Chosenia

Chosenia arbutifolia (Pallas) A.Skv. = Salix arbutifolia Pallas chosenia Cultivated

Populus

Populus alba L. white poplar MIPAG: Not Invasive

Populus angustifolia James narrowleaf cottonwood Exotic

Populus balsamifera L. ssp. balsamifera balsam poplar Native — Watch-Listed

Populus deltoides Bartr. ex Marsh. ssp. deltoides eastern cottonwood, necklace poplar Native

Populus grandidentata Michx. bigtooth aspen Native

Populus heterophylla L. swamp cottonwood, swamp poplar Native — Endangered

Populus nigra L. Lombardy poplar, black poplar Introduced

Populus tremula L. European trembling aspen Waif

Populus tremuloides Michx. American trembling aspen, quaking aspen Native

Populus ×jackii Sarg. = Populus balsamifera × P. deltoides = Populus ×gileadensis Rouleau Jack's poplar, balm-of-Gilead Introduced

Salix

Salix aegyptiaca L. [and/or its hybrids] musk willow, Persian willow Waif

Salix alba L. = Salix alba ssp. caerulea (Sm.) Rech.f. = Salix alba ssp. vitellina (L.) Arcang. white willow Introduced

Salix atrocinerea Brotero = S. cinerea ssp. oleifolia (Smith) Macreight rusty willow Invasive

atrocinerea/cinerea complex rusty and ash willow with hybrids Invasive

Salix atrocinerea/cinerea × S. bebbiana rusty/ash willow × Bebb's willow Introduced

Salix atrocinerea/cinerea × S. discolor rusty or ash willow × American pussy willow Introduced

Salix atrocinerea/cinerea × S. humilis rusty/ash willow × upland willow N/A

Salix aurita L. eared willow Exotic

Salix bebbiana Sarg. Bebb's willow Native

Salix brachycarpa Nutt. barren-ground willow Exotic

Salix candida Fluegge ex Willd. hoary willow, long-beaked willow Native — Watch-Listed

Salix caprea L. goat willow Exotic

Salix cinerea L. = Salix cinerea L. ssp. cinerea gray willow, ash willow Invasive

Salix discolor Muhl. = Salix discolor var. latifolia Andersson American pussy willow Native

Salix drummondiana Barratt ex Hooker Drummond's willow Exotic

Salix eleagnos Scop. = Salix incana Schrank = Salix rosmarinifolia hort. non L. olive willow, rosemary willow No Current Records Photographs of CV 'Angustifolia' for years cultivated at Arnold Arb. as 'S. rosmarinifolia.' CNH Portal: BA 1854 Woods Hole (only record).

Salix eriocephala Michx. = Salix cordata Muhl. = Salix eriocephala Michx. ssp. eriocephala var. eriocephala = Salix rigida Muhl. heartleaf willow, diamond willow Native

Salix euxina Belyaeva = Salix fragilis auct. West Asian willow Cultivated

Salix exigua Nutt. ssp. exigua sandbar willow Exotic

Salix exigua ssp. interior (Rowlee) Cronq. = Salix interior Rowlee sandbar willow Native — Threatened (Photographs of shrubs planted to natural habitat outside native range during "restoration")

Salix glauca L. glaucous willow Exotic

Salix glauca var. callicarpaea grayleaf willow Exotic

Salix gracilistyla Miq. rose-gold pussy willow Cultivated

Salix humilis Marsh. prairie willow, upland willow Native

Salix integra f. albovariegata Kimura = Salix integra 'Hakuro Nishiki' variegated entireleaf willow, dappled willow Waif

Salix lasiandra var. caudata (Nutt.) Sudworth tail-leaf willow Exotic

Salix lucida Muhl. shining willow Native

Salix monticola Bebb mountain willow Exotic

Salix myrsinifolia Sm. dark-leaved willow, myrsine-leaved willow Exotic

Salix nigra Marsh. black willow Native

Salix nivalis Hooker snow willow Exotic

Salix occidentalis Walter = Salix humilis var. microphylla (Anderss.) Fern. = Salix humilis var. tristis (Ait.) Griggs = Salix tristis Ait. dwarf upland willow, dwarf prairie willow Native

Salix pedicellaris Pursh = Salix pedicellaris var. hypoglauca Fern. = Salix pedicellaris var. tenuescens Fern. bog willow Native — Watch-Listed

Salix pentandra L. bay willow Exotic

Salix pentandra × S. ×fragilis = Salix pentandra x (S. alba x S. euxina) hybrid willow Cultivated

Salix petiolaris J.E.Smith = Salix gracilis Andersson slender willow, meadow willow Native

Salix phylicifolia L. tea-leaved willow Exotic

Salix purpurea L. basket willow Introduced

Salix purpurea × S. viminalis = Salix × rubra Huds. green-leaved willow, red osier Waif A widespread natural hybrid native to a large part of Europe, known there under name 'S. ×rubra', praised by basketmakers, with a number of cultivars. Omitted in FNA.

Salix scouleriana Barratt ex Hooker Scouler's willow Exotic

Salix sericea Marsh. silky willow Native

Salix serissima (Bailey) Fern. autumn willow Native — Watch-Listed

Salix viminalis L. common osier Introduced

Salix ×conifera Wangenh. (pro sp.) = Salix discolor × S. humilis cone-bearing willow (pussy willow × upland willow) Native

Salix ×fragilis L. pro sp. = Salix alba × S. euxina = Salix ×rubens Schrank brittle willow (white willow × West Asian willow) Introduced

Salix ×jesupii Fern. = Salix alba × S. lucida ssp. lucida Jesup's willow (white willow × shining willow) Introduced

Salix ×meyeriana Rostk. = Salix pentandra auct. non L. = Salix pentandra × S. euxina Meyer's willow (bayleaf willow × West Asian willow) Introduced Records match those of 'S. pentandra' of MA Checklist (2011). (Photographs of a cultivated plant)

Salix ×sepulcralis auct. = Salix alba × S. babylonica golden weeping willow (white willow × Babylon willow) Introduced One of two hybrids of S. babylonica with pendulous branches. True Babylon willow does not grow this far north (see note to S. ×pendulina).

Salix ×smithiana Willd. = Salix cinerea × S. viminalis Smith's willow (ash willow × basket willow) Introduced