & Coult. — Oakes' evening primrose, cross-shaped evening primrose — 20 images — in Onagraceae

Oenothera parviflora L. — small-flowered evening primrose — 9 images — in Onagraceae

Oenothera perennis L. — little evening primrose, little sundrops — 11 images — in Onagraceae

Oenothera pilosella ssp. pilosella Raf. — meadow evening primrose, hairy sundrops — 2 images — in Onagraceae

Onoclea sensibilis L. — sensitive fern — 38 images — in Onocleaceae

Opuntia humifusa (Raf.) Raf. — eastern prickly pear, devil's tongue — 8 images — in Cactaceae

Origanum majorana L. — wild marjoram — 4 images — in Lamiaceae

Origanum vulgare L. — oregano, sweet marjoram — 3 images — in Lamiaceae

Ornithogalum umbellatum L. — star-of-Bethlehem — 25 images — in Asphodelaceae

Orobanche uniflora L. — one-flowered broomrape, one-flowered cancer-root, ghost pipe — 22 images — in Orobanchaceae

Orontium aquaticum L. — golden club — 3 images — in Araceae

Oryzopsis asperifolia Michx. — spreading ricegrass, white-grained ricegrass — 24 images — in Poaceae

Osmorhiza claytonii (Michx.) C.B.Clarke — Clayton's sweet cicely — 28 images — in Apiaceae

Osmorhiza longistylis (Torrey) DC. — long-styled sweet cicely, aniseroot — 20 images — in Apiaceae

Osmunda claytoniana L. — interrupted fern — 38 images — in Osmundaceae

Osmunda regalis ssp. spectabilis (Willd.) A.Löve & D.Löve — American royal fern — 45 images — in Osmundaceae

Osmundastrum cinnamomeum (L.) C.Presl — cinnamon fern — 39 images — in Osmundaceae

Ostrya virginiana (P.Mill.) K.Koch — eastern hophornbeam — 42 images — in Betulaceae

Othocallis mischtschenkoana (Grossh.) Speta — Mishchenko squill — 10 images — in Asphodelaceae

Othocallis siberica (Haw. ex Andr.) Speta — Siberian squill — 18 images — in Asphodelaceae

Oxalis corniculata L. — creeping woodsorrel — 10 images — in Oxalidaceae

Oxalis dillenii Jacq. — showy woodsorrel, southern woodsorrel, slender woodsorrel — 32 images — in Oxalidaceae

Oxalis florida Salisb. — flowering woodsorrel, smooth woodsorrel — 6 images — in Oxalidaceae

Oxalis montana Raf. — mountain woodsorrel, northern woodsorrel — 12 images — in Oxalidaceae

Oxalis stricta L. — common yellow woodsorrel — 25 images — in Oxalidaceae

Oxalis violacea L. — violet woodsorrel — 4 images — in Oxalidaceae

Oxydendrum arboreum (L.) DC. — sourwood — 7 images — in Ericaceae

Pachysandra procumbens Michx. — Allegheny spurge — 15 images — in Buxaceae

Pachysandra terminalis Sieb. & Zucc. — Japanese spurge — 12 images — in Buxaceae

Packera aurea (L.) A.Löve & D.Löve — golden ragwort, golden groundsel — 26 images — in Asteraceae

Packera crocata (Rydb.) W.A. Weber & Á. Löve — saffron ragwort — 1 images — in Asteraceae

Packera obovata (Muhl. ex Willd.) W.A.Weber & A.Löve — broad-leaved ragwort, running groundsel — 15 images — in Asteraceae

Packera paupercula (Michx.) W.A.Weber & A.Löve — balsam ragwort, balsam groundsel — 9 images — in Asteraceae

Paeonia officinalis L. — garden peony, common peony — 2 images — in Paeoniaceae

Panax trifolius L. — dwarf ginseng — 25 images — in Araliaceae

Panicum amarum ssp. amarulum (A.S.Hitchc. & Chase) Freckmann & Lelong — bitter panicgrass — 11 images — in Poaceae

Panicum capillare ssp. capillare L. — witchgrass, witch panicgrass — 16 images — in Poaceae

Panicum dichotomiflorum var. dichotomiflorum Michx. — fall panicgrass — 38 images — in Poaceae

Panicum philadelphicum ssp. philadelphicum Bernh. ex Trin. — Philadelphia panicgrass — 11 images — in Poaceae

Panicum verrucosum Muhl. — warty panicgrass — 24 images — in Poaceae

Panicum virgatum L. — switch panicgrass, switchgrass — 41 images — in Poaceae

Papaver rhoeas L. — corn poppy, field poppy — 1 images — in Papaveraceae

Parathelypteris noveboracensis (L.) Ching — New York fern — 24 images — in Thelypteridaceae

Parathelypteris simulata (Davenport) Holttum — Massachusetts fern — 23 images — in Thelypteridaceae

Parietaria pensylvanica Muhl. ex Willd. — Pennsylvania pellitory, rock pellitory — 7 images — in Urticaceae

Paronychia canadensis (L.) A.Wood — smooth forked whitlow-wort, forked chickweed — 11 images — in Caryophyllaceae

Paronychia fastigiata var. fastigiata (Raf.) Fern. — hairy forked whitlow-wort, hairy forked chickweed — 8 images — in Caryophyllaceae

Parthenocissus inserta (Kerner) Fritsch — thicket creeper, grape woodbine — 26 images — in Vitaceae

Parthenocissus quinquefolia (L.) Planchon — Virginia creeper — 47 images — in Vitaceae

Parthenocissus tricuspidata (Sieb. & Zucc.) Planchon — Japanese creeper, Japanese ivy, grape ivy, Boston ivy — 11 images — in Vitaceae

Paspalum setaceum var. muhlenbergii (Nash) D.Banks — Muhlenberg's beadgrass — 33 images — in Poaceae

Paspalum setaceum var. psammophilum (Nash) D.Banks — sand beadgrass — 12 images — in Poaceae

Paspalum setaceum var. setaceum Michx. — small-fruited beadgrass, slender beadgrass — 7 images — in Poaceae

Pastinaca sativa L. — wild parsnip — 22 images — in Apiaceae

Paulownia tomentosa (Thunb.) Sieb. & Zucc. ex Steudel — princess tree, empress tree, foxglove tree — 10 images — in Paulowniaceae

Paxistima myrsinites (Pursh) Raf. — Oregon boxleaf, myrtle box leaf — 2 images — in Celastraceae

Pedicularis bracteosa Benth. — bracted lousewort — 2 images — in Orobanchaceae

Pedicularis canadensis ssp. canadensis L. — wood betony, Canadian lousewort, common lousewort — 15 images — in Orobanchaceae

Peltandra virginica (L.) Raf. ex Schott — green arrow arum, bog arum, tuckahoe — 28 images — in Araceae

Penstemon digitalis Nutt. ex Sims — tall white beardtongue — 14 images — in Plantaginaceae

Penthorum sedoides L. — ditch stonecrop — 15 images — in Penthoraceae

Perovskia atriplicifolia Benth. — Russian sage — 12 images — in Lamiaceae

Persicaria amphibia ssp. laevimarginata (Hultén) Soják — erect water smartweed — 2 images — in Polygonaceae

Persicaria arifolia (L.) Haraldson — halberdleaf tearthumb — 18 images — in Polygonaceae

Persicaria careyi (Olney) Greene — Carey's smartweed — 39 images — in Polygonaceae

Persicaria coccinea (Muhl. ex Willd.) Greene — scarlet smartweed — 18 images — in Polygonaceae

Persicaria extremiorientalis (Vorosch.) Tzvelev — Far East smartweed — 7 images — in Polygonaceae

Persicaria filiformis (Thunb.) Nakai — Asian jumpseed — 1 images — in Polygonaceae

Persicaria hydropiper (L.) Opiz — waterpepper smartweed, water pepper — 6 images — in Polygonaceae

Persicaria hydropiperoides (Michx.) Small — false waterpepper smartweed, false water pepper, mild water pepper — 28 images — in Polygonaceae

Persicaria lapathifolia (L.) S.F.Gray — dock-leaved smartweed, nodding smartweed, willowweed smartweed — 5 images — in Polygonaceae

Persicaria longiseta (Bruijn) Kitagawa — Chinese smartweed, Oriental lady's thumb, bristly lady's thumb — 20 images — in Polygonaceae

Persicaria maculosa S.F.Gray — lady's thumb smartweed, spotted lady's thumb — 26 images — in Polygonaceae

Persicaria pensylvanica (L.) G.Maza — Pennsylvania smartweed — 35 images — in Polygonaceae

Persicaria perfoliata (L.) H.Gross — Asiatic tearthumb, mile-a-minute — 39 images — in Polygonaceae

Persicaria punctata (Ell.) Small — dotted smartweed — 24 images — in Polygonaceae

Persicaria puritanorum (Fern.) Soják — pondshore smartweed — 18 images — in Polygonaceae

Persicaria robustior (Small) Bicknell — stout dotted smartweed, coarse dotted smartweed — 14 images — in Polygonaceae

Persicaria sagittata (L.) H.Gross — arrowleaf tearthumb — 16 images — in Polygonaceae

Persicaria virginiana (L.) Gaertner — jumpseed, Virginia smartweed — 24 images — in Polygonaceae

Persicaria wallichii var. wallichii Greuter & Burdet — Himalayan knotweed, garden smartweed — 14 images — in Polygonaceae

Petasites hybridus (L.) Gaertner, B.Meyer & Scherb. — butterbur, butterbur sweet coltsfoot — 15 images — in Asteraceae

Petasites japonicus (Sieb. & Zucc.) Maxim. — great butterbur, giant butterbur, Japanese sweet coltsfoot — 21 images — in Asteraceae

Petunia axillaris (Lam.) B.S.P. — garden petunia — 2 images — in Solanaceae

Petunia integrifolia (Hook.) Schinz & Thellung — violet-flowered petunia — 5 images — in Solanaceae

Peucedanum palustre (L.) Moensch — milk parsley — 11 images — in Apiaceae

Phalaris arundinacea L. — reed canarygrass — 41 images — in Poaceae

Phaseolus vulgaris L. — green bean — 1 images — in Fabaceae

Phedimus spurius (M.Bieb.) 't Hart — false stonecrop — 1 images — in Crassulaceae

Phegopteris connectilis (Michx.) Watt — narrow beech fern, northern beech fern — 19 images — in Thelypteridaceae

Phegopteris hexagonoptera (Michx.) Fée — broad beech fern, southern beech fern — 6 images — in Thelypteridaceae

Phellodendron amurense Rupr. — Amur corktree — 68 images — in Rutaceae

Phellodendron chinense C.K.Schneider — Chinese corktree — 2 images — in Rutaceae

Philadelphus coronarius L. — sweet mock-orange, European mock-orange — 3 images — in Hydrangeaceae

Philadelphus inodorus L. — scentless mock-orange, Appalachian mock-orange — 1 images — in Hydrangeaceae

Philadelphus pubescens Loisel. — hoary mock-orange, Ozark mock-orange — 4 images — in Hydrangeaceae

Phleum pratense L. — common Timothy — 18 images — in Poaceae

Phlox paniculata L. — garden phlox, summer phlox, fall phlox — 2 images — in Polemoniaceae

Phlox stolonifera Sims — creeping phlox — 2 images — in Polemoniaceae

Phlox subulata ssp. subulata L. — moss phlox, creeping phlox — 5 images — in Polemoniaceae

Phoenix dactylifera L. — date palm — 1 images — in Arecaceae

Photinia villosa (Thunb.) DC. — Oriental photinia, Christmas berry — 3 images — in Rosaceae

Phragmites altissimus (Benth.) Mabille ex Debeaux — giant reed — 19 images — in Poaceae

Phragmites americanus (Saltonstall, P.M.Peterson & Soreng) A.Haines — North American reed — 16 images — in Poaceae

Phragmites australis (Cav.) Trin. ex Steudel — common reed — 80 images — in Poaceae

Phyllostachys aureosulcata McClure — yellow-grooved bamboo — 9 images — in Poaceae

