Index of Latin Names (Vascular Plants with Photographs)

Abeliophyllum distichum Nakai — white forsythia — 7 images — in Oleaceae
Abies balsamea (L.) P.Miller — balsam fir — 28 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 negundo L. var. negundo — boxelder — 17 images — in Sapindaceae
Acer negundo var. violaceum (Kirsch.) Jaeg. — purple boxelder — 23 images — in Sapindaceae
Acer palmatum Thunb. — Japanese maple — 8 images — in Sapindaceae
Acer pensylvanicum L. — striped maple — 34 images — in Sapindaceae
Acer platanoides L. — Norway maple — 36 images — in Sapindaceae
Acer pseudoplatanus L. — sycamore maple — 20 images — in Sapindaceae
Acer rubrum L. — red maple — 117 images — in Sapindaceae
Acer saccharinum L. — silver maple — 42 images — in Sapindaceae
Acer 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
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 — 24 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 — 13 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 acuta Pennell — sandplain false foxglove, sandplain gerardia — 8 images — in Orobanchaceae
Agalinis maritima (Raf.) Raf. ssp. maritima — saltmarsh false foxglove, seaside gerardia — 18 images — in Orobanchaceae
Agalinis paupercula (A.Gray) Britton var. paupercula — 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 (Vahl) Raf. var. tenuifolia — slender false foxglove, slender gerardia — 6 images — in Orobanchaceae
Ageratina altissima (L.) King & H.E.Robinson var. altissima — 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 Michaux — 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 L. var. caryophyllea — 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
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
Alliaria petiolata (Bieb.) Cavara & Grande — garlic mustard — 23 images — in Brassicaceae
Allium canadense L. var. canadense — wild garlic, meadow garlic — 10 images — in Alliaceae
Allium carinatum L. — keeled garlic, witch's garlic — 8 images — in Alliaceae
Allium oleraceum L. — European wild garlic — 7 images — in Alliaceae
Allium sativum L. var. sativum — cultivated garlic — 4 images — in Alliaceae
Allium schoenoprasum L. — wild chives — 5 images — in Alliaceae
Allium tricoccum Aiton var. tricoccum — wild leek — 10 images — in Alliaceae
Allium tuberosum Rottler ex Spreng. non Roxb. — garlic chives, Chinese chives, Chinese leek — 7 images — in Alliaceae
Allium vineale L. — field garlic, crow garlic — 10 images — in Alliaceae
Alnus glutinosa (L.) Gaertner — European black alder — 27 images — in Betulaceae
Alnus rugosa (Du Roi) Spreng. — speckled alder — 47 images — in Betulaceae
Alnus serrulata (Ait.) Willd. — smooth alder, common alder — 51 images — in Betulaceae
Alopecurus pratensis L. — meadow foxtail — 9 images — in Poaceae
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. — 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
Amelanchier arborea (Michx.f.) Fern. — downy shadbush, downy serviceberry — 18 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 — 58 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 — 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 — 32 images — in Poaceae
Amorpha fruticosa L. — false indigo bush, false indigo — 21 images — in Fabaceae
Ampelopsis heterophylla var. brevipedunculata C.L.Li — 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
Anagallis arvensis L. — scarlet pimpernel — 17 images — in Myrsinaceae
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 (Walter) B.S.P. var. glomeratus — bushy bluestem, bunched broomsedge — 31 images — in Poaceae
Andropogon virginicus L. var. virginicus — broomsedge bluestem, Virginia broomsedge — 7 images — in Poaceae
Anemone blanda Schott & Kotschy — Greek windflower — 9 images — in Ranunculaceae
Anemone canadensis L. — Canada windflower — 2 images — in Ranunculaceae
Anemone nemorosa L. — European windflower — 5 images — in Ranunculaceae
Anemone quinquefolia L. var. quinquefolia — wood windflower — 40 images — in Ranunculaceae
Anemone ranunculoides L. — yellow wood windflower, European buttercup anemone — 15 images — in Ranunculaceae
Anemone virginiana L. var. virginiana — stout tall windflower, stout thimbleweed — 12 images — in Ranunculaceae
Angelica atropurpurea L. — purplestem angelica, great angelica, American angelica, alexanders — 4 images — in Apiaceae
Angelica lucida L. — seaside angelica — 27 images — in Apiaceae
Anisocampium niponicum (Beddome) Yea C.Liu, W.L.Chiou & M.Kato 'Metallicum' — Japanese painted fern — 7 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 Fern. ssp. parlinii — smooth pussytoes, Parlin's pussytoes — 10 images — in Asteraceae
Antennaria parlinii ssp. fallax (Greene) Bayer & Stebbins — broad-leaved pussytoes — 4 images — in Asteraceae
Antennaria plantaginifolia (L.) Richardson — plantain-leaved pussytoes — 19 images — in Asteraceae
Anthemis arvensis L. — dog chamomile, corn chamomile — 9 images — in Asteraceae
Anthoxanthum nitens (Weber) Y.Schouten & Veldkamp ssp. nitens — 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 — 12 images — in Apiaceae
Aphanes australis Rydberg — slender parsleypiert — 16 images — in Rosaceae
Apios americana Medik. — American groundnut — 40 images — in Fabaceae
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 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 — 28 images — in Araliaceae
Aralia hispida Vent. — bristly sarsaparilla — 36 images — in Araliaceae
Aralia nudicaulis L. — wild sarsaparilla — 46 images — in Araliaceae
Aralia racemosa L. ssp. racemosa — American spikenard — 18 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 — 40 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 Michx. var. dichotoma — 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
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 (L.) J.Presl & K.Presl ssp. elatius — 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 stelleriana Bess. — dustymiller, beach wormwood — 16 images — in Asteraceae
Artemisia tridentata Nutt. — sagebrush — 8 images — in Asteraceae
Artemisia vulgaris L. — mugwort, European common wormwood — 26 images — in Asteraceae
Aruncus dioicus (Walter) Fern. — goat's beard — 4 images — in Rosaceae
Asarum canadense L. — Canadian wild ginger — 19 images — in Aristolochiaceae
Asarum caudatum Lindl. — long-tailed wild ginger, western wild ginger — 6 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
Athyrium angustum (Willd.) C.Presl — northern ladyfern — 45 images — in Woodsiaceae
Athyrium asplenioides (Michx.) Desv. — southern ladyfern — 3 images — in Woodsiaceae
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 (L.) Farw. var. flava — smooth false foxglove — 14 images — in Orobanchaceae
Aureolaria pedicularia (L.) Raf. var. pedicularia — fernleaf false foxglove — 37 images — in Orobanchaceae
Aureolaria virginica (L.) Pennell — downy false foxglove — 27 images — in Orobanchaceae
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 (L.) R.Br. ex Ait.f. var. australis — blue false indigo — 10 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 — 7 images — in Brassicaceae
Barbarea vulgaris W.T.Aiton — common yellow rocket, common wintercress — 46 images — in Brassicaceae
Bartonia paniculata (Michx.) Muhl. ssp. paniculata — panicled screwstem — 6 images — in Gentianaceae
Bartonia virginica (L.) B.S.P. — yellow screwstem, Virginia screwstem — 24 images — in Gentianaceae
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 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 — 15 images — in Brassicaceae
Berteroa mutabilis (Vent.) DC. — roadside false alyssum, flatpod alyssum — 1 images — in Brassicaceae
Betula alleghaniensis Britton — yellow birch — 54 images — in Betulaceae
Betula cordifolia Regel — heartleaf paper birch, mountain paper birch — 6 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 — 46 images — in Betulaceae
Betula papyrifera × B. populifolia — paper birch × gray birch — 15 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 — 49 images — in Betulaceae
Betula pubescens Ehrh. ssp. pubescens — 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
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 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 dissectum Sprengel — cut-leaved grapefern, dissected grapefern — 11 images — in Ophioglossaceae
Botrychium matricariifolium (Döll) A.Braun ex W.D.J.Koch — daisyleaf moonwort — 5 images — in Ophioglossaceae
Botrychium oneidense (Gilbert) House — blunt-lobed grapefern — 21 images — in Ophioglossaceae
Botrychium virginianum (L.) Sw. — rattlesnake fern — 13 images — in Ophioglossaceae
Bouteloua curtipendula (Michx.) Torrey var. curtipendula — 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 Nymphaeaceae
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
Briza maxima L. — big quaking grass — 5 images — in Poaceae
Bromus arvensis L. — field chess, field brome — 3 images — in Poaceae
Bromus commutatus Schrad. — hairy chess, meadow brome — 3 images — in Poaceae
