WILLOW FAMILY 191 



1. S. nigra Marsh. A tree 10-20 m., rarely 30-40 m. high; leaf-blades 

 6-12 cm. long, bright green on both sides, finely serrate, usually more or less 

 falcate; aments appearing with the leaves, the staminate ones 4-6 cm. long; 

 bractlets ovate, finely villous; pistillate aments 4-8 cm. or in fruit 10-12 cm. 

 long; bractlets oblong, finely pubescent; capsule about 3 mm. long; stipe 1-1.5 

 mm. long. Black Willow. River banks and wet places: X.B. — Fla. — Te.x. — 

 N.D. Plain. Ap-My. 



S. amygdaloides X nigra Glattf. This hybrid is intermediate between the two 

 parents, with narrower leaves, less glaucous beneath, and with, shorter petioles than in 

 S. amygdaloides, but broader leaves and with longer petioles than in S. nigra. In the 

 eastern part of the range. 



2. S. Wrightii Anders. A tree 8-10 m. high; bark of the stem flaky, gray; 

 leaf-blades 5-15 cm. long, light and usually yellowish green above, paler and 

 sometimes glaucous beneath, finely serrate; aments 2-7 cm. long; bractlets of 

 the staminate aments ovate, finely pubescent, those of the pistillate ones oblong; 

 capsule about 4 mm. long; stipe 1-2 mm. long. River banks: Tex. — Colo. — 

 Nev. — s Calif. ; n Mex. Son. — Submont. Ap-My. 



3. S. amygdaloides Anders. A tree up to 20 m. high; twigs yellowish; 

 leaf-blades 8-12 cm. long, acuminate, finely serrate, paler and somewhat glau- 

 cous beneath; aments 3-5 cm. long; bractlets oblong or lanceolate, somewhat 

 pubescent; capsule about 5 mm. long; stipe 1-2 mm. long. Peach-leaved 

 Willow. River and lake banks: Que. — N.Y. — Mo. — Tex. — Ariz. — Ore. — -B.C. 

 Plain — Suhmont. Ap-My. 



4. S. laevigata Bebb. A tree 5-15 m. high; trunk with bro^^Ti fissured 

 bark; twigs yellowish, pubescent when young; leaves lanceolate or lance-oblong, 

 acute or acuminate, 7-15 cm. long, dark green and glossy above, pale or glaucous 

 beneath, minutely serrate; aments 5-10 cm. long; bractlets villous, dentate, in 

 the staminate aments obovate, in the pistillate ones narrower; stipe 3 to 4 times 

 as long as the glands. Along streams: Ore. — Utah — Calif. Son. Ap-Je. 



5. S. erythrocoma Barrett. A shrub or small tree (?); bark of the twigs 

 dark, purphsh brown; leaf -blades 3-5 cm. long, finely glandular-serrate, reddish 

 pubescent when young, in age glabrate on both sides; aments 2-4 cm. long. S. 

 arguta erythrocoma Anders. Banks of rivers and lakes: Man. — B.C. — Mack. 



6. S. serissima (Bailey) Fern. A shrub 2-4 m. high; leaf-blades lanceo- 

 late, acute or acuminate, when mature dark green, shining above, pale beneath, 

 thick and firm, 4-10 cm. long, closely and finely glandular-serrate; aments 1-2.5 

 cm. long; capsules 7-12 mm. long. S. palle.scens hirtisquama Anders. Autumn 

 Willow. Swamps: Mass. — N.J. — Wis. — Minn. — Sask. Boreal. ^Mj'-Jl. 



7. S. lucida Muhl. A tall shrub or sometimes a tree 6-8 m. high; leaf- 

 blades mostly abruptl}' long-acuminate, acute or rounded at the base, sharply 

 glandular-serrate, green and shining, slightly paler beneath, 7-12 cm. long; 

 aments 2-5 cm., or the pistillate even 7 cm. long; bractlets sparingly pubescent; 

 capsule 5 mm. long. Shining Willow. Swamps and banks: Newf. — N.J. — • 

 Ky.— Neb.— Alta. Boreal. Ap-My. 



8. S, Fendleriana Anders. A shrub or small tree, rarelj^ 10 m. high; leaf- 

 blades lanceolate, long-acuminate, finely glandular-dentate, acute at the base, 

 6-15 cm. long; aments 2-5 cm. long; bractlets toothed towards the apex; stamens 

 5-9; capsule 5 mm. long. S. lasiandra caudata (Nutt.) Sudw. Along mountain 

 streams: B.C.— Alta.— (Black Hills) S.D.—N.M.— Calif. Submont.— Mont. 

 Ap-My. 



9. S. Lyallii (Sarg.) Heller. A tree sometimes 20 m. high; bark brown or 

 of the twigs yellow; leaf -blades broadly lanceolate, more or less acuminate, finely 

 glandular-serrate, 6-20 cm. long; aments 4-8 cm. long, or the pistillate ones 

 sometimes 10 cm. long; bractlets toothed above; stamens 5-8; capsule about 6 

 mm. long. S. lasiandra Lyallii Sarg. River and lake banks: B.C. — Yukon — 

 Mont. — Calif. Submont. Ap-My. 



10. S. alba L. A large tree sometimes 30 m. high; leaf-blades serrulate, 

 silky-pubescent on both sides when 3^oung, pale beneath, 5-12 cm. long; aments 

 on short leafy branches, 3-6 cm. long, 4-5 mm. thick; bractlets of the staminate 