Phyllostachys dulcis McClure — sweetshoot bamboo — 5 images — in Poaceae

Physalis grisea (Waterfall) M.Martinez — downy groundcherry, strawberry tomato — 5 images — in Solanaceae

Physalis heterophylla var. heterophylla Nees — clammy groundcherry — 16 images — in Solanaceae

Physalis longifolia var. subglabrata (Mackenzie & Bush) Cronq. — long-leaved groundcherry — 15 images — in Solanaceae

Physalis philadelphica var. immaculata Waterfall — Mexican groundcherry, tomatillo — 9 images — in Solanaceae

Physalis pubescens var. integrifolia (Dunal) Waterfall — low hairy groundcherry — 14 images — in Solanaceae

Physocarpus opulifolius (L.) Maxim. — ninebark — 3 images — in Rosaceae

Physostegia virginiana ssp. virginiana (L.) Bentham — false dragonhead — 4 images — in Lamiaceae

Phytolacca americana var. americana L. — American pokeweed, poke sallet — 21 images — in Phytolaccaceae

Picea abies (L.) H.Karst. — Norway spruce — 55 images — in Pinaceae

Picea engelmannii Parry ex Engelm. — Engelmann spruce, white spruce, mountain spruce — 2 images — in Pinaceae

Picea glauca (Moench) Voss — white spruce — 32 images — in Pinaceae

Picea mariana (P.Miller) B.S.P. — black spruce — 36 images — in Pinaceae

Picea pungens Engelm. — blue spruce — 15 images — in Pinaceae

Picea rubens Sarg. — red spruce — 22 images — in Pinaceae

Picris hieracioides L. — hawkweed oxtongue — 2 images — in Asteraceae

Pieris floribunda (D.Don) Benth. & Hook. — fetterbush, mountain andromeda — 39 images — in Ericaceae

Pieris japonica (Thunb.) D.Don ex G.Don — Japanese andromeda — 20 images — in Ericaceae

Pilea pumila var. pumila (L.) A.Gray — Canada clearweed — 17 images — in Urticaceae

Pilosella aurantiaca (L.) F.W.Schultz & Sch. Bip. — orange hawkweed — 10 images — in Asteraceae

Pilosella caespitosa (Dumort.) P.D.Sell & C.West — meadow hawkweed, king-devil — 9 images — in Asteraceae

Pilosella flagellaris (Willd.) P.D.Sell & C.West — whip hawkweed — 6 images — in Asteraceae

Pilosella officinarum Vaill. — mouse-ear hawkweed — 8 images — in Asteraceae

Pilosella piloselloides (Vill.) Soják — smooth hawkweed — 21 images — in Asteraceae

Pinus banksiana Lamb. — Jack pine — 12 images — in Pinaceae

Pinus mugo Turra — mugo pine, Swiss mountain pine — 3 images — in Pinaceae

Pinus nigra Arnott — Austrian pine — 13 images — in Pinaceae

Pinus ponderosa Douglas ex C.Lawson — ponderosa pine, bull pine, blackjack pine — 3 images — in Pinaceae

Pinus resinosa Ait. — red pine — 32 images — in Pinaceae

Pinus rigida P.Miller — pitch pine — 133 images — in Pinaceae

Pinus strobus L. — white pine — 90 images — in Pinaceae

Pinus sylvestris L. — Scotch pine, Scots pine — 25 images — in Pinaceae

Pinus sylvestris 'Watereri' — cultivar of Scots pine — 7 images — in Pinaceae

Pinus thunbergii Parl. — Japanese black pine — 23 images — in Pinaceae

Piptatherum pungens (Torrey ex Spreng.) Dorn — little ricegrass, short-awned mountain ricegrass — 21 images — in Poaceae

Piptochaetium avenaceum (L.) Parodi — blackseeded speargrass, black oatgrass — 25 images — in Poaceae

Pistia stratiotes L. — water lettuce — 3 images — in Araceae

Pisum sativum L. — garden pea — 1 images — in Fabaceae

Pityopsis falcata (Pursh) Nutt. — sickle-leaved golden aster — 37 images — in Asteraceae

Plantago aristata Michx. — bracted plantain — 18 images — in Plantaginaceae

Plantago intermedia DC. — saltmarsh plantain, many-seeded plantain — 17 images — in Plantaginaceae

Plantago lanceolata L. — narrow-leaved plantain, English plantain, ribgrass plantain — 22 images — in Plantaginaceae

Plantago major L. — common plantain, white man's foot — 20 images — in Plantaginaceae

Plantago maritima ssp. juncoides (Lam.) Hultén — American seaside plantain — 27 images — in Plantaginaceae

Plantago rugelii Dcne. — American plantain, Rugel's plantain, blackseed plantain — 18 images — in Plantaginaceae

Platanthera aquilonis Sheviak — north wind bog orchid, northern green orchid — 4 images — in Orchidaceae

Platanthera blephariglottis var. blephariglottis (Willd.) Lindl. — white fringed orchid, white fringed bog orchid — 14 images — in Orchidaceae

Platanthera clavellata (Michx.) Luer — green woodland orchid, little clubspur bog orchid — 17 images — in Orchidaceae

Platanthera grandiflora (Bigelow) Lindl. — large purple fringed orchid, greater purple fringed bog orchid — 6 images — in Orchidaceae

Platanthera lacera (Michx.) G.Don — ragged fringed orchid, green fringed bog orchid — 9 images — in Orchidaceae

Platanus occidentalis L. — sycamore, western plane, American planetree — 56 images — in Platanaceae

Platycodon grandiflorus — balloon flower — 4 images — in Campanulaceae

Pluchea odorata var. succulenta (Fern.) Cronq. — saltmarsh fleabane, sweet-scented camphorweed — 22 images — in Asteraceae

Poa annua L. — annual bluegrass — 15 images — in Poaceae

Poa bulbosa ssp. vivipara (Koel.) Arcang. — bulbous bluegrass — 17 images — in Poaceae

Poa chapmaniana Scribner — Chapman's bluegrass — 4 images — in Poaceae

Poa compressa L. — flat-stemmed bluegrass — 14 images — in Poaceae

Poa nemoralis L. — woodland bluegrass — 5 images — in Poaceae

Poa palustris L. — fowlmeadow bluegrass — 6 images — in Poaceae

Poa pratensis ssp. angustifolia (L.) Arcang. — narrow-leaved Kentucky bluegrass, narrow-leaved June grass — 8 images — in Poaceae

Poa trivialis ssp. trivialis L. — rough-sheathed bluegrass, rough bluegrass — 5 images — in Poaceae

Podophyllum peltatum L. — mayapple, wild mandrake — 17 images — in Berberidaceae

Pogonia ophioglossoides (L.) Ker Gawler — rose pogonia — 17 images — in Orchidaceae

Polemonium caeruleum L. — blue Jacob's ladder — 1 images — in Polemoniaceae

Polemonium reptans var. reptans L. — spreading Jacob's ladder, Greek valerian — 4 images — in Polemoniaceae

Polygala cruciata ssp. aquilonia (Fern. & Schub.) A.Haines — northern cross-leaved milkwort — 27 images — in Polygalaceae

Polygala nuttallii Torrey & A.Gray — Nuttall's milkwort — 17 images — in Polygalaceae

Polygala polygama Walter — racemed milkwort, bitter milkwort — 27 images — in Polygalaceae

Polygala sanguinea L. — purple milkwort, common milkwort, blood milkwort — 17 images — in Polygalaceae

Polygala verticillata L. — whorled milkwort — 14 images — in Polygalaceae

Polygaloides paucifolia (Willd.) J.R.Abbott — fringed milkwort, flowering wintergreen — 14 images — in Polygalaceae

Polygonatum biflorum (Walter) Ell. — giant Solomon's seal — 4 images — in Ruscaceae

Polygonatum latifolium (Jacq.) Desf. — broad-leaved Solomon's seal — 5 images — in Ruscaceae

Polygonatum pubescens (Willd.) Pursh — hairy Solomon's seal — 29 images — in Ruscaceae

Polygonum articulatum L. — coastal jointed knotweed, jointweed — 36 images — in Polygonaceae

Polygonum aviculare ssp. aviculare L. — common knotweed, dooryard knotweed, doorweed — 1 images — in Polygonaceae

Polygonum aviculare ssp. depressum (Meisner) Arcangeli — mat-forming common knotweed — 16 images — in Polygonaceae

Polygonum aviculare ssp. neglectum (Besser) Arcangeli — narrow-leaved common knotweed — 9 images — in Polygonaceae

Polygonum aviculare ssp. rurivagum (Jordan ex Boreau) Berher — fibrous-veined common knotweed — 17 images — in Polygonaceae

Polygonum buxiforme Small — boxleaf knotweed, box knotweed — 21 images — in Polygonaceae

Polygonum glaucum Nutt. — seaside knotweed — 10 images — in Polygonaceae

Polygonum ramosissimum ssp. prolificum (Small) Costea & Tardif — productive yellow-flowered knotweed, productive saltmarsh knotweed — 15 images — in Polygonaceae

Polygonum tenue Michx. — slender knotweed, rock knotweed — 12 images — in Polygonaceae

Polypodium appalachianum Haufler & Windham — Appalachian rock polypody — 19 images — in Polypodiaceae

Polypodium virginianum L. — rockcap fern, common rock polypody — 52 images — in Polypodiaceae

Polystichum acrostichoides (Michx.) Schott — Christmas fern — 37 images — in Dryopteridaceae

Pontederia cordata L. — pickerelweed — 41 images — in Pontederiaceae

Populus alba L. — white poplar — 18 images — in Salicaceae

Populus angustifolia James — narrowleaf cottonwood — 5 images — in Salicaceae

Populus balsamifera ssp. balsamifera L. — balsam poplar — 5 images — in Salicaceae

Populus deltoides ssp. deltoides Bartr. ex Marsh. — eastern cottonwood, necklace poplar — 41 images — in Salicaceae

Populus grandidentata Michx. — bigtooth aspen — 38 images — in Salicaceae

Populus heterophylla L. — swamp cottonwood, swamp poplar — 4 images — in Salicaceae

Populus nigra L. — Lombardy poplar, black poplar — 13 images — in Salicaceae

Populus tremuloides Michx. — American trembling aspen, quaking aspen — 49 images — in Salicaceae

Populus ×jackii Sarg. — Jack's poplar, balm-of-Gilead — 1 images — in Salicaceae

Portulaca grandiflora Hooker — cultivated purslane, red portulaca — 7 images — in Portulacaceae

Portulaca oleracea L. — common purslane — 20 images — in Portulacaceae

Potamogeton amplifolius Tuckerman — bigleaf pondweed — 7 images — in Potamogetonaceae

Potamogeton berchtoldii Fieber — Berchtold's pondweed, slender tiny pondweed — 11 images — in Potamogetonaceae

Potamogeton bicupulatus Fernald — snailseed pondweed, hairlike pondweed — 18 images — in Potamogetonaceae

Potamogeton crispus L. — crispy pondweed, curly pondweed — 3 images — in Potamogetonaceae

Potamogeton epihydrus Raf. — surface pondweed, ribbonleaf pondweed — 38 images — in Potamogetonaceae

Potamogeton gramineus L. — grassleaf pondweed — 4 images — in Potamogetonaceae

Potamogeton natans L. — floating pondweed — 6 images — in Potamogetonaceae

Potamogeton nodosus Poiret — long-leaved pondweed — 4 images — in Potamogetonaceae

Potamogeton oakesianus J.W.Robbins — Oakes' pondweed — 13 images — in Potamogetonaceae

Potamogeton pulcher Tuckerman — spotted pondweed — 6 images — in Potamogetonaceae

Potamogeton spirillus Tuckerman — northern snailseed pondweed — 4 images — in Potamogetonaceae

Potentilla anglica Laicharding — English cinquefoil — 1 images — in Rosaceae

Potentilla argentea L. — silver cinquefoil, silver-leaved cinquefoil — 32 images — in Rosaceae