Bromus hordeaceus L. ssp. hordeaceus — soft brome, soft chess — 5 images — in Poaceae
Bromus inermis Leyss. ssp. inermis — 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
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 Nymphaeaceae
Cakile edentula (Bigelow) Hooker ssp. edentula var. edentula — American sea rocket — 22 images — in Brassicaceae
Calamagrostis canadensis (Michx.) Beauv. var. canadensis — 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 Pursh var. heterophylla — greater water starwort, two-headed water starwort, variable water starwort — 40 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 (L.) B.S.P. var. tuberosus — tuberous grasspink — 14 images — in Orchidaceae
Caltha palustris L. — marsh marigold — 16 images — in Ranunculaceae
Calycanthus floridus var. glaucus (Willd.) Torrey & A.Gray — sweetshrub — 6 images — in Calycanthaceae
Calystegia sepium (L.) R.Br. ssp. sepium — European false bindweed — 10 images — in Convolvulaceae
Calystegia sepium ssp. americana (Sims) Brummitt — American false bindweed — 11 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
Campsis radicans (L.) Seem. ex Bureau — trumpet creeper — 17 images — in Bignoniaceae
Cannabis sativa L. — marijuana, hemp — 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 — 19 images — in Brassicaceae
Cardamine flexuosa With. — greater bittercress, wavy bittercress — 44 images — in Brassicaceae
Cardamine hirsuta L. — hoary bittercress, hairy rockcress — 42 images — in Brassicaceae
Cardamine impatiens L. — narrowleaf bittercress, bushy rockcress — 16 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 parviflora var. arenicola (Britton) O.E.Schulz — sand small-flowered bittercress — 24 images — in Brassicaceae
Cardamine pensylvanica Muhl. ex Willd. — common bittercress, Pennsylvania bittercress — 6 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. ssp. bromoides — 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 Bailey var. communis — 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 Lam. var. crinita — 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 Schwein. var. deweyana — round-fruited short-scaled sedge — 7 images — in Cyperaceae
Carex digitalis Willd. var. digitalis — slender wood sedge, slender-spiked woodland sedge — 5 images — in Cyperaceae
Carex echinata Murray ssp. echinata — 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 Schwein. var. laxiculmis — 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 Wahlenb. ssp. leptalea — 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 Willd. ex Link ssp. lucorum — 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 (cf.) Krecz. — Mackenzie's sedge — 7 images — in Cyperaceae
Carex 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 Michaux — fewseeded sedge — 13 images — in Cyperaceae
Carex paleacea Schreber ex Wahlenb. — saltmarsh sedge, chaffy sedge — 7 images — in Cyperaceae
Carex pallescens L. — pale sedge — 18 images — in Cyperaceae
Carex panicea L. — millet sedge, grass-like sedge — 11 images — in Cyperaceae
Carex pedunculata Muhl. ex Willd. ssp. pedunculata — 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 Schkuhr ex Willd. var. scoparia — 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 Muhl. ex Willd. var. stipata — 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 (Fern.) Bickn. var. tonsa — stiff-leaved sand sedge, shaved sedge — 26 images — in Cyperaceae
Carex tonsa var. rugosperma (Mackenzie) W.J.Crins — hairy sand sedge, hairy shaved sedge — 6 images — in Cyperaceae
Carex torta Boott ex Tuckerman — twisted sedge, riverside sedge — 9 images — in Cyperaceae
Carex tribuloides Wahlenb. var. tribuloides — 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 — 5 images — in Fagaceae
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, 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
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 — 2 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 (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 — 40 images — in Caryophyllaceae
Cerastium glomeratum Thuill. — clammy chickweed, sticky chickweed — 9 images — in Caryophyllaceae
Cerastium pumilum W.Curtis ssp. pumilum — 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 L. var. canadensis — redbud — 15 images — in Fabaceae
Chaenomeles speciosa (Sweet) Nakai — Japanese flowering quince — 15 images — in Rosaceae
Chamaecrista fasciculata (Michx.) Greene — common partridge pea — 20 images — in Fabaceae
Chamaecrista nictitans (L.) Moench ssp. nictitans var. nictitans — 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
Chelidonium majus L. — greater celandine — 16 images — in Papaveraceae
Chelone glabra L. — white turtlehead — 26 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 L. ssp. glaucum — oakleaf goosefoot — 3 images — in Amaranthaceae
Chenopodium rubrum L. var. rubrum — 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 Hyacinthaceae
Chionodoxa luciliae Boiss. — Lucilia's glory-of-the-snow — 12 images — in Hyacinthaceae
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
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 L. var. maculata — 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 (L.) Hill ssp. canadensis — 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 Michx. var. horridulum — yellow thistle — 19 images — in Asteraceae
Cirsium pumilum (Nutt.) Sprengel var. pumilum — pasture thistle — 17 images — in Asteraceae
Cirsium vulgare (Savi) Ten. — common thistle, bull thistle — 38 images — in Asteraceae
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 — 22 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. — coastal sweet pepperbush — 45 images — in Clethraceae
Clinopodium vulgare L. — wild basil — 23 images — in Lamiaceae
Clintonia borealis (Aiton) Raf. — bluebead lily — 44 images — in Liliaceae
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 (L.) Nutt. ssp. umbellata — 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 — 12 images — in Orobanchaceae
Convallaria majalis L. — lily-of-the-valley — 34 images — in Ruscaceae
Convolvulus arvensis L. — field bindweed — 4 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
Corydalis solida (L.) Clairv. — purple 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 Marsh. ssp. cornuta — 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 crus-galli L. — cockspur hawthorn — 12 images — in Rosaceae
Crataegus fretalis Sarg. — Long Island Sound hawthorn — 7 images — in Rosaceae
Crataegus macracantha Lodd. ex Loud. var. macracantha — 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 pruinosa (Wendl.f.) K.Koch var. pruinosa — frosted hawthorn — 4 images — in Rosaceae
Crataegus sp. — hawthorn — 11 images — in Rosaceae
Crataegus submollis Sarg. — downy hawthorn, Quebec hawthorn — 9 images — in Rosaceae
Crataegus succulenta Schrader ex Link var. succulenta — 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 — 2 images — in Iridaceae
Crocus chrysanthus (Herb.) Herb. — snow crocus, golden crocus — 4 images — in Iridaceae
Crocus sieberii J.Gay — Sieber's crocus, Cretan crocus — 3 images — in Iridaceae
Crocus tommasinianus Herb. — woodland crocus, early or snow crocus — 11 images — in Iridaceae
Crocus vernus (L.) Hill ssp. vernus — spring crocus — 17 images — in Iridaceae
Crocus ×stellaris — starflowered crocus — 3 images — in Iridaceae
Crotalaria sagittalis L. — arrowhead rattlebox — 21 images — in Fabaceae
Cryptotaenia canadensis (L.) DC. — American honewort, Canada homewort — 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 Juss. ex Choisy var. compacta — dense dodder, compact dodder — 8 images — in Convolvulaceae
Cuscuta coryli Engelm. — pondshore dodder, hazel dodder — 21 images — in Convolvulaceae
Cuscuta gronovii Willd. ex Roem. & Schult. var. gronovii — common dodder, swamp dodder, strangleweed, love vine — 16 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
Cynanchum louiseae Kartesz & Gandhi — black swallowwort — 22 images — in Apocynaceae
Cynanchum rossicum (Kleopow) Borhidi — pale swallowwort — 14 images — in Apocynaceae
Cynanchum vincetoxicum (L.) Pers. — white swallowwort — 5 images — in Apocynaceae
Cynoglossum officinale L. — common European hound's tongue — 5 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. — bulblet bladder fern — 10 images — in Woodsiaceae
Cystopteris fragilis (L.) Bernh. — brittle bladder fern, fragile fern — 10 images — in Woodsiaceae
Cystopteris tenuis (Michx.) Desv. — upland brittle bladder fern, Mackay's fragile fern, Mackay's brittle fern — 5 images — in Woodsiaceae
Cytisus scoparius (L.) Link var. scoparius — Scotch broom — 20 images — in Fabaceae
Dactylis glomerata L. — orchard grass — 7 images — in Poaceae
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, white 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 — 23 images — in Lycopodiaceae
Dennstaedtia punctilobula (Michx.) T.Moore — hayscented fern — 59 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 — 3 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 — 14 images — in Papaveraceae
Dicentra cucullaria (L.) Bernh. — Dutchman's breeches — 6 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 (Andr.) Walp. — western bleeding heart, Pacific bleeding heart — 2 images — in Papaveraceae
Dichanthelium acuminatum (Sw.) Gould & C.A.Clark ssp. acuminatum — auburn panic grass, tapered panicgrass — 7 images — in Poaceae
Dichanthelium acuminatum ssp. columbianum (Scribn.) Freckmann & Lelong — downy panicgrass — 8 images — in Poaceae
Dichanthelium acuminatum ssp. fasciculatum (Torrey) Freckmann & Lelong — fascicled panicgrass — 19 images — in Poaceae
Dichanthelium acuminatum ssp. implicatum (Scribn.) Freckmann & Lelong — pondshore panicgrass — 8 images — in Poaceae
Dichanthelium acuminatum ssp. spretum (J.A.Schultes) Freckmann & Lelong — smooth panicgrass — 4 images — in Poaceae
Dichanthelium clandestinum (L.) Gould — deertongue panicgrass — 19 images — in Poaceae
Dichanthelium commutatum ssp. ashei (G.Pearson ex Ashe) Freckmann & Lelong — Ashe's variable panicgrass — 6 images — in Poaceae
Dichanthelium depauperatum (Muhl.) Gould — starved panicgrass, slender panicgrass — 3 images — in Poaceae
Dichanthelium dichotomum (L.) Gould ssp. dichotomum — forked panicgrass — 11 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 wrightianum (Scribner) 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 lanata Ehrh. — woolly foxglove, Grecian foxglove — 2 images — in Plantaginaceae
Digitalis lutea L. — straw foxglove, small yellow foxglove — 5 images — in Plantaginaceae
Digitalis purpurea L. var. purpurea — common foxglove, purple foxglove — 30 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 Walter var. teres — rough buttonweed — 18 images — in Rubiaceae
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
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 (P.Mill.) Nees var. umbellata — 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 Raf. var. filiformis — 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 — 6 images — in Rosaceae
Dryopteris carthusiana (Vill.) H.P.Fuchs — spinulose wood fern — 39 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 — 44 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
Duchesnea indica (Andr.) Focke — Indian strawberry — 16 images — in Rosaceae
Dulichium arundinaceum (L.) Britton — threeway sedge — 21 images — in Cyperaceae
Dysphania anthelmintica (L.) Mosyakin & Clemants — Mexican tea, wormseed — 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 (Beauv.) Fern. var. muricata — American barnyard grass, common cockspur — 3 images — in Poaceae
Echinochloa muricata var. microstachya Wieg. — small-spiked American barnyard grass, small-spiked cockspur — 6 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 — 4 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 Kunth var. elliptica — 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 (Willd.) J.A.Schultes var. obtusa — softstem spikerush, blunt spikesedge — 54 images — in Cyperaceae
Eleocharis obtusa var. ellipsoidalis Fern. — ellipsoid softstem spikerush — 10 images — in Cyperaceae
Eleocharis obtusa var. jejuna Fern. — slender softstem spikerush, starved softstem spikerush — 2 images — in Cyperaceae
Eleocharis palustris (L.) Roemer & Schultes — 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 (Willd.) Schultes var. tenuis — slender spikerush, slender spikesedge — 17 images — in Cyperaceae
Eleocharis tuberculosa (Michaux) 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 — 16 images — in Poaceae
Eleutherococcus pentaphyllus (Sieb. & Zucc.) Nakai — five-leaved aralia — 8 images — in Araliaceae
Elodea canadensis Michx. — northern waterweed, common waterweed — 11 images — in Hydrocharitaceae
Elodea nuttallii (Planchon) H.St.John — Nuttall's waterweed, free-flowered waterweed — 10 images — in Hydrocharitaceae
Elymus canadensis L. var. canadensis — Canada wild rye — 5 images — in Poaceae
Elymus hystrix L. — eastern bottlebrush grass — 16 images — in Poaceae
Elymus repens (L.) Gould — couchgrass, quackgrass, creeping wild rye — 6 images — in Poaceae
Elymus trachycaulus ssp. glaucus (Pease & Moore) Cody — slender wheatgrass — 3 images — in Poaceae
Elymus virginicus L. var. virginicus — Virginia wild rye, common eastern wild rye — 17 images — in Poaceae
Elymus virginicus var. halophilus (Bicknell) Wieg. — saltmarsh eastern wild rye — 18 images — in Poaceae
Epifagus virginiana (L.) W.P.C.Barton — beechdrops — 30 images — in Orobanchaceae
Epigaea repens L. — trailing arbutus, mayflower — 50 images — in Ericaceae
Epilobium ciliatum Raf. var. ciliatum — glandular willowherb, American willowherb — 33 images — in Onagraceae
Epilobium coloratum Biehler — eastern willowherb, purple-leaved willowherb, cinnamon willowherb — 3 images — in Onagraceae
Epilobium leptophyllum Raf. — narrow-leaved 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 — 32 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 scouring rush — 27 images — in Equisetaceae
Equisetum sylvaticum L. — woodland horsetail — 9 images — in Equisetaceae
Equisetum variegatum Schleicher ex Weber & Mohr ssp. variegatum — 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 (Michx.) Nees ex Steud. var. pectinacea — tufted lovegrass — 24 images — in Poaceae
Eragrostis pilosa (L.) Beauv. var. pilosa — 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 (L.) Raf. ex DC. var. hieracifolius — fireweed, pilewort — 31 images — in Asteraceae
Erica carnea L. — winter heath, spring heath — 4 images — in Ericaceae
Erica x 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 L. var. philadelphicus — Philadelphia fleabane — 4 images — in Asteraceae
Erigeron pulchellus Michaux var. pulchellus — robin's plantain fleabane — 11 images — in Asteraceae
Erigeron strigosus Muhl. ex Willd. var. strigosus — 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 (L.) L'Hér. ex Aiton ssp. cicutarium — redstem storksbill, redstem filaree, alfileria — 6 images — in Geraniaceae
Eryngium planum L. — broad-leaved eryngo, Plains eryngo — 7 images — in Apiaceae
Eryngium yuccifolium Michx. var. yuccifolium — button eryngo — 5 images — in Apiaceae
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 Ker Gawler ssp. americanum — American trout lily — 46 images — in Liliaceae
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 — 25 images — in Celastraceae
Euonymus fortunei (Turcz.) Hand.-Mazz. — winter creeper — 27 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 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 sessilifolium L. — upland boneset — 5 images — in Asteraceae
Euphorbia cyparissias L. — cypress spurge — 22 images — in Euphorbiaceae
Euphorbia esula L. — leafy spurge — 13 images — in Euphorbiaceae
Euphorbia lathyris L. — caper spurge, gopher spurge — 3 images — in Euphorbiaceae
Euphorbia maculata L. — spotted spurge, spotted sandmat, milk purslane — 21 images — in Euphorbiaceae
Euphorbia polygonifolia L. — seaside spurge, seaside sandmat — 17 images — in Euphorbiaceae
Eurybia divaricata (L.) G.L.Nesom — white wood aster — 15 images — in Asteraceae
Eurybia macrophylla (L.) Cass. — large-leaved aster — 22 images — in Asteraceae
Eurybia radula (Aiton) G.L.Nesom — rough aster — 13 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 — 30 images — in Asteraceae
Eutrochium maculatum (L.) E.E.Lamont var. maculatum — spotted Joe-Pye-weed — 9 images — in Asteraceae
Eutrochium purpureum (L.) E.E.Lamont var. purpureum — sweet Joe-Pye-weed — 13 images — in Asteraceae
Fagopyrum esculentum Moench — garden buckwheat — 12 images — in Polygonaceae
Fagus grandifolia Ehrh. — American beech — 75 images — in Fagaceae
Fagus sylvatica L. — European beech — 25 images — in Fagaceae
Fallopia cilinodis (Michaux) Holub — fringed bindweed — 1 images — in Polygonaceae
Fallopia convolvulus (L.) A.Löve — black bindweed, false buckwheat — 3 images — in Polygonaceae
Fallopia cristata (Engelm. & A.Gray) Holub — winged bindweed — 10 images — in Polygonaceae
Fallopia japonica (Houtt.) R.Decr. var. japonica — Japanese knotweed — 37 images — in Polygonaceae
Fallopia japonica var. compacta (Hook.f.) J.P.Bailey — dwarf Japanese knotweed — 5 images — in Polygonaceae
Fallopia sachalinensis (F.Schmidt) R.Decr. — giant knotweed, Sakhalin knotweed — 11 images — in Polygonaceae
Fallopia scandens (L.) Holub — climbing false buckwheat, bindweed — 26 images — in Polygonaceae
Fallopia ×bohemica (Chrtek & Chrtková) J.P.Bailey — Bohemian knotweed — 37 images — in Polygonaceae
Festuca filiformis Pourret — hair fescue, fine-leaved sheep fescue — 9 images — in Poaceae
Festuca ovina L. — sheep fescue — 1 images — in Poaceae
Festuca trachyphylla (Hack.) Krajina — hard fescue — 17 images — in Poaceae
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 — 7 images — in Oleaceae
Forsythia viridissima Lindl. — greenstem forsythia, Korean forsythia — 9 images — in Oleaceae
Fragaria vesca L. ssp. vesca — European strawberry — 3 images — in Rosaceae
Fragaria vesca ssp. americana (Porter) Staudt — woodland strawberry — 9 images — in Rosaceae