Potentilla canadensis L. — dwarf cinquefoil — 23 images — in Rosaceae

Potentilla indica (Andr.) T.Wolf — Indian strawberry — 19 images — in Rosaceae

Potentilla norvegica L. — Norwegian cinquefoil, three-finger, strawberryweed — 19 images — in Rosaceae

Potentilla recta L. — sulphur cinquefoil, rough-fruited cinquefoil — 14 images — in Rosaceae

Potentilla simplex Michx. — common cinquefoil, oldfield cinquefoil — 14 images — in Rosaceae

Primula ×polyantha Mill. — hybrid primrose — 4 images — in Primulaceae

Proserpinaca palustris L. — marsh mermaidweed, common mermaidweed — 16 images — in Haloragaceae

Proserpinaca pectinata Lam. — cut-leaved mermaidweed, comb-leaved mermaidweed — 13 images — in Haloragaceae

Prunella vulgaris ssp. lanceolata (W.Barton) Hultén — American heal-all, American selfheal — 7 images — in Lamiaceae

Prunella vulgaris ssp. vulgaris L. — Eurasian heal-all, common selfheal — 3 images — in Lamiaceae

Prunus alleghaniensis var. alleghaniensis Porter — Allegheny plum — 3 images — in Rosaceae

Prunus americana Marsh. — American plum, wild plum — 3 images — in Rosaceae

Prunus avium (L.) L. — sweet cherry — 20 images — in Rosaceae

Prunus cerasifera Ehrh. — cherry plum, myrobalan plum — 9 images — in Rosaceae

Prunus cerasus L. — sour cherry — 3 images — in Rosaceae

Prunus hortulana Bailey — wild goose plum — 2 images — in Rosaceae

Prunus incisa Thunb. — Fuji cherry — 10 images — in Rosaceae

Prunus mahaleb L. — mahaleb cherry — 4 images — in Rosaceae

Prunus maritima var. maritima Marsh. — beach plum — 62 images — in Rosaceae

Prunus nigra Aiton — Canada plum — 4 images — in Rosaceae

Prunus pensylvanica var. pensylvanica L.f. — pin cherry, fire cherry — 40 images — in Rosaceae

Prunus persica (L.) Batsch — peach — 28 images — in Rosaceae

Prunus pumila var. depressa (Pursh) Gleason — sand cherry, sandbar cherry — 7 images — in Rosaceae

Prunus serotina var. serotina Ehrh. — black cherry — 82 images — in Rosaceae

Prunus serrulata Lindley — Japanese flowering cherry — 13 images — in Rosaceae

Prunus susquehanae Willd. — Appalachian sand plum, Appalachian sand cherry — 34 images — in Rosaceae

Prunus virginiana var. melanocarpa (A.Nelson) Sarg. — black-fruited chokecherry — 3 images — in Rosaceae

Prunus virginiana var. virginiana L. — chokecherry — 51 images — in Rosaceae

Prunus ×cistena (N.E.Hansen) Koehne — purpleleaf sand cherry — 1 images — in Rosaceae

Pseudognaphalium obtusifolium (L.) Hilliard & B.L.Burtt — sweet everlasting, fragrant cudweed, blunt-leaved rabbit tobacco — 27 images — in Asteraceae

Pseudotsuga menziesii ssp. glauca (Beissn.) A.E.Murray — Rocky Mountain Douglas fir — 18 images — in Pinaceae

Pseudotsuga menziesii ssp. menziesii (Mirbel) Franco — coastal Douglas fir, Coast Douglas fir — 25 images — in Pinaceae

Psychrophila leptosepala (DC.) W.A.Weber — marsh marigold — 1 images — in Ranunculaceae

Ptelea trifoliata ssp. trifoliata var. trifoliata L. — common hoptree, stinking ash, wafer ash — 11 images — in Rutaceae

Pteridium aquilinum var. latiusculum (Desv.) L.Underw. ex A.Heller — bracken fern — 31 images — in Dennstaedtiaceae

Pteridium aquilinum var. pseudocaudatum (Clute) A.Heller — pinebarrens bracken fern — 5 images — in Dennstaedtiaceae

Ptilimnium capillaceum (Michx.) Raf. — Atlantic mock bishop's weed — 14 images — in Apiaceae

Puccinellia maritima (Hudson) Parl. — seaside alkaligrass — 5 images — in Poaceae

Pueraria montana var. lobata (Willd.) Maesen & S.Almeida — kudzu — 12 images — in Fabaceae

Pulmonaria saccharata Mill. — lungwort, Bethlehem sage — 11 images — in Boraginaceae

Puschkinia scilloides Adams — striped squill — 14 images — in Asphodelaceae

Pycnanthemum incanum var. incanum (L.) Michx. — hoary mountain mint — 5 images — in Lamiaceae

Pycnanthemum muticum (Michx.) Pers. — short-toothed mountain mint, clustered mountain mint — 34 images — in Lamiaceae

Pycnanthemum tenuifolium Schrader — slender-leaved mountain mint — 21 images — in Lamiaceae

Pycnanthemum verticillatum var. pilosum (Nutt.) Cooperrider — hairy whorled mountain mint — 4 images — in Lamiaceae

Pycnanthemum virginianum (L.) T.Durand & B.D.Jackson — Virginia mountain mint — 6 images — in Lamiaceae

Pyrola americana Sweet — round-leaved shinleaf, glossy shinleaf — 47 images — in Ericaceae

Pyrola asarifolia ssp. asarifolia Michx. — pink shinleaf — 2 images — in Ericaceae

Pyrola chlorantha Sw. — green-flowered shinleaf — 12 images — in Ericaceae

Pyrola elliptica Nutt. — elliptic shinleaf, large-leaved shinleaf, waxflower shinleaf — 25 images — in Ericaceae

Pyrularia pubera Michx. — Buffalo nut, oil nut — 33 images — in Santalaceae

Pyrus calleryana Dcne. — Callery pear, Bradford pear — 28 images — in Rosaceae

Pyrus communis L. — common European pear — 27 images — in Rosaceae

Pyrus pyrifolia (Burm.) Nakai — Asian pear, Japanese pear, Chinese pear — 3 images — in Rosaceae

Quercus alba L. — eastern white oak — 76 images — in Fagaceae

Quercus bicolor Willd. — swamp white oak — 63 images — in Fagaceae

Quercus cerris L. — Turkey oak — 24 images — in Fagaceae

Quercus coccinea Muenchh. — scarlet oak — 42 images — in Fagaceae

Quercus gambelii Nutt. — Gambel oak — 5 images — in Fagaceae

Quercus ilicifolia Wangenh. — scrub oak, bear oak — 94 images — in Fagaceae

Quercus marilandica Muenchh. — barren oak — 1 images — in Fagaceae

Quercus montana Willd. — chestnut oak — 37 images — in Fagaceae

Quercus muehlenbergii Engelm. — yellow oak, chinquapin oak — 1 images — in Fagaceae

Quercus palustris Muenchh. — pin oak — 31 images — in Fagaceae

Quercus prinoides Willd. — dwarf chestnut oak — 65 images — in Fagaceae

Quercus robur L. — English oak — 20 images — in Fagaceae

Quercus rubra L. — northern red oak — 61 images — in Fagaceae

Quercus stellata Wangenh. — post oak — 12 images — in Fagaceae

Quercus velutina Lam. — black oak — 52 images — in Fagaceae

Quercus ×bebbiana C.K.Schneider — Bebb's oak — 4 images — in Fagaceae

Quercus ×bimundorum Palmer — oak of two worlds — 4 images — in Fagaceae

Quercus ×saulii C.K.Schneider — Saul's oak — 13 images — in Fagaceae

Quercus ×stelloides Palmer — dwarf chestnut oak × post oak — 2 images — in Fagaceae

Ranunculus abortivus L. — kidney-leaved buttercup, small-flowered crowfoot — 31 images — in Ranunculaceae

Ranunculus acris L. — tall buttercup, tall crowfoot — 18 images — in Ranunculaceae

Ranunculus allegheniensis Britton — Allegheny buttercup, Allegheny crowfoot — 12 images — in Ranunculaceae

Ranunculus bulbosus L. — bulbous buttercup, bulbous crowfoot, St. Anthony's turnip — 34 images — in Ranunculaceae

Ranunculus fascicularis Muhl. ex Bigelow — early buttercup, early crowfoot — 9 images — in Ranunculaceae

Ranunculus flabellaris Raf. — yellow water buttercup, greater yellow water crowfoot — 11 images — in Ranunculaceae

Ranunculus micranthus Nutt. — small-flowered buttercup, small-flowered crowfoot — 8 images — in Ranunculaceae

Ranunculus recurvatus var. recurvatus Poiret — hooked buttercup, hooked crowfoot — 31 images — in Ranunculaceae

Ranunculus repens L. — creeping buttercup, creeping crowfoot, spot-leaved crowfoot — 30 images — in Ranunculaceae

Ranunculus sceleratus var. sceleratus L. — cursed buttercup, celery-leaved buttercup, cursed crowfoot, celery-leaved crowfoot — 10 images — in Ranunculaceae

Ranunculus trichophyllus Chaix ex Vill. — thread-leaved water crowfoot — 10 images — in Ranunculaceae

Raphanus raphanistrum L. — wild radish — 27 images — in Brassicaceae

Ratibida columnifera (Nutt.) Woot. & Standl. — long-headed coneflower, prarie coneflower, prairie Mexican hat — 1 images — in Asteraceae

Ratibida pinnata (Vent.) Barnh. — gray-headed prairie coneflower, gray-headed Mexican hat — 14 images — in Asteraceae

Reynoutria japonica var. compacta (Hook.f.) Buchheim — dwarf Japanese knotweed — 5 images — in Polygonaceae

Reynoutria japonica var. japonica Houtt. — Japanese knotweed — 37 images — in Polygonaceae

Reynoutria sachalinensis (F.Schmidt) Nakai — giant knotweed, Sakhalin knotweed — 11 images — in Polygonaceae

Reynoutria ×bohemica Chrtek & Chrtková — Bohemian knotweed — 37 images — in Polygonaceae

Rhamnus cathartica L. — European common buckthorn, purging buckthorn — 40 images — in Rhamnaceae

Rheum rhabarbarum L. — rhubarb — 5 images — in Polygonaceae

Rhexia virginica L. — Virginia meadowbeauty, northern meadowbeauty, wingstem meadowpitchers — 57 images — in Melastomataceae

Rhinanthus minor ssp. minor L. — little yellow rattle — 12 images — in Orobanchaceae

Rhodiola rhodantha (Gray) H. Jacobsen — redpod stonecrop, queen's crown — 1 images — in Crassulaceae

Rhododendron calendulaceum (Michx.) Torr. — flame azalea — 8 images — in Ericaceae

Rhododendron canadense (L.) Torrey — rhodora — 19 images — in Ericaceae

Rhododendron carolinianum Rehd. — Carolina rhododendron — 9 images — in Ericaceae

Rhododendron catawbiense Michx. — Catawba rhododendron — 19 images — in Ericaceae

Rhododendron kaempferi Planch. — Kaempfer's azalea, torch azalea — 6 images — in Ericaceae

Rhododendron maximum L. — great laurel, rosebay — 42 images — in Ericaceae

Rhododendron maximum × R. catawbiense — hybrid rhododendron — 3 images — in Ericaceae

Rhododendron periclymenoides (Michx.) Shinners — pink azalea — 8 images — in Ericaceae

Rhododendron prinophyllum (Small) Millais — early azalea — 17 images — in Ericaceae

Rhododendron vaseyi A.Gray — Vasey's azalea — 7 images — in Ericaceae

Rhododendron viscosum (L.) Torrey — swamp azalea — 42 images — in Ericaceae

Rhodotypos scandens (Thunb.) Makino — black jetbead, white kerria — 25 images — in Rosaceae

Rhus aromatica Aiton — fragrant sumac — 11 images — in Anacardiaceae

Rhus copallinum var. latifolia Engler — flameleaf sumac, winged sumac — 36 images — in Anacardiaceae

Rhus glabra L. — smooth sumac — 16 images — in Anacardiaceae

Rhus typhina L. — staghorn sumac — 32 images — in Anacardiaceae

Rhynchospora alba (L.) Vahl — white beakrush, white beaksedge — 30 images — in Cyperaceae

Rhynchospora capitellata (Michx.) Vahl — brownish beakrush, brownish beaksedge — 36 images — in Cyperaceae

Rhynchospora fusca (L.) Ait.f. — brown beaksedge, sooty beakrush — 8 images — in Cyperaceae

Rhynchospora inundata (Oakes) Fern. — narrow-fruited beaksedge, inundated hornsedge — 15 images — in Cyperaceae

Rhynchospora macrostachya Torrey ex A.Gray — big-headed hornsedge, tall beaksedge — 50 images — in Cyperaceae

Rhynchospora nitens (Vahl) A.Gray — short-beaked baldsedge, short-beaked beaksedge — 11 images — in Cyperaceae

Rhynchospora scirpoides (Torrey) A.Gray — long-beaked baldsedge, long-beaked beaksedge — 56 images — in Cyperaceae

Rhynchospora torreyana A.Gray — Torrey's beaksedge — 8 images — in Cyperaceae

Ribes americanum P.Miller — American black currant — 4 images — in Grossulariaceae

Ribes cereum Douglas — wax currant, squaw currant — 2 images — in Grossulariaceae

Ribes cynosbati L. — eastern prickly gooseberry, wild gooseberry — 18 images — in Grossulariaceae

Ribes glandulosum Grauer — skunk currant — 7 images — in Grossulariaceae

Ribes hirtellum Michx. — hairy-stemmed gooseberry, swamp gooseberry — 16 images — in Grossulariaceae

Ribes nigrum L. — European black currant, garden black currant — 4 images — in Grossulariaceae

Ribes rubrum L. — garden red currant — 17 images — in Grossulariaceae

Ribes uva-crispa var. sativum DC. — European gooseberry — 3 images — in Grossulariaceae

Ricinus communis L. — castor bean, castor oil plant — 5 images — in Euphorbiaceae

Robinia hispida var. hispida L. — bristly locust — 20 images — in Fabaceae

Robinia pseudoacacia L. — black locust — 39 images — in Fabaceae

Robinia viscosa var. viscosa Vent. — clammy locust — 8 images — in Fabaceae

Rorippa globosa (Turcz. ex Fisch. & Mey.) Hayek — round-fruited yellowcress — 4 images — in Brassicaceae

Rorippa palustris var. hispida (Desv.) Rydb. — hispid yellowcress — 34 images — in Brassicaceae

Rosa acicularis ssp. sayi (Schwein.) W.H.Lewis — northern prickly rose, bristly rose — 10 images — in Rosaceae

Rosa blanda var. blanda Aiton — smooth rose — 8 images — in Rosaceae

Rosa canina L. — dog rose — 16 images — in Rosaceae

Rosa carolina ssp. carolina L. — Carolina rose, pasture rose — 12 images — in Rosaceae

Rosa chinensis × R. multiflora (Polyantha Group) — multiflora rose hybrid — 17 images — in Rosaceae

Rosa cinnamomea L. — cinnamon rose — 4 images — in Rosaceae

Rosa gallica L. — French rose — 11 images — in Rosaceae

Rosa glauca Pourret — redleaf rose — 9 images — in Rosaceae

Rosa luciae Franch. & Rochebr. ex Crépin — memorial rose — 20 images — in Rosaceae

Rosa micrantha Borrer ex J.E.Smith — small-flowered rose, small-flowered sweetbriar — 11 images — in Rosaceae

Rosa multiflora Thunb. ex Murray — multiflora rose, rambler rose — 39 images — in Rosaceae

Rosa multiflora var. cathayensis Rehd. & E.H.Wilson — pink multiflora rose — 13 images — in Rosaceae

Rosa nitida Willd. — shiny rose, New England rose — 11 images — in Rosaceae

Rosa palustris Marsh. — swamp rose — 30 images — in Rosaceae

Rosa rubiginosa L. — sweetbriar, sweetbrier — 9 images — in Rosaceae

Rosa rugosa Thunb. — Japanese rose, saltspray rose, beach rose — 36 images — in Rosaceae

Rosa spinosissima L. — Scotch rose — 7 images — in Rosaceae

Rosa virginiana P.Miller — Virginia rose, low rose — 29 images — in Rosaceae

Rubus allegheniensis Porter — Allegheny blackberry, common blackberry — 34 images — in Rosaceae

Rubus arenicola Blanch. — New England sand blackberry, sandy field blackberry — 10 images — in Rosaceae

Rubus argutus Link — serrate blackberry, southern blackberry — 3 images — in Rosaceae

Rubus caesius L. — European forest blackberry, European dewberry — 9 images — in Rosaceae

Rubus enslenii Tratt. — southern dewberry, Enslen's blackberry — 4 images — in Rosaceae

Rubus flagellaris Willd. — northern dewberry — 32 images — in Rosaceae

Rubus hispidus L. — bristly dewberry — 45 images — in Rosaceae

Rubus idaeus ssp. strigosus (Michx.) Focke — wild red raspberry — 6 images — in Rosaceae

Rubus jaysmithii Bailey — Smith's blackberry — 20 images — in Rosaceae

Rubus laciniatus Willd. — cutleaf blackberry, evergreen blackberry — 23 images — in Rosaceae

Rubus occidentalis L. — black raspberry — 23 images — in Rosaceae

Rubus odoratus L. — flowering raspberry, thimbleberry — 14 images — in Rosaceae

Rubus parviflorus L. — western thimbleberry — 4 images — in Rosaceae

Rubus pensilvanicus Poiret — highbush blackberry, Pennsylvania blackberry — 6 images — in Rosaceae

Rubus phoenicolasius Maxim. — wine raspberry, wineberry — 10 images — in Rosaceae

Rubus pubescens Raf. — swamp dewberry, dwarf raspberry — 17 images — in Rosaceae

Rubus recurvicaulis Blanch. — arching sand blackberry — 7 images — in Rosaceae

Rubus setosus Bigelow — bristly blackberry — 7 images — in Rosaceae

Rudbeckia hirta var. pulcherrima Farw. — black-eyed Susan, black-eyed coneflower — 32 images — in Asteraceae

Rudbeckia laciniata var. laciniata L. — green-headed coneflower, tall coneflower — 5 images — in Asteraceae

Rudbeckia subtomentosa Pursh — sweet coneflower — 7 images — in Asteraceae

Rumex acetosella ssp. pyrenaicus (Pourr. ex Lapeyr.) Akeroyd — sheep dock, sheep sorrel, red sorrel — 25 images — in Polygonaceae

Rumex britannica L. — greater water dock — 25 images — in Polygonaceae

Rumex crispus ssp. crispus L. — curly dock — 27 images — in Polygonaceae

Rumex obtusifolius ssp. obtusifolius L. — redveined dock, bitter dock — 28 images — in Polygonaceae

Rumex pallidus Bigelow — seabeach dock, pale dock — 4 images — in Polygonaceae

Rumex triangulivalvis (Danser) Rech.f. — white dock, willowleaf dock — 4 images — in Polygonaceae

Rumex verticillatus L. — swamp dock — 18 images — in Polygonaceae

Ruppia maritima L. — ditchgrass, widgeongrass — 21 images — in Ruppiaceae

Sabatia campanulata (L.) Torrey — slender rose-gentian, slender marsh pink — 8 images — in Gentianaceae

Sabatia kennedyana Fern. — Plymouth gentian — 65 images — in Gentianaceae

Saccharum ravennae L. — Ravenna grass, elephant grass, hardy pampas grass, plume grass — 3 images — in Poaceae

Sagina decumbens ssp. decumbens (Ell.) Torrey & A.Gray — trailing pearlwort — 5 images — in Caryophyllaceae

Sagina procumbens L. — matted pearlwort, birdseye pearlwort — 12 images — in Caryophyllaceae

Sagina sp. — unidentified pearlwort — 3 images — in Caryophyllaceae

Sagittaria engelmanniana J.G.Smith — acid-water arrowhead, Engelmann's arrowhead — 29 images — in Alismataceae

Sagittaria filiformis J.G.Smith — threadleaf arrowhead, riffle arrowhead — 2 images — in Alismataceae

Sagittaria graminea var. graminea Michx. — grassleaf arrowhead — 6 images — in Alismataceae

Sagittaria latifolia Willd. — common arrowhead, duck potato — 34 images — in Alismataceae

Sagittaria subulata (L.) Buch. — river arrowhead — 3 images — in Alismataceae

Sagittaria teres S.Watson — pondshore arrowhead, terete arrowhead — 60 images — in Alismataceae

Salicornia ambigua Michx. — perennial glasswort — 46 images — in Amaranthaceae

Salicornia bigelovii Torrey — dwarf glasswort — 15 images — in Amaranthaceae

Salicornia depressa Standl. — annual glasswort, common glasswort — 27 images — in Amaranthaceae

Salix aegyptiaca L. [and/or its hybrids] — musk willow, Persian willow — 15 images — in Salicaceae

Salix alba L. — white willow — 12 images — in Salicaceae

Salix atrocinerea Brotero — rusty willow — 119 images — in Salicaceae

Salix atrocinerea/cinerea s.l. complex — rusty and ash willow with hybrids — 26 images — in Salicaceae

Salix atrocinerea/cinerea × S. bebbiana — rusty/ash willow × Bebb's willow — 24 images — in Salicaceae

Salix atrocinerea/cinerea × S. discolor — rusty or ash willow × American pussy willow — 8 images — in Salicaceae

Salix atrocinerea/cinerea × S. humilis — rusty/ash willow × upland willow — 13 images — in Salicaceae

Salix atrocinerea/cinerea × S. occidentalis — rusty/ash willow × dwarf upland willow — 5 images — in Salicaceae

Salix aurita L. — eared willow — 11 images — in Salicaceae

Salix bebbiana Sarg. — Bebb's willow — 41 images — in Salicaceae

Salix brachycarpa Nutt. — barren-ground willow — 2 images — in Salicaceae

Salix candida Fluegge ex Willd. — hoary willow, long-beaked willow — 19 images — in Salicaceae

Salix caprea L. — goat willow — 9 images — in Salicaceae

Salix cinerea L. — ash willow — 44 images — in Salicaceae

Salix discolor Muhl. — American pussy willow — 82 images — in Salicaceae

Salix drummondiana Barratt ex Hooker — Drummond's willow — 3 images — in Salicaceae

Salix eleagnos Scop. — olive willow, rosemary willow — 3 images — in Salicaceae

Salix eriocephala Michx. — heartleaf willow, diamond willow — 61 images — in Salicaceae

Salix euxina Belyaeva — West Asian willow — 18 images — in Salicaceae

Salix exigua ssp. exigua — sandbar willow — 6 images — in Salicaceae

Salix exigua ssp. interior (Rowlee) Cronq. — sandbar willow — 14 images — in Salicaceae

Salix glauca L. — glaucous willow — 2 images — in Salicaceae

Salix gracilistyla Miq. — rose-gold pussy willow — 6 images — in Salicaceae

Salix humilis Marsh. — prairie willow, upland willow — 86 images — in Salicaceae

Salix integra 'Hakuro Nishiki' — variegated entireleaf willow, dappled willow — 2 images — in Salicaceae

Salix lasiandra var. caudata (Nutt.) Sudworth — tail-leaf willow — 10 images — in Salicaceae

Salix lucida Muhl. — shining willow — 22 images — in Salicaceae

Salix monticola Bebb — mountain willow — 3 images — in Salicaceae

Salix myrsinifolia Sm. — dark-leaved willow, myrsine-leaved willow — 5 images — in Salicaceae

Salix nigra Marsh. — black willow — 69 images — in Salicaceae

Salix nivalis Hooker — snow willow — 1 images — in Salicaceae

Salix occidentalis Walter — dwarf upland willow, dwarf prairie willow — 89 images — in Salicaceae

Salix pedicellaris Pursh — bog willow — 37 images — in Salicaceae

Salix pentandra L. — bay willow — 13 images — in Salicaceae

Salix pentandra × S. ×fragilis — hybrid willow — 25 images — in Salicaceae

Salix petiolaris J.E.Smith — slender willow, meadow willow — 44 images — in Salicaceae