Fragaria virginiana Duchesne ssp. virginiana — thick-leaved wild strawberry — 24 images — in Rosaceae
Fragaria ×ananasa Duchesne — garden strawberry — 3 images — in Rosaceae
Frangula alnus P.Miller — glossy buckthorn — 34 images — in Rhamnaceae
Frangula alnus 'Asplenifolia' — narrow-leaved cultivar of glossy buckthorn — 4 images — in Rhamnaceae
Fraxinus americana L. — white ash — 69 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 L. ssp. officinalis — 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 L. ssp. nivalis — 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 Michaux var. circaezans — wild licorice, forest bedstraw — 20 images — in Rubiaceae
Galium divaricatum Pourret ex Lam. — Lamarck's bedstraw, Mediterranean bedstraw — 5 images — in Rubiaceae
Galium lanceolatum Torrey — wild licorice, lanceleaf bedstraw — 9 images — in Rubiaceae
Galium mollugo L. — whorled white bedstraw, field madder — 26 images — in Rubiaceae
Galium obtusum Bigelow ssp. obtusum — 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 Aiton — hairy bedstraw — 29 images — in Rubiaceae
Galium tinctorium (L.) Scop. var. tinctorium — stiff marsh bedstraw, stiff three-petaled bedstraw — 35 images — in Rubiaceae
Galium trifidum L. ssp. trifidum — tricleft bedstraw, northern three-lobed bedstraw — 7 images — in Rubiaceae
Galium triflorum Michaux — fragrant bedstraw, sweet-scented bedstraw — 16 images — in Rubiaceae
Galium verum L. ssp. verum — 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 Griseb. var. andrewsii — Andrews' bottle gentian — 26 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 — 14 images — in Geraniaceae
Geranium thunbergii Sieb. & Zucc. ex Lindl. & Paxton — Japanese cranesbill, dewdrop cranesbill, Thunberg's geranium — 13 images — in Geraniaceae
Geum canadense Jacq. var. canadense — white avens — 48 images — in Rosaceae
Geum fragarioides (Michx.) Smedmark — Appalachian barren strawberry — 4 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 — 19 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 S.Watson var. grandis — tall mannagrass — 2 images — in Poaceae
Glyceria obtusa (Muhl.) Trin. — Atlantic mannagrass, coastal mannagrass — 19 images — in Poaceae
Glyceria septentrionalis A.S.Hitchc. var. septentrionalis — 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 — 40 images — in Plantaginaceae
Gratiola aurea forma leucantha Bartlett — white-flowered golden hedgehyssop — 24 images — in Plantaginaceae
Gymnocarpium dryopteris (L.) Newman — northern oak fern — 5 images — in Woodsiaceae
Halesia carolina L. — Carolina silverbell — 8 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 — 22 images — in Araliaceae
Hedera hibernica (G.Kirchn.) Bean — Atlantic ivy — 19 images — in Araliaceae
Helenium flexuosum Raf. — winged sneezeweed, purple-headed sneezeweed — 24 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
Hemerocallis fulva (L.) L. — orange daylily — 30 images — in Hemerocallidaceae
Hemerocallis lilioasphodelus L. — yellow daylily — 1 images — in Hemerocallidaceae
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
Hesperis matronalis L. — dame's rocket, dame's violet, Damask violet — 24 images — in Brassicaceae
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 L. ssp. moscheutos — swamp mallow, swamp rose mallow — 27 images — in Malvaceae
Hibiscus syriacus L. — shrubby rose mallow, Korean hibiscus, rose-of-Sharon — 6 images — in Malvaceae
Hieracium aurantiacum L. — orange hawkweed — 10 images — in Asteraceae
Hieracium caespitosum Dumort. — king-devil, meadow hawkweed — 9 images — in Asteraceae
Hieracium flagellare Willd. — whip hawkweed — 6 images — in Asteraceae
Hieracium gronovii L. — Gronovius' hawkweed — 25 images — in Asteraceae
Hieracium kalmii L. — Canada hawkweed — 5 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 pilosella L. — mouse-ear hawkweed — 8 images — in Asteraceae
Hieracium piloselloides Vill. — smooth hawkweed — 21 images — in Asteraceae
Hieracium sabaudum L. — Savoy hawkweed — 31 images — in Asteraceae
Hieracium scabrum Michx. — rough hawkweed — 28 images — in Asteraceae
Hieracium venosum L. — rattlesnake hawkweed, rattlesnake weed — 13 images — in Asteraceae
Holcus lanatus L. — common velvetgrass — 26 images — in Poaceae
Holosteum umbellatum L. ssp. umbellatum — 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 Hostaceae
Hosta ventricosa (Salisb.) Stearn — blue plantain lily — 6 images — in Hostaceae
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 hop — 5 images — in Cannabaceae
Humulus lupulus L. ssp. lupulus — common European hop — 4 images — in Cannabaceae
Huperzia lucidula (Michaux) Trev. — shining firmoss, shining clubmoss — 13 images — in Huperziaceae
Hyacinthoides non-scripta (L.) Chouard — English bluebell — 5 images — in Asparagaceae
Hyacinthoides ×variabilis P.D.Sell — hybrid bluebell — 12 images — in Asparagaceae
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
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 — 11 images — in Boraginaceae
Hylodesmum glutinosum (Muhl. ex Willd.) H.Ohashi & R.R.Mill — cluster-leaved ticktrefoil, pointed-leaf ticktrefoil — 7 images — in Fabaceae
Hylodesmum nudiflorum (L.) H.Ohashi & R.R.Mill — naked ticktrefoil, naked-flower ticktrefoil — 7 images — in Fabaceae
Hylotelephium telephium (L.) H.Ohba ssp. telephium — live-forever — 15 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 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, spotted cat's ear — 44 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 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 Ait. var. opaca — 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 purpurea (L.) Roth — purple morning glory, common morning glory — 9 images — in Convolvulaceae
Iris cristata Aiton — crested dwarf iris — 1 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 sp. — 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
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 dichotomus Ell. — forked rush — 6 images — in Juncaceae
Juncus effusus L. ssp. effusus — common soft rush — 5 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 or creeping juniper — 11 images — in Cupressaceae
Juniperus virginiana ssp. crebra (Fern. & Griscom) A.E.Murray — eastern red cedar — 71 images — in Cupressaceae
Kalmia angustifolia L. var. angustifolia — 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 — 12 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 L. var. amplexicaule — 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 (L.) L. ssp. galeobdolon — yellow henbit, yellow archangel — 1 images — in Lamiaceae
Lamium maculatum L. — spotted henbit, spotted deadnettle — 7 images — in Lamiaceae
Lamium purpureum L. var. purpureum — 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 Leggett ex Britt. var. intermedia — largepod pinweed — 28 images — in Cistaceae
Lechea maritima Leggett ex B.S.P. var. maritima — 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 Schrader var. densiflorum — 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 L. var. virginicum — 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 (L.) Hornem. ssp. hirta — hairy bushclover — 13 images — in Fabaceae
Lespedeza procumbens Michaux — 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 (Lunell) Shinners var. novae-angliae — New England blazing star, northern blazing star — 36 images — in Asteraceae
Liatris spicata (L.) Willd. var. spicata — sessile-headed blazing star, marsh blazing star — 8 images — in Asteraceae
Ligusticum scothicum L. ssp. scothicum — sea lovage, Scotch lovage — 4 images — in Apiaceae
Ligustrum obtusifolium Sieb. & Zucc. var. obtusifolium — 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. — sea lavender — 43 images — in Plumbaginaceae
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 (L.) Pennell var. dubia — yellow-seeded riverside lindernia — 3 images — in Linderniaceae
Lindernia dubia var. anagallidea (Michx.) Cooperrider — yellow-seeded false pimpernel — 27 images — in Linderniaceae
Linnaea borealis ssp. americana (Forbes) Hultén ex 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 — 23 images — in Altingiaceae
Liriodendron tulipifera L. — tuliptree — 34 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 L. var. siphilitica — great blue lobelia — 15 images — in Campanulaceae
Lobelia spicata Lam. var. spicata — 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 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 — 53 images — in Caprifoliaceae
Lonicera periclymenum L. — woodbine, European common honeysuckle — 3 images — in Caprifoliaceae
Lonicera sempervirens L. var. sempervirens — trumpet honeysuckle — 11 images — in Caprifoliaceae
Lonicera tatarica L. — Tatarian honeysuckle — 3 images — in Caprifoliaceae
Lonicera ×bella Zabel — hybrid honeysuckle, whitebell honeysuckle — 35 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 — 12 images — in Brassicaceae
Lupinus perennis L. ssp. perennis — wild lupine, sundial lupine — 23 images — in Fabaceae
Lupinus polyphyllus Lindley var. polyphyllus — 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 (Retz.) Lej. ssp. multiflora — common woodrush — 37 images — in Juncaceae
Lychnis coronaria (L.) Murray — mullein lychnis, mullein pink — 11 images — in Caryophyllaceae
Lychnis flos-cuculi L. ssp. flos-cuculi — ragged robin lychnis, ragged robin — 9 images — in Caryophyllaceae
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. — running clubmoss, common 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 (L.) DC. var. ligustrina — 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 Myrsinaceae
Lysimachia ciliata L. — fringed loosestrife — 14 images — in Myrsinaceae
Lysimachia clethroides Duby ex DC. — gooseneck loosestrife — 4 images — in Myrsinaceae
Lysimachia hybrida Michaux — narrow-leaved loosestrife — 11 images — in Myrsinaceae
Lysimachia maritima (L.) Galasso, Banfi & Soldano — sea milkwort — 9 images — in Myrsinaceae
Lysimachia nummularia L. — creeping loosestrife, creeping Jenny, moneywort — 12 images — in Myrsinaceae
Lysimachia quadrifolia L. — whorled loosestrife — 19 images — in Myrsinaceae
Lysimachia terrestris (L.) B.S.P. — swamp loosestrife, swamp candles — 25 images — in Myrsinaceae
Lysimachia thyrsiflora L. — tufted loosestrife — 9 images — in Myrsinaceae
Lysimachia ×producta (A.Gray) Fern. — produced loosestrife — 6 images — in Myrsinaceae
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 L. ssp. virginiana — 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 — 2 images — in Ruscaceae
Maianthemum canadense Desf. — Canada mayflower — 18 images — in Ruscaceae
Maianthemum racemosum (L.) Link ssp. racemosum — 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 floribunda Sieb. ex Van Houtte — Japanese flowering crabapple — 20 images — in Rosaceae
Malus prunifolia (Willd.) Borkh. — plum-leaved crabapple — 7 images — in Rosaceae
Malus pumila P.Miller — orchard apple, common apple — 10 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 — 14 images — in Malvaceae
Marsilea quadrifolia L. — European water clover, 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 — 28 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 L. ssp. spicata — 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 virginica (L.) Pers. ex Link — Virginia bluebells, eastern bluebells, Virginia cowslip — 4 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 (Michaux) Small — early saxifrage — 25 images — in Saxifragaceae
Microstegium vimineum (Trin.) A.Camus — Japanese stiltgrass — 29 images — in Poaceae
Mikania scandens (L.) Willd. — climbing hempvine — 30 images — in Asteraceae
Mimulus ringens L. — long-stalked monkeyflower, square-stemmed monkeyflower, blue monkeyflower, Allegheny monkeyflower — 17 images — in Phrymaceae
Mirabilis nyctaginea (Michaux) MacMillan — heartleaf umbrellawort, heartleaf four-o'clock — 13 images — in Nyctaginaceae
Miscanthus sinensis Andersson — Chinese silvergrass, Chinese plumegrass — 39 images — in Poaceae
Mitchella repens L. — partridgeberry — 21 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. — wild bergamot, wild beebalm — 16 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
Muscari botryoides (L.) P.Miller — common grape hyacinth — 2 images — in Hyacinthaceae
Muscari neglectum Guss. ex Ten. — Atlantic grape hyacinth — 19 images — in Hyacinthaceae
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 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 altissima (L.) Hooker — tall rattlesnake root, slender rattlesnake root — 20 images — in Asteraceae
Nabalus serpentarius (Pursh) Hooker — lion's foot, 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
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 — 9 images — in Brassicaceae
Nelumbo lutea Willd. — American lotus, yellow lotus — 4 images — in Nelumbonaceae
Nepeta cataria L. — catnip — 2 images — in Lamiaceae
Nipponanthemum nipponicum (Franch. ex Maxim.) Kitam. — Nippon daisy — 9 images — in Asteraceae
Nuphar variegata Durand ex Clinton — yellow waterlily, spatterdock — 44 images — in Nymphaeaceae
Nuttallanthus canadensis (L.) D.A.Sutton — blue toadflax, old-field toadflax — 37 images — in Plantaginaceae
Nymphaea odorata Aiton ssp. odorata — American white waterlily, fragrant waterlily — 28 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 — 31 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 — 9 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 Raf. ssp. pilosella — meadow evening primrose, hairy sundrops — 2 images — in Onagraceae
Onoclea sensibilis L. — sensitive fern — 37 images — in Onocleaceae
Opuntia humifusa (Raf.) Raf. — eastern prickly pear, devil's tongue — 8 images — in Cactaceae
Origanum vulgare L. — oregano, sweet marjoram — 3 images — in Lamiaceae
Ornithogalum umbellatum L. — star-of-Bethlehem — 25 images — in Hyacinthaceae
Orobanche uniflora L. — 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 — 44 images — in Osmundaceae
Osmundastrum cinnamomeum (L.) C.Presl — cinnamon fern — 38 images — in Osmundaceae
Ostrya virginiana (P.Mill.) K.Koch — eastern hophornbeam — 42 images — in Betulaceae
Othocallis siberica (Haw. ex Andr.) Speta — Siberian squill — 11 images — in Hyacinthaceae
Oxalis corniculata L. — creeping woodsorrel — 10 images — in Oxalidaceae
Oxalis dillenii Jacq. — showy woodsorrel, southern woodsorrel — 32 images — in Oxalidaceae
Oxalis florida Salisb. — flowering woodsorrel, smooth woodsorrel — 6 images — in Oxalidaceae
Oxalis montana Raf. — mountain 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 — 12 images — in Buxaceae
Pachysandra terminalis Sieb. & Zucc. — Japanese spurge — 10 images — in Buxaceae
Packera aurea (L.) A.Löve & D.Löve — golden ragwort, golden groundsel — 22 images — in Asteraceae
Packera obovata (Muhl. ex Willd.) W.A.Weber & A.Löve — broad-leaved ragwort, running groundsel — 15 images — in Asteraceae
Packera paupercula (Michaux) 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 L. ssp. capillare — witchgrass, witch panicgrass — 16 images — in Poaceae
Panicum dichotomiflorum Michx. var. dichotomiflorum — fall panicgrass — 38 images — in Poaceae
Panicum philadelphicum Bernh. ex Trin. ssp. philadelphicum — Philadelphia panicgrass — 11 images — in Poaceae
Panicum rigidulum Bosc ex Nees ssp. rigidulum — flat-stemmed panicgrass — 17 images — in Poaceae
Panicum verrucosum Muhl. — warty panicgrass — 24 images — in Poaceae
Panicum virgatum L. — switch panicgrass, switchgrass — 41 images — in Poaceae
Parathelypteris noveboracensis (L.) Ching — New York fern — 23 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 (Raf.) Fern. var. fastigiata — hairy forked whitlow-wort, hairy forked chickweed — 8 images — in Caryophyllaceae
Parthenocissus quinquefolia (L.) Planchon — Virginia creeper — 55 images — in Vitaceae
Parthenocissus tricuspidata (Sieb. & Zucc.) Planchon — Japanese creeper, Japanese ivy, grape ivy, Boston ivy — 11 images — in Vitaceae
Parthenocissus vitacea (Knerr) A.S.Hitchc. — thicket creeper, grape woodbine — 16 images — in Vitaceae
Paspalum setaceum Michx. var. setaceum — small-fruited beadgrass, slender beadgrass — 7 images — in Poaceae
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
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
Pedicularis canadensis L. ssp. canadensis — 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 (L.) S. F. Gray — erect water smartweed — 2 images — in Polygonaceae
Persicaria arifolia (L.) Haroldson — 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 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 — 28 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 Greuter & Burdet — Himalayan knotweed, garden smartweed — 14 images — in Polygonaceae
Petasites hybridus (L.) Gaertner, B.Meyer & Scherb. — butterbur, butterbur sweet coltsfoot — 11 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 — 2 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
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 — 41 images — in Rutaceae
Phellodendron chinense C.K.Schneider — Chinese corktree — 2 images — in Rutaceae
Phellodendron sachalinense (Fr.Schmidt) Sarg. — Sakhalin corktree — 20 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. — fall phlox, garden phlox — 2 images — in Polemoniaceae
Phlox stolonifera Sims — creeping phlox — 2 images — in Polemoniaceae
Phlox subulata L. ssp. subulata — moss phlox — 5 images — in Polemoniaceae
Photinia villosa (Thunb.) DC. — Oriental photinia, Christmas berry — 3 images — in Rosaceae
Phragmites altissimus (Benth.) Mabille — 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 — 79 images — in Poaceae
Phyllostachys aureosulcata McClure — yellow-grooved bamboo — 9 images — in Poaceae
Phyllostachys dulcis McClure — sweetshoot bamboo — 5 images — in Poaceae
Physalis alkekengi L. — Chinese lantern plant — 6 images — in Solanaceae
Physalis grisea (Waterfall) M.Martinez — downy groundcherry, strawberry tomato — 5 images — in Solanaceae