Salix phylicifolia L. — tea-leaved willow — 1 images — in Salicaceae

Salix purpurea L. — basket willow — 17 images — in Salicaceae

Salix purpurea × S. viminalis — green-leaved willow, red osier — 2 images — in Salicaceae

Salix scouleriana Barratt ex Hooker — Scouler's willow — 6 images — in Salicaceae

Salix sericea Marsh. — silky willow — 48 images — in Salicaceae

Salix serissima (Bailey) Fern. — autumn willow — 31 images — in Salicaceae

Salix viminalis L. — common osier — 7 images — in Salicaceae

Salix ×conifera Wangenh. (pro sp.) — cone-bearing willow (pussy willow × upland willow) — 9 images — in Salicaceae

Salix ×fragilis L. pro sp. — brittle willow (white willow × West Asian willow) — 24 images — in Salicaceae

Salix ×jesupii Fern. — Jesup's willow (white willow × shining willow) — 16 images — in Salicaceae

Salix ×meyeriana Rostk. — Meyer's willow (bayleaf willow × West Asian willow) — 5 images — in Salicaceae

Salix ×sepulcralis auct. — golden weeping willow (white willow × Babylon willow) — 25 images — in Salicaceae

Salix ×smithiana Willd. — Smith's willow (ash willow × basket willow) — 9 images — in Salicaceae

Salsola kali ssp. kali L. — prickly saltwort, seabeach saltwort — 30 images — in Amaranthaceae

Salsola tragus L. — Russian thistle, windwitch — 2 images — in Amaranthaceae

Salvia nemorosa L. — woodland sage — 2 images — in Lamiaceae

Salvia officinalis L. — medicinal sage — 2 images — in Lamiaceae

Sambucus nigra ssp. canadensis (L.) R.Bolli — American black elderberry, American black-fruited elderberry — 28 images — in Adoxaceae

Sambucus racemosa L. — red elderberry, red-berried elderberry — 11 images — in Adoxaceae

Samolus valerandi ssp. parviflorus (Raf.) Hultén — seaside brookweed, water pimpernel — 18 images — in Primulaceae

Sanguinaria canadensis L. — bloodroot — 22 images — in Papaveraceae

Sanguisorba canadensis L. — Canada burnet, American burnet — 5 images — in Rosaceae

Sanguisorba minor ssp. balearica (Bourg. ex Nyman) M.Garm. & C.Navarro — garden burnet, salad burnet — 10 images — in Rosaceae

Sanicula canadensis var. canadensis L. — black snakeroot, Canada snakeroot, Canadian sanicle — 6 images — in Apiaceae

Sanicula marilandica L. — Maryland black snakeroot, Maryland sanicle — 21 images — in Apiaceae

Saponaria officinalis L. — common soapwort, soapweed, bouncing bet — 22 images — in Caryophyllaceae

Sarracenia purpurea L. — purple pitcherplant — 38 images — in Sarraceniaceae

Sasa cf.palmata — broad-leaf bamboo — 2 images — in Poaceae

Sassafras albidum (Nutt.) Nees — sassafras — 77 images — in Lauraceae

Saxifraga bronchialis L. — matte saxifrage, spotted saxifrage — 2 images — in Saxifragaceae

Sceptridium dissectum (Spreng.) Lyon — cut-leaved grapefern, dissected grapefern — 9 images — in Ophioglossaceae

Sceptridium oneidense (Gilbert) Holub — blunt-lobed grapefern — 24 images — in Ophioglossaceae

Schedonorus arundinaceus (Schreber) Dumort. — tall fescue, tall ryegrass — 10 images — in Poaceae

Schedonorus pratensis (Hudson) Beauv. — meadow fescue, meadow ryegrass — 5 images — in Poaceae

Scheuchzeria palustris L. — podgrass — 21 images — in Scheuchzeriaceae

Schizachyrium scoparium var. scoparium (Michx.) Nash — little bluestem — 25 images — in Poaceae

Schoenoplectiella smithii var. setosa (Fernald) Hayas. — bristly Smith's clubsedge, bristly Smith's bulrush — 13 images — in Cyperaceae

Schoenoplectus acutus var. acutus (Muhl. ex Bigel.) A.Löve & D.Löve — hard-stemmed bulrush — 6 images — in Cyperaceae

Schoenoplectus americanus (Pers.) Volk. ex Schinz & R.Keller — saltmarsh threesquare, Olney's threesquare, chairmaker's bulrush — 9 images — in Cyperaceae

Schoenoplectus pungens var. pungens (Vahl) Palla — common threesquare, threesquare bulrush — 32 images — in Cyperaceae

Schoenoplectus subterminalis (Torrey) Soják — water bulrush, floating bulrush — 29 images — in Cyperaceae

Schoenoplectus tabernaemontani (K.C.Gmelin) Palla — softstem bulrush — 20 images — in Cyperaceae

Scirpus atrocinctus Fern. — black-girdled woolsedge, dusky woolgrass — 2 images — in Cyperaceae

Scirpus atrovirens Willd. — dark green bulrush, dark green bulsedge — 4 images — in Cyperaceae

Scirpus cyperinus (L.) Kunth — common bulrush, common woolsedge, common woolgrass — 33 images — in Cyperaceae

Scirpus expansus Fern. — spreading bulrush, wood bulrush — 4 images — in Cyperaceae

Scirpus georgianus Harper — black bulrush, Georgia bulrush — 6 images — in Cyperaceae

Scirpus hattorianus Makino — meadow bulrush, mosquito bulrush — 12 images — in Cyperaceae

Scirpus longii Fernald — Long's bulrush, Long's woosedge, Long's woolgrass — 6 images — in Cyperaceae

Scirpus microcarpus J.Presl & C.Presl — red-stemmed bulrush — 2 images — in Cyperaceae

Scirpus pedicellatus Fern. — stalked bulrush, stalked woolsedge, stalked woolgrass — 10 images — in Cyperaceae

Scirpus ×peckii Britton — Peck's bulrush — 15 images — in Cyperaceae

Scleranthus annuus L. — annual knawel — 14 images — in Caryophyllaceae

Scleranthus perennis L. — perennial knawel — 5 images — in Caryophyllaceae

Scleria pauciflora var. caroliniana (Willd.) Wood — shaggy few-flowered nutsedge, Carolina papillose nutrush — 23 images — in Cyperaceae

Scleria reticularis Michx. — pondshore nutsedge, netted nutsedge — 39 images — in Cyperaceae

Scorzoneroides autumnalis ssp. autumnalis (L.) Moensch — fall dandelion, hawkbit — 27 images — in Asteraceae

Scrophularia lanceolata Pursh — lance-leaved figwort, American figwort — 20 images — in Scrophulariaceae

Scrophularia marilandica L. — eastern figwort, Maryland figwort — 7 images — in Scrophulariaceae

Scrophularia nodosa L. — woodland figwort, wood figwort — 7 images — in Scrophulariaceae

Scutellaria galericulata L. — marsh scullcap, common scullcap — 12 images — in Lamiaceae

Scutellaria lateriflora L. — mad-dog skullcap, blue skullcap — 16 images — in Lamiaceae

Secale cereale L. — cultivated rye — 15 images — in Poaceae

Securigera varia (L.) Lassen — purple crownvetch — 9 images — in Fabaceae

Sedum acre L. — moss stonecrop, goldmoss stonecrop — 5 images — in Crassulaceae

Sedum album L. — white stonecrop — 10 images — in Crassulaceae

Sedum reflexum L. — rock stonecrop — 7 images — in Crassulaceae

Sedum sarmentosum Bunge — stringy stonecrop, running stonecrop — 6 images — in Crassulaceae

Sedum sexangulare L. — six-angled stonecrop, creeping stonecrop — 4 images — in Crassulaceae

Selaginella apoda (L.) Spring — meadow spikemoss — 9 images — in Selaginellaceae

Selaginella rupestris (L.) Spring — rock spikemoss — 21 images — in Selaginellaceae

Sempervivum tectorum L. — common houseleek, hens-and-chicks, hen-and-chickens — 3 images — in Crassulaceae

Senecio atratus Greene — tall blacktip ragwort — 1 images — in Asteraceae

Senecio vulgaris L. — common groundsel, common ragwort — 14 images — in Asteraceae

Senna hebecarpa (Fern.) Irwin & Barneby — northern wild senna — 33 images — in Fabaceae

Sericocarpus asteroides (L.) B.S.P. — toothed white-topped aster — 26 images — in Asteraceae

Sericocarpus linifolius (L.) B.S.P. — narrow-leaved white-topped aster — 14 images — in Asteraceae

Setaria faberi R.A.W.Herrm. ex Rosen — Chinese foxtail, giant foxtail, nodding foxtail — 21 images — in Poaceae

Setaria parviflora (Poiret) Kerguélen — knotroot foxtail, bristly foxtail — 4 images — in Poaceae

Setaria pumila ssp. pumila (Poir.) Roemer & J.A.Schultes — yellow foxtail — 35 images — in Poaceae

Setaria viridis (L.) Beauv. — green foxtail — 11 images — in Poaceae

Shortia galacifolia Torr. & A.Gray — Oconee bells — 10 images — in Diapensiaceae

Sibbaldiopsis tridentata (Aiton) Rydb. — three-toothed cinquefoil — 12 images — in Rosaceae

Sicyos angulatus L. — one-seeded bur cucumber — 14 images — in Cucurbitaceae

Silene antirrhina L. — sleepy catchfly, sleepy campion — 11 images — in Caryophyllaceae

Silene caroliniana ssp. pensylvanica (Michx.) Clausen — Pennsylvania catchfly, wild campion — 10 images — in Caryophyllaceae

Silene dichotoma Ehrh. — forked campion, forking catchfly — 9 images — in Caryophyllaceae

Silene dioica (L.) Clairville — red campion — 1 images — in Caryophyllaceae

Silene latifolia ssp. alba (P.Mill.) Greuter & Burdet — white campion, evening lychnis — 24 images — in Caryophyllaceae

Silene vulgaris ssp. vulgaris (Moench) Garcke — bladder campion — 8 images — in Caryophyllaceae

Silphium perfoliatum L. — cup plant — 16 images — in Asteraceae

Sisymbrium altissimum L. — tumbling hedge mustard — 11 images — in Brassicaceae

Sisymbrium loeselii L. — Loesel's hedge mustard, tall hedge mustard — 5 images — in Brassicaceae

Sisymbrium officinale (L.) Scop. — common hedge mustard — 12 images — in Brassicaceae

Sisyrinchium angustifolium P.Miller — narrow-leaved blue-eyed grass, stout blue-eyed grass — 27 images — in Iridaceae

Sisyrinchium atlanticum Bicknell — eastern blue-eyed grass — 4 images — in Iridaceae

Sisyrinchium fuscatum Bicknell — sandplain blue-eyed grass, coastal plain blue-eyed grass — 5 images — in Iridaceae

Sisyrinchium montanum var. crebrum Fern. — strict blue-eyed grass, meadow blue-eyed grass — 10 images — in Iridaceae

Sium suave Walter — water parsnip — 19 images — in Apiaceae

Smilax glauca Walter — sawbrier, wild sarsaparilla, glaucous-leaved greenbrier — 30 images — in Smilacaceae

Smilax herbacea L. — carrion flower, smooth herbaceous greenbrier — 24 images — in Smilacaceae

Smilax rotundifolia L. — catbrier, bullbrier, common greenbrier — 33 images — in Smilacaceae

Solanum carolinense var. carolinense L. — Carolina nightshade, Carolina horsenettle — 23 images — in Solanaceae

Solanum dulcamara var. dulcamara L. — climbing nightshade, bittersweet nightshade, deadly nightshade — 25 images — in Solanaceae

Solanum dulcamara var. villosissimum Desv. — hairy bittersweet nightshade, hairy deadly nightshade — 5 images — in Solanaceae

Solanum emulans Raf. — eastern black nightshade — 18 images — in Solanaceae

Solanum lycopersicon var. lycopersicon L. — garden tomato — 8 images — in Solanaceae

Solanum melongena L. — eggplant — 3 images — in Solanaceae

Solanum nigrum ssp. nigrum L. — European black nightshade — 6 images — in Solanaceae

Solanum physalifolium var. nitidibaccatum (Bitter) Edmonds — viscid nightshade, groundcherry nightshade, hoe nightshade — 3 images — in Solanaceae

Solanum rostratum Dunal — horned nightshade, buffalobur nightshade, buffalobur — 11 images — in Solanaceae

Solanum sisymbriifolium Lam. — sticky nightshade — 3 images — in Solanaceae

Solidago aestivalis Bicknell — sphagnum goldenrod, swamp wrinkle-leaved goldenrod — 25 images — in Asteraceae

Solidago altissima ssp. altissima L. — tall goldenrod — 18 images — in Asteraceae

Solidago arguta var. arguta Aiton — forest goldenrod, sharp-leaved goldenrod, cutleaf goldenrod, Atlantic goldenrod — 10 images — in Asteraceae

Solidago bicolor L. — silverrod, white goldenrod — 27 images — in Asteraceae

Solidago caesia var. caesia L. — wreath goldenrod, bluestem goldenrod, axillary goldenrod — 19 images — in Asteraceae

Solidago canadensis var. canadensis L. — Canada goldenrod — 14 images — in Asteraceae

Solidago flexicaulis L. — zigzag goldenrod — 9 images — in Asteraceae

Solidago gigantea Aiton — smooth goldenrod, late goldenrod — 22 images — in Asteraceae

Solidago juncea Aiton — early goldenrod — 20 images — in Asteraceae

Solidago latissimifolia P.Miller — Elliott's goldenrod — 28 images — in Asteraceae

Solidago nemoralis ssp. nemoralis Ait. — gray goldenrod — 21 images — in Asteraceae

Solidago odora ssp. odora Aiton — licorice goldenrod, sweet goldenrod — 38 images — in Asteraceae

Solidago patula var. patula Muhl. ex Willd. — rough-leaved goldenrod — 4 images — in Asteraceae

Solidago patula var. strictula Torrey & A.Gray — roundleaf goldenrod — 6 images — in Asteraceae

Solidago puberula var. puberula Nutt. — downy goldenrod — 20 images — in Asteraceae

Solidago rugosa ssp. aspera (Aiton) Cronq. — southern rough-stemmed goldenrod, barrens goldenrod — 10 images — in Asteraceae

Solidago rugosa ssp. rugosa P.Miller — common rough-stemmed goldenrod, common wrinkle-leaved goldenrod — 29 images — in Asteraceae

Solidago sempervirens ssp. sempervirens L. — seaside goldenrod — 50 images — in Asteraceae

Solidago simplex var. simplex Kunth — sticky goldenrod — 2 images — in Asteraceae

Solidago speciosa var. speciosa Nutt. — showy goldenrod — 2 images — in Asteraceae

Solidago uliginosa Nutt. — swamp goldenrod — 16 images — in Asteraceae

Solidago ulmifolia var. ulmifolia Muhl. ex Willd. — elmleaf goldenrod — 30 images — in Asteraceae

Sonchus arvensis var. arvensis L. — field sowthistle, corn sowthistle — 8 images — in Asteraceae

Sonchus asper (L.) Hill — spiny-leaved sowthistle, spiny sowthistle — 14 images — in Asteraceae

Sonchus oleraceus L. — annual sowthistle, common thowthistle — 16 images — in Asteraceae

Sorbaria arborea C.K.Schneid. — tree false spirea — 7 images — in Rosaceae

Sorbaria sorbifolia (L.) A.Braun — false spirea — 11 images — in Rosaceae

Sorbus alnifolia (Siebold & Zucc.) K.Koch — alder-leaved mountain ash, Korean mountain ash — 2 images — in Rosaceae

Sorbus americana Marsh. — American mountain ash — 13 images — in Rosaceae

Sorbus aucuparia L. — European mountain ash — 40 images — in Rosaceae

Sorghastrum nutans (L.) Nash — Indian grass — 22 images — in Poaceae

Sparganium americanum Nutt. — common bur-reed, American bur-reed — 33 images — in Typhaceae

Sparganium emersum var. emersum Rehmann — green-fruited bur-reed, simple-stemmed bur-reed, emergent bur-reed — 14 images — in Typhaceae

Sparganium eurycarpum Engelm. ex A.Gray — giant bur-reed, great bur-reed — 10 images — in Typhaceae

Spartina alterniflora Loisel — saltwater cordgrass, smooth cordgrass — 32 images — in Poaceae

Spartina cynosuroides (L.) Roth — big cordgrass, salt reedgrass — 15 images — in Poaceae

Spartina patens var. patens (Aiton) Muhl. — saltmeadow cordgrass, salthay — 23 images — in Poaceae

Spartina pectinata Link — freshwater cordgrass, prairie cordgrass — 41 images — in Poaceae

Spergula arvensis L. — corn spurry — 5 images — in Caryophyllaceae

Spergula morisonii Boreau — Morison's spurry — 33 images — in Caryophyllaceae

Spergularia marina (L.) Griseb. — saltmarsh sand spurry — 16 images — in Caryophyllaceae

Spergularia rubra (L.) J.Presl & K.Presl — common sand spurry, red sand spurry — 13 images — in Caryophyllaceae

Sphenopholis pensylvanica (L.) A.S.Hitchc. — swamp wedgescale, swamp oats — 7 images — in Poaceae

Spinulum annotinum (L.) A.Haines — stiff clubmoss, bristly clubmoss — 9 images — in Lycopodiaceae

Spiraea alba var. latifolia (Aiton) Dippel — broad-leaved white meadowsweet — 25 images — in Rosaceae

Spiraea betulifolia Pall. — birchleaf spirea, white meadowsweet — 5 images — in Rosaceae

Spiraea japonica var. fortunei (Planch.) Rehd. — Japanese meadowsweet — 7 images — in Rosaceae

Spiraea prunifolia Sieb. & Zucc. — bridalwreath meadowsweet — 7 images — in Rosaceae

Spiraea thunbergii Sieb. — Thunberg's meadowsweet — 13 images — in Rosaceae

Spiraea tomentosa L. — steeplebush, rosy meadowsweet — 18 images — in Rosaceae

Spiraea ×vanhouttei (Briott) Carr. — Vanhoutte spirea, bridalwreath — 8 images — in Rosaceae

Spiranthes cernua (L.) L.C.Rich. — nodding ladies' tresses — 20 images — in Orchidaceae

Spiranthes lacera var. lacera (Raf.) Raf. — northern slender ladies' tresses — 5 images — in Orchidaceae

Spiranthes ochroleuca (Rydb.) Rydb. — yellow ladies' tresses — 6 images — in Orchidaceae

Spiranthes tuberosa Raf. — little ladies' tresses — 10 images — in Orchidaceae

Spirodela polyrrhiza (L.) Schleiden — greater duckweed, common duckmeal — 7 images — in Araceae

Sporobolus vaginiflorus var. vaginiflorus (Torrey ex A.Gray) Wood — poverty dropseed, poverty grass — 12 images — in Poaceae

Stachys hispida Pursh — hispid hedgenettle, hairy hedgenettle — 15 images — in Lamiaceae

Stachys hyssopifolia Michx. — hyssop-leaved hedgenettle, rough hedgenettle — 39 images — in Lamiaceae

Stachys palustris L. — Eurasian marsh hedgenettle, clown's woundwort — 7 images — in Lamiaceae

Staphylea trifolia L. — American bladdernut — 4 images — in Staphyleaceae

Stellaria graminea L. — grass-leaved stitchwort, field stitchwort, common stitchwort — 29 images — in Caryophyllaceae

Stellaria longifolia var. longifolia Muhl. ex Willd. — long-leaved stitchwort, long-leaved starwort — 6 images — in Caryophyllaceae

Stellaria media (L.) Vill. — common chickweed — 30 images — in Caryophyllaceae

Stewartia pseudocamellia Maxim. — Japanese stewartia — 3 images — in Theaceae

Streptopus lanceolatus (Aiton) Reveal — sessile-leaved twisted-stalk, rose twisted-stalk, rose mandarin, rosybells — 25 images — in Liliaceae

Strophostyles helvola (L.) Ell. — annual sand bean, annual woolly bean, trailing fuzzy bean — 23 images — in Fabaceae

Stuckenia pectinata (L.) Boerner — sago pondweed, sago false pondweed — 8 images — in Potamogetonaceae

Stylophorum diphyllum (Michx.) Nutt. — celandine poppy — 14 images — in Papaveraceae

Styphnolobium japonicum (L.) Schott. — Japanese pagoda tree, Chinese scholar tree — 6 images — in Fabaceae

Styrax japonicus Siebold & Zucc. — Japanese snowbell — 9 images — in Styracaceae

Suaeda calceoliformis (Hooker) Moq. — American sea blite — 8 images — in Amaranthaceae

Suaeda linearis (Ell.) Moq. — annual sea blite, erect sea blite, slender sea blite — 9 images — in Amaranthaceae

Suaeda maritima ssp. maritima (L.) Dumort. — saltmarsh sea blite, herbaceous sea blite — 25 images — in Amaranthaceae

Suaeda maritima ssp. richii (Fern.) Bassett & C.W.Crompton — Rich's sea blite — 4 images — in Amaranthaceae

Swida alternifolia (L.f.) Small — pagoda dogwood, alternate-leaved dogwood — 30 images — in Cornaceae

Swida amomum var. amomum (P.Miller) Small — silky dogwood — 16 images — in Cornaceae

Swida amomum var. schuetzeana (C.A.Mey.) A.Haines — oblique-leaf silky dogwood, pale silky dogwood — 25 images — in Cornaceae

Swida racemosa (Lam.) Moldenke — gray dogwood — 24 images — in Cornaceae

Swida rugosa (Lam.) Rydb. — round-leaved dogwood, talus dogwood — 6 images — in Cornaceae

Swida sanguinea (L.) Opiz — blood-twig dogwood, European common dogwood — 4 images — in Cornaceae

Swida sericea (L.) Holub — red osier, red-stemmed dogwood — 7 images — in Cornaceae

Symphoricarpos albus ssp. laevigatus (Fern.) Hultén — western snowberry — 6 images — in Caprifoliaceae

Symphoricarpos occidentalis Hooker — wolfberry — 9 images — in Caprifoliaceae

Symphoricarpos orbiculatus Moench — coralberry, red snowberry — 6 images — in Caprifoliaceae

Symphoricarpos oreophilus A.Gray — mountain snowberry — 1 images — in Caprifoliaceae

Symphyotrichum cordifolium (L.) G.L.Nesom — blue heartleaf aster — 15 images — in Asteraceae

Symphyotrichum dumosum (L.) G.L.Nesom — long-stalked aster, bushy aster, rice-button aster — 15 images — in Asteraceae

Symphyotrichum ericoides var. ericoides (L.) G.L.Nesom — heath white aster, squarrose white aster — 11 images — in Asteraceae

Symphyotrichum laeve var. laeve (L.) A.Löve & D.Löve — smooth aster — 14 images — in Asteraceae

Symphyotrichum lanceolatum ssp. lanceolatum var. lanceolatum (Willd.) G.L.Nesom — tall white aster, panicled aster — 2 images — in Asteraceae

Symphyotrichum lateriflorum (L.) A.Löve & D.Löve — calico aster, goblet aster — 22 images — in Asteraceae

Symphyotrichum novae-angliae (L.) G.L.Nesom — New England aster — 25 images — in Asteraceae

Symphyotrichum novi-belgii var. novi-belgii (L.) G.L.Nesom — New York aster — 49 images — in Asteraceae

Symphyotrichum patens var. patens (Aiton) G.L.Nesom — clasping aster, skydrops, skydrop aster — 20 images — in Asteraceae

Symphyotrichum pilosum var. pilosum (Willd.) G.L.Nesom — white oldfield aster, hairy aster, awl aster — 49 images — in Asteraceae

Symphyotrichum pilosum var. pringlei (A.Gray) G.L.Nesom — Pringle's aster — 19 images — in Asteraceae