Physalis heterophylla Nees var. heterophylla — 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 — 11 images — in Solanaceae
Physocarpus opulifolius (L.) Maxim. — ninebark — 3 images — in Rosaceae
Physostegia virginiana (L.) Bentham ssp. virginiana — false dragonhead — 4 images — in Lamiaceae
Phytolacca americana L. var. americana — American pokeweed, poke sallet — 21 images — in Phytolaccaceae
Picea abies (L.) H.Karst. — Norway spruce — 54 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 pruce — 12 images — in Pinaceae
Picea rubens Sarg. — red spruce — 19 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 (L.) A.Gray var. pumila — Canada clearweed — 17 images — in Urticaceae
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 — 12 images — in Pinaceae
Pinus resinosa Ait. — red pine — 23 images — in Pinaceae
Pinus rigida P.Miller — pitch pine — 132 images — in Pinaceae
Pinus strobus L. — white pine — 89 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 — 24 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 Michaux — bracted plantain — 18 images — in Plantaginaceae
Plantago intermedia DC. — saltmarsh 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 — 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 — 3 images — in Orchidaceae
Platanthera blephariglottis (Willd.) Lindl. var. blephariglottis — 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. — western plane, American planetree, sycamore — 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 — 16 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 L. ssp. trivialis — rough-sheathed bluegrass, rough bluegrass — 5 images — in Poaceae
Podophyllum peltatum L. — mayapple, wild mandrake — 14 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 L. var. reptans — 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 paucifolia Willd. — fringed milkwort, flowering wintergreen — 14 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
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 L. — dooryard knotweed, doorweed — 26 images — in Polygonaceae
Polygonum glaucum Nutt. — seaside knotweed — 10 images — in Polygonaceae
Polygonum ramosissimum ssp. prolificum (Small) Costea & Tardif — saltmarsh knotweed — 13 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 — 39 images — in Polypodiaceae
Polystichum acrostichoides (Michx.) Schott — Christmas fern — 36 images — in Dryopteridaceae
Pontederia cordata L. — pickerelweed — 41 images — in Pontederiaceae
Populus alba L. — white poplar — 16 images — in Salicaceae
Populus balsamifera L. ssp. balsamifera — balsam poplar — 5 images — in Salicaceae
Populus deltoides Bartr. ex Marsh. ssp. deltoides — eastern cottonwood, necklace poplar — 40 images — in Salicaceae
Populus grandidentata Michaux — 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 Michaux — American trembling aspen, quaking aspen — 45 images — in Salicaceae
Populus ×jackii Sarg. — Jack's poplar, balm-of-Gilead — 1 images — in Salicaceae
Portulaca oleracea L. — common purslane — 20 images — in Portulacaceae
Potamogeton amplifolius Tuckerman — bigleaf pondweed — 3 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 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 Michaux — 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 L. ssp. vulgaris — Eurasian heal-all, common selfheal — 3 images — in Lamiaceae
Prunella vulgaris ssp. lanceolata (W.Barton) Hultén — American heal-all, American selfheal — 7 images — in Lamiaceae
Prunus 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 depressa Pursh — sand cherry, sandbar cherry — 7 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 Marsh. var. maritima — beach plum — 62 images — in Rosaceae
Prunus nigra Aiton — Canada plum — 4 images — in Rosaceae
Prunus pensylvanica L.f. var. pensylvanica — pin cherry, fire cherry — 38 images — in Rosaceae
Prunus persica (L.) Batsch — peach — 28 images — in Rosaceae
Prunus serotina Ehrh. — black cherry — 82 images — in Rosaceae
Prunus serrulata Lindley — Japanese cherry — 13 images — in Rosaceae
Prunus susquehanae Willd. — Appalachian sand plum, Appalachian sand cherry — 34 images — in Rosaceae
Prunus virginiana L. var. virginiana — 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 (Mirbel) Franco ssp. menziesii — coastal Douglas fir, Coast Douglas fir — 25 images — in Pinaceae
Pseudotsuga menziesii ssp. glauca (Beissn.) A.E.Murray — Rocky Mountain Douglas fir — 15 images — in Pinaceae
Ptelea trifoliata L. ssp. trifoliata var. trifoliata — 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
Puschkinia scilloides Adams — striped squill — 14 images — in Hyacinthaceae
Pycnanthemum incanum (L.) Michx. var. incanum — hoary mountain mint — 5 images — in Lamiaceae
Pycnanthemum muticum (Michx.) Pers. — short-toothed mountain mint, clustered mountain mint — 31 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 Michx. ssp. asarifolia — 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 ilicifolia Wangenh. — scrub oak, bear oak — 94 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 ×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 — 29 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 ficaria L. — lesser celandine, pilewort, fig crowfoot — 24 images — in Ranunculaceae
Ranunculus flabellaris Raf. — yellow water buttercup, yellow water crowfoot — 4 images — in Ranunculaceae
Ranunculus micranthus Nutt. — small-flowered buttercup, small-flowered crowfoot — 8 images — in Ranunculaceae
Ranunculus recurvatus Poiret var. recurvatus — hooked buttercup, hooked crowfoot — 31 images — in Ranunculaceae
Ranunculus repens L. — creeping buttercup, creeping crowfoot — 28 images — in Ranunculaceae
Ranunculus sceleratus L. var. sceleratus — cursed buttercup, celery-leaved buttercup, cursed crowfoot, celery-leaved crowfoot — 7 images — in Ranunculaceae
Raphanus raphanistrum L. — wild radish — 27 images — in Brassicaceae
Ratibida pinnata (Vent.) Barnh. — gray-headed prairie coneflower, gray-headed Mexican hat — 10 images — in Asteraceae
Rhamnus cathartica L. — European common buckthorn, purging buckthorn — 39 images — in Rhamnaceae
Rheum rhabarbarum L. — rhubarb — 4 images — in Polygonaceae
Rhexia virginica L. — Virginia meadowbeauty, northern meadowbeauty, wingstem meadowpitchers — 57 images — in Melastomataceae
Rhinanthus minor L. ssp. minor — little yellow rattle — 12 images — in Orobanchaceae
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 — Kaempfer's azalea, torch azalea — 3 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 — jetbead, white kerria — 25 images — in Rosaceae
Rhus aromatica Aiton — fragrant sumac — 10 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 hirta (L.) Sudworth — 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 cynosbati L. — eastern prickly gooseberry, wild gooseberry — 17 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 rubrum L. — garden red currant — 17 images — in Grossulariaceae
Ribes uva-crispa var. sativum DC. — European gooseberry — 3 images — in Grossulariaceae
Robinia hispida L. var. hispida — bristly locust — 20 images — in Fabaceae
Robinia pseudoacacia L. — black locust — 39 images — in Fabaceae
Robinia viscosa Vent. var. viscosa — 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 — 10 images — in Rosaceae
Rosa blanda Aiton var. blanda — smooth rose — 8 images — in Rosaceae
Rosa canina L. — dog rose — 16 images — in Rosaceae
Rosa carolina L. ssp. carolina — 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 Rehder & 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 Blanchard — 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 dalibarda L. — dewdrop, Dalibard's dewberry — 15 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 L. ssp. idaeus — European raspberry, garden raspberry — 4 images — in Rosaceae
Rubus idaeus ssp. strigosus (Michaux) Focke — wild red raspberry — 1 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 — 22 images — in Rosaceae
Rubus odoratus L. — flowering raspberry, thimbleberry — 14 images — in Rosaceae
Rubus parviflorus L. — western thimbleberry — 3 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 Blanchard — 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 L. var. laciniata — green-headed coneflower, tall coneflower — 5 images — in Asteraceae
Rudbeckia subtomentosa Pursh — sweet coneflower — 3 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 L. ssp. crispus — curly dock — 27 images — in Polygonaceae
Rumex obtusifolius L. ssp. obtusifolius — 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 (Ell.) Torrey & A.Gray ssp. decumbens — 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 Michx. var. graminea — 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. — musk willow, Persian willow — 15 images — in Salicaceae
Salix alba L. — white willow — 13 images — in Salicaceae
Salix atrocinerea Brotero — rusty willow — 115 images — in Salicaceae
Salix atrocinerea × S. bebbiana — rusty willow × Bebb's willow — 24 images — in Salicaceae
Salix atrocinerea × S. discolor — rusty willow × American pussy willow — 8 images — in Salicaceae