Symphyotrichum puniceum var. puniceum (L.) A.Löve & D.Löve — bristly aster, swamp aster, purple-stemmed ater — 37 images — in Asteraceae

Symphyotrichum racemosum (Ell.) G.L.Nesom — smooth white oldfield aster — 10 images — in Asteraceae

Symphyotrichum subulatum var. subulatum (Michx.) G.L.Nesom — annual saltmarsh aster, small-flowered saltmarsh aster — 15 images — in Asteraceae

Symphyotrichum tenuifolium var. tenuifolium (L.) G.L.Nesom — perennial saltmarsh aster, large-flowered saltmarsh aster — 31 images — in Asteraceae

Symphyotrichum undulatum (L.) G.L.Nesom — clasping hartleaf aster, wavyleaf aster — 31 images — in Asteraceae

Symphytum asperum Lepechin — prickly comfrey — 4 images — in Boraginaceae

Symphytum officinale L. — common comfrey — 4 images — in Boraginaceae

Symplocarpus foetidus (L.) Salisb. ex Nutt. — skunk cabbage — 44 images — in Araceae

Symplocos paniculata (Thunb.) Miq. — Asiatic sweetleaf, sapphireberry — 8 images — in Symplocaceae

Syringa reticulata ssp. reticulata (Blume) Hara — Amur tree lilac — 4 images — in Oleaceae

Syringa vulgaris L. — common lilac — 7 images — in Oleaceae

Tagetes erecta L. — Aztec marigold, big marigold — 3 images — in Asteraceae

Tamarix chinensis Loureiro — five-stamen tamarisk, saltcedar — 11 images — in Tamaricaceae

Tanacetum parthenium (L.) Sch.Bip. — feverfew tansy — 7 images — in Asteraceae

Tanacetum vulgare L. — common tansy — 16 images — in Asteraceae

Taraxacum laevigatum (Willd.) DC. — red-seeded dandelion — 7 images — in Asteraceae

Taraxacum latilobum DC. — broad-lobed dandelion — 4 images — in Asteraceae

Taraxacum officinale G.H.Weber ex Wiggers — common dandelion — 28 images — in Asteraceae

Tarenaya hassleriana (Chod.) Iltis — Hassler's beeplant, Hassler's spiderflower — 8 images — in Cleomaceae

Taxus baccata L. — English yew — 6 images — in Taxaceae

Taxus canadensis var. canadensis Marsh. — Canada yew — 25 images — in Taxaceae

Taxus cuspidata Sieb. & Zucc. — Japanese yew — 11 images — in Taxaceae

Teesdalia nudicaulis (L.) Ait.f. — common shepherd's cress — 43 images — in Brassicaceae

Tephrosia virginiana (L.) Pers. — goat's rue, rabbit pea — 21 images — in Fabaceae

Teucrium canadense var. canadense L. — American germander, saltmarsh germander — 15 images — in Lamiaceae

Teucrium canadense var. occidentale (A.Gray) McClintock & Epling — glandular American germander, western American germander — 9 images — in Lamiaceae

Thalictrum dioicum L. — early meadowrue — 24 images — in Ranunculaceae

Thalictrum pubescens Pursh — tall meadowrue — 27 images — in Ranunculaceae

Thalictrum revolutum DC. — waxy-leaved meadowrue, skunk meadowrue — 26 images — in Ranunculaceae

Thalictrum thalictroides (L.) Eames & Boivin — anemone meadowrue, rue anemone — 9 images — in Ranunculaceae

Thelypteris palustris ssp. pubescens (Lawson) Fraser-Jenkins — American marsh fern — 33 images — in Thelypteridaceae

Thermopsis villosa (Walter) Fern. & Schubert — hairy bushpea, Blue Ridge false lupine — 5 images — in Fabaceae

Thinopyrum pycnanthum (Pers.) Barkworth — seabeach quackgrass, tick quackgrass — 5 images — in Poaceae

Thlaspi arvense L. — field pennycress — 35 images — in Brassicaceae

Thuja occidentalis L. — northern white cedar, arborvitae, arbor vitae — 15 images — in Cupressaceae

Thymus pulegioides L. — European broad-leaved thyme, lemon thyme — 11 images — in Lamiaceae

Tiarella stolonifera G.L.Nesom — foamflower — 27 images — in Saxifragaceae

Tilia americana var. americana L. — basswood, American linden — 49 images — in Malvaceae

Tilia cordata P.Miller — small-leaved linden, small-leaved lime, littleleaf linden — 16 images — in Malvaceae

Tilia cordata × T. mongolica — small-leaved linden × Mongolian linden — 6 images — in Malvaceae

Tilia ×vulgaris Hayne — common lime — 2 images — in Malvaceae

Torreyochloa pallida var. fernaldii (A.S.Hitchc.) Dore ex Koyama & Kawano — slender mannagrass, Fernald's mannagrass — 17 images — in Poaceae

Torreyochloa pallida var. pallida (Torrey) Church — pale mannagrass, Torrey's mannagrass — 11 images — in Poaceae

Toxicodendron radicans (L.) Kuntze — poison ivy — 56 images — in Anacardiaceae

Toxicodendron rydbergii (Small ex Rydb.) Greene — creeping poison ivy, western poison ivy — 5 images — in Anacardiaceae

Toxicodendron vernix (L.) Kuntze — poison sumac — 31 images — in Anacardiaceae

Tradescantia ohiensis Raf. — smooth spiderwort — 1 images — in Commelinaceae

Tradescantia ohiensis × T. virginiana — smooth spiderwort × Virginia spiderwort — 20 images — in Commelinaceae

Tradescantia virginiana L. — Virginia spiderwort — 8 images — in Commelinaceae

Tragopogon dubius Scop. — pale goat's beard — 22 images — in Asteraceae

Tragopogon pratensis L. — yellow goat's beard, meadow goat's beard — 2 images — in Asteraceae

Trapa natans L. — water chestnut, water caltrop — 18 images — in Lythraceae

Triadenum virginicum (L.) Raf. — Virginia marsh St. John's-wort — 29 images — in Hypericaceae

Trichophorum planifolium (Spreng.) Palla — woodland clubsedge, woodland bulrush — 20 images — in Cyperaceae

Trichostema dichotomum L. — forked bluecurls — 29 images — in Lamiaceae

Trifolium arvense L. — rabbitfoot clover — 17 images — in Fabaceae

Trifolium aureum L. — golden clover, palmate hopclover — 9 images — in Fabaceae

Trifolium campestre Schreber — pinnate hopclover — 6 images — in Fabaceae

Trifolium dubium Sibth. — lesser hopclover, little hopclover — 10 images — in Fabaceae

Trifolium hybridum L. — Alsike clover — 9 images — in Fabaceae

Trifolium incarnatum L. — crimson clover — 8 images — in Fabaceae

Trifolium pratense L. — red clover — 11 images — in Fabaceae

Trifolium pratense var. villosum DC. — hairy red clover — 7 images — in Fabaceae

Trifolium repens L. — white clover — 18 images — in Fabaceae

Triglochin maritima L. — saltmarsh arrowgrass — 25 images — in Juncaginaceae

Trillium cernuum var. cernuum L. — nodding trillium, nodding wakerobin — 20 images — in Melanthiaceae

Trillium cuneatum Raf. — little sweet Betsy — 7 images — in Melanthiaceae

Trillium erectum L. — red trillium, purple trillium, red wakerobin — 31 images — in Melanthiaceae

Trillium grandiflorum (Michx.) Salisb. — white trillium, white wakerobin — 3 images — in Melanthiaceae

Trillium simile Gleason — jeweled wakerobin — 5 images — in Melanthiaceae

Trillium undulatum Willd. — painted trillium, painted wakerobin — 15 images — in Melanthiaceae

Triodanis perfoliata (L.) Nieuwl. — Venus' looking glass, clasping bellflower — 16 images — in Campanulaceae

Triosteum aurantiacum var. aurantiacum Bicknell — orange-fruited horse gentian, early horse gentian, wild coffee — 21 images — in Caprifoliaceae

Triplasis purpurea var. purpurea (Walter) Chapman — purple sandgrass — 23 images — in Poaceae

Triticum aestivum L. — bread wheat — 3 images — in Poaceae

Tropaeolum majus L. — garden nasturtium — 4 images — in Tropaeolaceae

Tsuga canadensis (L.) Carr. — eastern hemlock — 58 images — in Pinaceae

Tulipa gesneriana L. — garden tulip, Didier's tulip, Gesner's tulip — 19 images — in Liliaceae

Tulipa sylvestris L. — wild European tulip — 6 images — in Liliaceae

Turritis glabra L. — tower mustard — 32 images — in Brassicaceae

Tussilago farfara L. — coltsfoot — 51 images — in Asteraceae

Typha angustifolia L. — narrow-leaved cattail — 16 images — in Typhaceae

Typha latifolia L. — broad-leaved cattail — 30 images — in Typhaceae

Typha ×glauca Godron — hybrid cattail — 11 images — in Typhaceae

Ulmus americana L. — American elm, white elm — 35 images — in Ulmaceae

Ulmus glabra Hudson — Scotch elm, Scots elm, wych elm — 3 images — in Ulmaceae

Ulmus glabra f. cornuta (I.David) Rehder — horned Scots elm, horned wych elm — 4 images — in Ulmaceae

Ulmus parvifolia Jacq. — Chinese elm — 19 images — in Ulmaceae

Ulmus procera Salisb. — English elm — 2 images — in Ulmaceae

Ulmus pumila L. — Siberian elm, dwarf elm — 21 images — in Ulmaceae

Ulmus rubra Muhl. — slippery elm — 11 images — in Ulmaceae

Urtica dioica L. — European stinging nettle — 26 images — in Urticaceae

Urtica gracilis Aiton — slender stinging nettle — 26 images — in Urticaceae

Urtica urens L. — burning nettle — 9 images — in Urticaceae

Utricularia cornuta Michx. — horned bladderwort, naked bladderwort — 41 images — in Lentibulariaceae

Utricularia geminiscapa Benj. — twin-scaped bladderwort — 24 images — in Lentibulariaceae

Utricularia gibba L. — humped bladderwort, creeping bladderwort — 19 images — in Lentibulariaceae

Utricularia inflata Walter — large floating bladderwort, swollen bladderwort, inflated bladderwort — 33 images — in Lentibulariaceae

Utricularia intermedia Hayne — northern bladderwort, flat-leaved bladderwort — 31 images — in Lentibulariaceae

Utricularia macrorhiza Le Conte — great bladderwort, common bladderwort — 26 images — in Lentibulariaceae

Utricularia purpurea Walter — eastern purple bladderwort — 36 images — in Lentibulariaceae

Utricularia radiata Small — small floating bladderwort — 27 images — in Lentibulariaceae

Utricularia resupinata B.D.Greene ex Bigelow — lavender bladderwort, northeastern bladderwort, resupinate bladderwort — 23 images — in Lentibulariaceae

Utricularia subulata L. — slender bladderwort, subulate bladderwort, zigzag bladderwort — 7 images — in Lentibulariaceae

Uvularia grandiflora G.E.Smith — large-flowered merrybells, large-flowered bellwort — 10 images — in Colchicaceae

Uvularia sessilifolia L. — little merrybells, sessile-leaved merrybells, sessile-leaved bellwort — 47 images — in Colchicaceae

Vaccaria hispanica (P.Miller) Rauschert — cow herb, cowcockle — 8 images — in Caryophyllaceae

Vaccinium angustifolium Ait. — lowbush blueberry — 43 images — in Ericaceae

Vaccinium caesariense Mackenzie — New Jersey highbush blueberry — 21 images — in Ericaceae

Vaccinium corymbosum L. — highbush blueberry — 73 images — in Ericaceae

Vaccinium fuscatum Ait. — black highbush blueberry — 35 images — in Ericaceae

Vaccinium macrocarpon Ait. — American cranberry, large cranberry — 59 images — in Ericaceae

Vaccinium myrtilloides Michx. — velvet-leaved blueberry, sourtop blueberry — 21 images — in Ericaceae

Vaccinium oxycoccos L. — small cranberry — 5 images — in Ericaceae

Vaccinium pallidum Ait. — hillside blueberry, dryland blueberry, early sweet blueberry — 57 images — in Ericaceae

Vaccinium stamineum L. — deerberry — 6 images — in Ericaceae

Vaccinium ×atlanticum Bicknell pro sp. — hybrid blueberry — 13 images — in Ericaceae

Valeriana officinalis L. — common valerian, garden heliotrope, all-heal — 10 images — in Caprifoliaceae

Vallisneria americana Michx. — tapegrass, water celery — 21 images — in Hydrocharitaceae

Veratrum californicum var. californicum Durand — Californian false hellebore — 1 images — in Melanthiaceae

Veratrum viride ssp. viride Aiton — eastern false hellebore — 29 images — in Melanthiaceae

Verbascum blattaria L. — moth mullein — 25 images — in Scrophulariaceae

Verbascum densiflorum Bertol. — dense-flowered mullein — 21 images — in Scrophulariaceae

Verbascum lychnitis L. — white mullein — 9 images — in Scrophulariaceae

Verbascum phlomoides L. — orange mullein — 9 images — in Scrophulariaceae

Verbascum thapsus L. — common mullein — 31 images — in Scrophulariaceae

Verbena bonariensis var. conglomerata Briq. — South American vervain, purpletop vervain — 17 images — in Verbenaceae

Verbena bracteata Lag. & Rodr. — prostrate vervain — 12 images — in Verbenaceae

Verbena hastata var. hastata L. — blue vervain, common vervain — 21 images — in Verbenaceae

Verbena stricta Vent. — hoary vervain — 9 images — in Verbenaceae

Verbena urticifolia var. urticifolia L. — white vervain — 18 images — in Verbenaceae

Verbesina alternifolia (L.) Britton — wingstem crownbeard — 10 images — in Asteraceae

Vernonia fasciculata Michx. — prairie ironweed — 25 images — in Asteraceae

Vernonia gigantea (Walter) Trel. — giant ironweed, tall ironweed — 7 images — in Asteraceae

Vernonia noveboracensis (L.) Michx. — New York ironweed — 29 images — in Asteraceae

Veronica arvensis L. — corn speedwell, field speedwell — 18 images — in Plantaginaceae

Veronica chamaedrys L. — birdseye speedwell, germander speedwell — 4 images — in Plantaginaceae

Veronica officinalis L. — common speedwell — 18 images — in Plantaginaceae

Veronica peregrina ssp. peregrina L. — purslane speedwell — 7 images — in Plantaginaceae

Veronica peregrina ssp. xalapensis (Kunth) Pennell — Xalapa purslane speedwell, Jalapa purslane speedwell — 5 images — in Plantaginaceae

Veronica persica Poiret — Persian speedwell, birdseye speedwell — 17 images — in Plantaginaceae

Veronica scutellata L. — marsh speedwell, narrow-leaved speedwell — 14 images — in Plantaginaceae

Veronica serpyllifolia ssp. serpyllifolia L. — thymeleaf speedwell — 29 images — in Plantaginaceae

Viburnum acerifolium L. — mapleleaf viburnum — 26 images — in Adoxaceae

Viburnum dentatum var. lucidum Ait. — northern arrowwood — 32 images — in Adoxaceae

Viburnum dentatum var. venosum (Britt.) Gleason — southern arrowwood — 1 images — in Adoxaceae

Viburnum dilatatum Thunb. — linden viburnum, linden arrowwood — 21 images — in Adoxaceae

Viburnum lantana L. — twistwood, wayfaring tree — 7 images — in Adoxaceae

Viburnum lantanoides Michx. — hobblebush, witch-hobble — 28 images — in Adoxaceae

Viburnum lentago L. — nannyberry, sweet viburnum — 43 images — in Adoxaceae

Viburnum nudum var. cassinoides (L.) Torrey & A.Gray — wild raisin viburnum, witherod — 65 images — in Adoxaceae

Viburnum nudum var. nudum L. — smooth witherod — 2 images — in Adoxaceae

Viburnum opulus ssp. opulus L. — European highbush cranberry, guelder rose — 30 images — in Adoxaceae

Viburnum opulus ssp. trilobum (Marsh.) Clausen — American highbush cranberry — 10 images — in Adoxaceae

Viburnum plicatum Thunb. — Japanese snowball viburnum — 12 images — in Adoxaceae

Viburnum rafinesqueanum var. rafinesqueanum J.A.Schultes — downy arrowwood, Rafinesque's arrowwood — 4 images — in Adoxaceae

Viburnum rhytidophyllum Hemsl. — leatherleaf viburnum — 2 images — in Adoxaceae

Viburnum sargentii Koehne — Sargent's viburnum, Tianmu viburnum — 5 images — in Adoxaceae

Viburnum setigerum Hance — tea viburnum — 3 images — in Adoxaceae

Viburnum sieboldii Miq. — Siebold's viburnum — 14 images — in Adoxaceae

Viburnum ×rhytidophylloides Sur. — hybrid viburnum (twistwood × leatherleaf) — 7 images — in Adoxaceae

Vicia cracca ssp. cracca L. — bird vetch — 13 images — in Fabaceae

Vicia hirsuta (L.) S.F.Gray — tiny vetch, hairy vetch — 3 images — in Fabaceae

Vicia sativa ssp. nigra (L.) Ehrh. — narrow-leaved vetch — 7 images — in Fabaceae

Vicia sativa ssp. sativa L. — spring vetch, tare — 11 images — in Fabaceae

Vicia tetrasperma (L.) Schreber — four-seed vetch — 13 images — in Fabaceae

Vicia villosa Roth — hairy vetch — 4 images — in Fabaceae

Vinca major L. — greater periwinkle — 13 images — in Apocynaceae

Vinca minor L. — common periwinkle — 34 images — in Apocynaceae

Vincetoxicum hirundinaria Medik. — white swallowwort — 5 images — in Apocynaceae

Vincetoxicum nigrum (L.) Moench — black swallowwort — 22 images — in Apocynaceae

Vincetoxicum rossicum (Kleopow) Barbarich — pale swallowwort — 14 images — in Apocynaceae

Viola adunca var. adunca J.E.Sm. — hook-spurred violet, sand violet — 15 images — in Violaceae

Viola affinis Leconte — Leconte's violet — 26 images — in Violaceae

Viola arvensis Murray — European field violet, field pansy — 7 images — in Violaceae

Viola blanda var. blanda Willd. — sweet white violet, large-leaved white violet — 18 images — in Violaceae

Viola blanda var. palustriformis A.Gray — Forbes' sweet white violet — 7 images — in Violaceae

Viola brittoniana Pollard — northern coastal violet, Britton's violet — 9 images — in Violaceae

Viola brittoniana × V. pectinata — Britton's violet × comb violet — 5 images — in Violaceae

Viola canadensis var. canadensis L. — tall white violet, Canada violet — 24 images — in Violaceae

Viola cucullata Aiton — marsh blue violet — 19 images — in Violaceae

Viola labradorica Schrank — American dog violet — 33 images — in Violaceae

Viola lanceolata ssp. lanceolata L. — bog white violet, lanceleaf violet — 40 images — in Violaceae

Viola odorata L. — English violet — 32 images — in Violaceae

Viola pallens (Banks ex DC.) Brainerd — smooth white violet, northern white violet, small white violet — 8 images — in Violaceae

Viola palmata L. — palmate-leaved violet, three-lobed violet, wood violet — 12 images — in Violaceae

Viola pectinata Bicknell — comb violet — 21 images — in Violaceae

Viola pedata L. — birdsfoot violet — 34 images — in Violaceae

Viola primulifolia L. — primrose-leaf violet — 15 images — in Violaceae

Viola pubescens var. pubescens Aiton — downy yellow violet — 13 images — in Violaceae

Viola pubescens var. scabriuscula Schwein. ex Torr. & A.Gray — smooth yellow violet — 23 images — in Violaceae

Viola renifolia A.Gray — kidney-leaf violet — 12 images — in Violaceae

Viola rostrata Pursh — long-spurred violet — 14 images — in Violaceae

Viola rotundifolia Michx. — round-leaved violet — 13 images — in Violaceae

Viola sagittata var. ovata (Nutt.) Torrey & A.Gray — ovate-leaf violet — 58 images — in Violaceae

Viola sagittata var. sagittata Aiton — arrowleaf violet, arrowhead violet — 2 images — in Violaceae

Viola selkirkii Pursh ex Goldie — great spurred violet — 9 images — in Violaceae

Viola sororia Willd. — common blue violet, woolly blue violet — 40 images — in Violaceae

Viola tricolor L. — garden violet, wild pansy, Johnny-jump-up — 10 images — in Violaceae

Viola ×bissellii House — Bissell's violet (marsh blue × common blue) — 16 images — in Violaceae

Vitis aestivalis var. aestivalis Michx. — summer grape, pigeon grape — 7 images — in Vitaceae

Vitis aestivalis var. bicolor Deam — silver-leaved summer grape — 22 images — in Vitaceae

Vitis labrusca L. — fox grape — 50 images — in Vitaceae

Vitis riparia Michx. — riverbank grape, frost grape — 6 images — in Vitaceae

Vitis vinifera L. — European grape, wine grape — 10 images — in Vitaceae

Vitis ×novae-angliae Fern. — New England hybrid grape (fox × riverbank) — 4 images — in Vitaceae

Vulpia myuros (L.) K.C.Gmelin — rattail annual fescue, mousetail annual fescue — 11 images — in Poaceae

Vulpia octoflora var. tenella (Willd.) Fern. — six-weeks annual fescue — 16 images — in Poaceae

Waldsteinia ternata Fritsch — trifoliolate barren strawberry — 9 images — in Rosaceae

Wisteria floribunda (Willd.) DC. — Japanese wisteria — 11 images — in Fabaceae

Wisteria sinensis (Sims) DC. — Chinese wisteria — 32 images — in Fabaceae

Wolffia brasiliensis Weddell — Brazilian watermeal, papillate watermeal — 5 images — in Araceae

Wolffia columbiana Karsten — globose watermeal — 6 images — in Araceae

Woodsia obtusa ssp. obtusa (Spreng.) Torr. — blunt-lobed cliff fern, blunt-lobed woodsia — 11 images — in Woodsiaceae

Woodwardia areolata (L.) T.Moore — netted chain fern — 42 images — in Blechnaceae

Woodwardia virginica (L.) Smith — Virginia chain fern — 37 images — in Blechnaceae

Xanthium strumarium var. canadense (P.Miller) Torrey & A.Gray — Canada cocklebur, Canada clotbur — 12 images — in Asteraceae

Xanthium strumarium var. strumarium L. — European cocklebur, European clotbur — 8 images — in Asteraceae

Xanthorhiza simplicissima Marsh. — shrubby yellowroot — 14 images — in Ranunculaceae

Xyris difformis var. difformis Chapman — bog yellow-eyed grass — 26 images — in Xyridaceae

Xyris montana Ries — northern yellow-eyed grass — 8 images — in Xyridaceae

Xyris smalliana Nash — quagmire yellow-eyed grass, Small's yellow-eyed grass — 7 images — in Xyridaceae

Xyris torta Small — twisted yellow-eyed grass — 30 images — in Xyridaceae

Yucca filamentosa L. — Spanish bayonet, Adam's needle — 23 images — in Agavaceae

Zanthoxylum americanum P.Miller — northern prickly ash, common prickly ash — 32 images — in Rutaceae

Zea mays ssp. mays L. — corn — 4 images — in Poaceae

Zelkova serrata (Thunb.) Makino — Japanese zelkova — 18 images — in Ulmaceae

Zizania aquatica var. aquatica L. — southern wild rice — 28 images — in Poaceae

Zizia aurea (L.) W.D.J.Koch — golden alexanders — 14 images — in Apiaceae

Zostera marina L. — common eelgrass — 9 images — in Zosteraceae

×Sorbaronia fallax C.K.Schneid. — black-fruited false mountain ash — 3 images — in Rosaceae

Generated March 24, 2024, 8:56 p.m.