Salix atrocinerea × S. humilis — rusty willow x upland willow — 13 images — in Salicaceae
Salix atrocinerea × S. occidentalis — rusty willow × dwarf upland willow — 5 images — in Salicaceae
Salix atrocinerea/cinerea complex — rusty and ash willow with hybrids — 26 images — in Salicaceae
Salix aurita L. — eared willow — 3 images — in Salicaceae
Salix bebbiana Sarg. — Bebb's willow — 36 images — in Salicaceae
Salix candida Fluegge ex Willd. — hoary willow, long-beaked willow — 19 images — in Salicaceae
Salix cinerea L. — ash willow — 36 images — in Salicaceae
Salix discolor Muhl. — large pussy willow — 76 images — in Salicaceae
Salix elaeagnos Scop. — olive willow, rosemary willow — 3 images — in Salicaceae
Salix eriocephala Michaux ssp. eriocephala var. eriocephala — heartleaf willow, diamond willow — 59 images — in Salicaceae
Salix euxina Belyaeva — West Asian willow — 18 images — in Salicaceae
Salix exigua ssp. interior (Rowlee) Cronq. — sandbar willow — 17 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 Thunb. 'Albo-Marginata' — variegated entireleaf willow — 2 images — in Salicaceae
Salix lucida Muhl. ssp. lucida — shining willow — 22 images — in Salicaceae
Salix nigra Marsh. — black willow — 66 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 — 8 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 purpurea L. — basket willow — 17 images — in Salicaceae
Salix purpurea × S. viminalis — basket willow × common osier — 1 images — in Salicaceae
Salix sericea Marsh. — silky willow — 45 images — in Salicaceae
Salix serissima (Bailey) Fern. — autumn willow — 31 images — in Salicaceae
Salix viminalis L. — common osier — 2 images — in Salicaceae
Salix ×conifera Wangenh. (pro sp.) — cone-bearing willow (pussy willow × upland willow) — 9 images — in Salicaceae
Salix ×fragilis L. — brittle willow (white willow × West Asian willow) — 23 images — in Salicaceae
Salix ×jesupii Fern. — Jesup's willow (white willow × shining willow) — 18 images — in Salicaceae
Salix ×meyeriana Rostk. — Meyer's willow (bayleaf willow × West Asian willow) — 5 images — in Salicaceae
Salix ×sepulcralis Simonkai — golden weeping willow (white willow × Babylon willow) — 18 images — in Salicaceae
Salix ×smithiana Willd. — Smith's willow (ash willow × basket willow) — 9 images — in Salicaceae
Salsola kali L. ssp. kali — prickly saltwort, seabeach saltwort — 30 images — in Amaranthaceae
Salsola tragus L. — prickly saltwort, prickly 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-berried 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. — Canadian burnet, American burnet — 5 images — in Rosaceae
Sanguisorba minor Scop. — garden burnet — 10 images — in Rosaceae
Sanicula canadensis L. var. canadensis — black snakeroot, Canada blacksnakeroot — 6 images — in Apiaceae
Sanicula marilandica L. — Maryland black snakeroot, Maryland sanicle — 21 images — in Apiaceae
Saponaria officinalis L. — common soapwort, soapweed, bouncing bet — 21 images — in Caryophyllaceae
Sarracenia purpurea L. — purple pitcherplant — 38 images — in Sarraceniaceae
Sassafras albidum (Nutt.) Nees — sassafras — 77 images — in Lauraceae
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 (Michx.) Nash var. scoparium — little bluestem — 25 images — in Poaceae
Schoenoplectus acutus (Muhl. ex Bigel.) A.Löve & D.Löve var. acutus — 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 (Vahl) Palla var. pungens — common threesquare, threesquare bulrush — 32 images — in Cyperaceae
Schoenoplectus smithii (A.Gray) Soják var. smithii — bristleless Smith's clubsedge, bristleless Smith's bulrush — 11 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 — 14 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 (L.) Moensch ssp. autumnalis — 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 — 14 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 sarmentosum Bunge — stringy stonecrop, running stonecrop — 6 images — in Crassulaceae
Selaginella apoda (L.) Spring — meadow spikemoss — 9 images — in Selaginellaceae
Selaginella rupestris (L.) Spring — rock spikemoss — 21 images — in Selaginellaceae
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 (Poir.) Roemer & J.A.Schultes ssp. pumila — 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 — 14 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 armeria L. — sweetwilliam catchfly — 26 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 (Moench) Garcke ssp. vulgaris — bladder campion — 8 images — in Caryophyllaceae
Silphium perfoliatum L. — cup plant — 16 images — in Asteraceae
Sisymbrium altissimum L. — tumbling hedge mustard — 9 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 L. var. carolinense — Carolina nightshade, Carolina horsenettle — 23 images — in Solanaceae
Solanum dulcamara L. var. dulcamara — 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 lycopersicon L. var. lycoperscon — garden tomato — 8 images — in Solanaceae
Solanum nigrum ssp. nigrum L. — black nightshade — 4 images — in Solanaceae
Solanum physalifolium var. nitidibaccatum (Bitter) Edmonds — viscid nightshade, groundcherry nightshade, hoe nightshade — 3 images — in Solanaceae
Solanum ptycanthum Dun. — eastern black nightshade — 18 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 L. ssp. altissima — tall goldenrod — 18 images — in Asteraceae
Solidago arguta Aiton var. arguta — 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 L. var. caesia — wreath goldenrod, bluestem goldenrod, axillary goldenrod — 19 images — in Asteraceae
Solidago canadensis L. var. canadensis — Canada goldenrod — 13 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 Ait. ssp. nemoralis — gray goldenrod — 21 images — in Asteraceae
Solidago odora Aiton ssp. odora — licorice goldenrod, sweet goldenrod — 38 images — in Asteraceae
Solidago patula Muhl. ex Willd. ssp. patula — rough-leaved goldenrod — 4 images — in Asteraceae
Solidago patula ssp. strictula (Torrey & A.Gray) Semple — roundleaf goldenrod — 6 images — in Asteraceae
Solidago puberula Nutt. var. puberula — downy goldenrod — 20 images — in Asteraceae
Solidago rugosa P.Miller ssp. rugosa — common rough-stemmed goldenrod, common wrinkle-leaved goldenrod — 29 images — in Asteraceae
Solidago rugosa ssp. aspera (Aiton) Cronq. — southern rough-stemmed goldenrod, barrens goldenrod — 8 images — in Asteraceae
Solidago sempervirens L. ssp. sempervirens — seaside goldenrod — 50 images — in Asteraceae
Solidago simplex Kunth ssp. simplex var. simplex — sticky goldenrod — 2 images — in Asteraceae
Solidago speciosa Nutt. var. speciosa — showy goldenrod — 2 images — in Asteraceae
Solidago uliginosa Nutt. — swamp goldenrod — 16 images — in Asteraceae
Solidago ulmifolia Muhl. ex Willd. var. ulmifolia — elmleaf goldenrod — 30 images — in Asteraceae
Sonchus arvensis L. ssp. arvensis — 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 — 7 images — in Rosaceae
Sorbus aucuparia L. — European mountain ash — 39 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 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 (Aiton) Muhl. var. patens — 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
Spinulum annotinum (L.) A.Haines — stiff 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
Spiranthes cernua (L.) L.C.Rich. — nodding ladies' tresses — 20 images — in Orchidaceae
Spiranthes lacera (Raf.) Raf. var. lacera — 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 (Torrey ex A.Gray) Wood var. vaginiflorus — 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. — bladdernut — 4 images — in Staphyleaceae
Stellaria graminea L. — grass-leaved stitchwort, field stitchwort, common stitchwort — 29 images — in Caryophyllaceae
Stellaria longifolia Muhl. ex Willd. var. longifolia — 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 — 21 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 (L.) Dumort. ssp. maritima — 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 — 27 images — in Cornaceae
Swida amomum (P.Miller) Small var. amomum — 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 orbiculatus Moench — coralberry, red snowberry — 6 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 (L.) G.L.Nesom var. ericoides — heath white aster, squarrose white aster — 11 images — in Asteraceae
Symphyotrichum laeve (L.) A.Löve & D.Löve var. laeve — smooth aster — 14 images — in Asteraceae
Symphyotrichum lanceolatum (Willd.) G.L.Nesom ssp. lanceolatum var. lanceolatum — 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 (L.) G.L.Nesom var. novi-belgii — New York aster — 49 images — in Asteraceae
Symphyotrichum patens (Aiton) G.L.Nesom var. patens — clasping aster, skydrops, skydrop aster — 20 images — in Asteraceae
Symphyotrichum pilosum (Willd.) G.L.Nesom var. pilosum — 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 (L.) A.Löve & D.Löve var. puniceum — 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 (Michaux) G.L.Nesom var. subulatum — annual saltmarsh aster, small-flowered saltmarsh aster — 15 images — in Asteraceae
Symphyotrichum tenuifolium (L.) G.L.Nesom var. tenuifolium — 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 — 43 images — in Araceae
Symplocos paniculata (Thunb.) Miq. — Asiatic sweetleaf, sapphireberry — 8 images — in Symplocaceae
Syringa reticulata (Blume) Hara ssp. reticulata — Amur tree lilac — 4 images — in Oleaceae
Syringa vulgaris L. — common lilac — 7 images — in Oleaceae
Tagetes erecta L. — Aztec marigold, big marigold — 1 images — in Asteraceae
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
Taxus baccata L. — English yew — 6 images — in Taxaceae
Taxus canadensis Marsh. var. canadensis — 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 L. var. canadense — American germander, saltmarsh germander — 22 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. — arborvitae, northern white cedar, eastern white cedar — 14 images — in Cupressaceae
Thymus pulegioides L. — European broad-leaved thyme, lemon thyme — 11 images — in Lamiaceae
Tiarella cordifolia L. var. cordifolia — foamflower — 26 images — in Saxifragaceae
Tilia americana L. var. americana — 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 (Torrey) Church var. pallida — pale mannagrass, Torrey's mannagrass — 11 images — in Poaceae
Torreyochloa pallida var. fernaldii (A.S.Hitchc.) Dore ex Koyama & Kawano — slender mannagrass, Fernald's mannagrass — 17 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 — 17 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 pratense L. — red clover — 11 images — in Fabaceae
Trifolium repens L. — white clover — 18 images — in Fabaceae
Triglochin maritima L. — saltmarsh arrowgrass — 25 images — in Juncaginaceae
Trillium cernuum L. var. cernuum — nodding trillium, nodding wakerobin — 18 images — in Melanthiaceae
Trillium cuneatum Raf. — little sweet Betsy — 4 images — in Melanthiaceae
Trillium erectum L. — red trillium, purple trillium, red wakerobin — 30 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 Bicknell var. aurantiacum — orange-fruited horse gentian, early horse gentian, wild coffee — 21 images — in Caprifoliaceae
Triplasis purpurea (Walter) Chapman var. purpurea — purple sandgrass — 23 images — in Poaceae
Tsuga canadensis (L.) Carr. — eastern hemlock — 53 images — in Pinaceae
Tulipa gesneriana L. — garden tulip, Didier's tulip, Gesner's tulip — 19 images — in Liliaceae
Tulipa sylvestris L. — wild European tulip — 3 images — in Liliaceae
Turritis glabra L. — tower mustard — 32 images — in Brassicaceae
Tussilago farfara L. — coltsfoot — 50 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 — 31 images — in Ulmaceae
Ulmus glabra Hudson — Scots elm, wych elm — 3 images — in Ulmaceae
Ulmus procera Salisb. — English elm — 2 images — in Ulmaceae
Ulmus pumila L. — Siberian elm, dwarf elm — 18 images — in Ulmaceae
Ulmus rubra Muhl. — slippery elm — 9 images — in Ulmaceae
Urtica dioica L. — stinging nettle — 26 images — in Urticaceae
Urtica gracilis Aiton — slender stinging nettle — 26 images — in Urticaceae
Utricularia cornuta Michx. — horned bladderwort, naked bladderwort — 38 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
Uvularia grandiflora G.E.Smith — large-flowered merrybells, large-flowered bellwort — 7 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 — 35 images — in Ericaceae
Vaccinium angustifolium var. nigrum (Wood) Dole — black-fruited lowbush blueberry — 8 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 — 18 images — in Hydrocharitaceae
Veratrum californicum Durand var. californicum — Californian false hellebore — 1 images — in Melanthiaceae
Veratrum viride Aiton ssp. viride — eastern false hellebore — 26 images — in Melanthiaceae
Verbascum blattaria L. — moth mullein — 18 images — in Scrophulariaceae
Verbascum densiflorum Bertol. — dense-flowered mullein — 5 images — in Scrophulariaceae
Verbascum lychnitis L. — white 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 L. var. hastata — blue vervain, common vervain — 21 images — in Verbenaceae
Verbena urticifolia L. var. urticifolia — white vervain — 18 images — in Verbenaceae
Verbesina alternifolia (L.) Britton — wingstem crownbeard — 10 images — in Asteraceae
Vernonia fasciculata Michx. — prairie ironweed — 18 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 filiformis L. — thread-stalked speedwell, creeping speedwell — 2 images — in Plantaginaceae
Veronica officinalis L. — common speedwell — 18 images — in Plantaginaceae
Veronica peregrina L. ssp. peregrina — 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 — 6 images — in Plantaginaceae
Veronica scutellata L. — marsh speedwell, narrow-leaved speedwell — 6 images — in Plantaginaceae
Veronica serpyllifolia L. ssp. serpyllifolia — thymeleaf speedwell — 29 images — in Plantaginaceae
Viburnum acerifolium L. — mapleleaf viburnum — 24 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 — 25 images — in Adoxaceae
Viburnum lentago L. — nannyberry, sweet viburnum — 41 images — in Adoxaceae
Viburnum nudum L. var. nudum — smooth witherod — 2 images — in Adoxaceae
Viburnum nudum var. cassinoides (L.) Torrey & A.Gray — wild raisin viburnum, witherod — 65 images — in Adoxaceae
Viburnum opulus L. ssp. opulus — European highbush cranberry, guelder rose — 30 images — in Adoxaceae
Viburnum opulus ssp. trilobum (Marsh.) Clausen — American highbush cranberry — 5 images — in Adoxaceae
Viburnum plicatum Thunb. — Japanese snowball viburnum — 12 images — in Adoxaceae
Viburnum rhytidophyllum Hemsl. — leatherleaf viburnum — 2 images — in Adoxaceae
Viburnum setigerum Hance — tea viburnum — 3 images — in Adoxaceae
Viburnum ×rhytidophylloides Sur. — hybrid viburnum (twistwood × leatherleaf) — 7 images — in Adoxaceae
Vicia cracca L. ssp. cracca — bird vetch — 13 images — in Fabaceae
Vicia hirsuta (L.) S.F.Gray — tiny vetch, hairy vetch — 3 images — in Fabaceae
Vicia sativa L. ssp. sativa — spring vetch, tare — 11 images — in Fabaceae
Vicia sativa ssp. nigra (L.) Ehrh. — narrow-leaved vetch — 7 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 — 9 images — in Apocynaceae
Vinca minor L. — common periwinkle — 32 images — in Apocynaceae
Viola adunca J.E.Sm. var. adunca — 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 Willd. var. blanda — 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 L. var. canadensis — 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 L. ssp. lanceolata — 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 — 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 Aiton var. pubescens — downy yellow violet — 8 images — in Violaceae
Viola pubescens var. scabriuscula Schwein. ex Torr. & A.Gray — smooth yellow violet — 17 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 — 7 images — in Violaceae
Viola sagittata Aiton var. sagittata — arrowleaf violet, arrowhead violet — 2 images — in Violaceae
Viola sagittata var. ovata (Nutt.) Torrey & A.Gray — ovate-leaf violet — 58 images — in Violaceae
Viola selkirkii Pursh ex Goldie — great spurred violet — 9 images — in Violaceae
Viola sororia Willd. — common blue violet — 40 images — in Violaceae
Viola tricolor L. — garden violet, wild pansy, Johnny-jump-up — 9 images — in Violaceae
Viola ×bissellii House — Bissell's violet (marsh blue × common blue) — 16 images — in Violaceae
Vitis aestivalis Michaux var. aestivalis — summer grape, pigeon grape — 7 images — in Vitaceae
Vitis aestivalis var. bicolor Deam — silver-leaved summer grape — 17 images — in Vitaceae
Vitis labrusca L. — fox grape — 48 images — in Vitaceae
Vitis riparia Michaux — riverbank grape, frost grape — 5 images — in Vitaceae
Vitis vinifera L. — European grape, wine grape — 12 images — in Vitaceae
Vitis ×novae-angliae Fern. — New England grape — 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
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 (Spreng.) Torr. ssp. obtusa — blunt-lobed woodsia, blunt-lobed cliff fern — 11 images — in Woodsiaceae
Woodwardia areolata (L.) T.Moore — netted chain fern — 39 images — in Blechnaceae
Woodwardia virginica (L.) Smith — Virginia chain fern — 36 images — in Blechnaceae
Xanthium strumarium L. var. strumarium — European cocklebur, European clotbur — 8 images — in Asteraceae
Xanthium strumarium var. canadense (P.Miller) Torrey & A.Gray — Canada cocklebur, Canada clotbur — 12 images — in Asteraceae
Xanthorhiza simplicissima Marsh. — shrubby yellowroot — 14 images — in Ranunculaceae
Xyris difformis Chapman var. difformis — 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 — 22 images — in Agavaceae
Zanthoxylum americanum P.Miller — northern prickly ash, common prickly ash — 13 images — in Rutaceae
Zea mays L. ssp. mays — corn — 4 images — in Poaceae
Zelkova serrata (Thunb.) Makino — Japanese zelkova — 15 images — in Ulmaceae
Zizania aquatica L. var. aquatica — southern wild rice — 28 images — in Poaceae
Zizia aurea (L.) W.D.J.Koch — golden alexanders — 14 images — in Apiaceae
×Sorbaronia fallax C.K.Schneid. — black-fruited false mountain ash — 3 images — in Rosaceae

Generated May 15, 2022, 2:16 p.m.