494 SALICACEAE. 
Capsule glabrous; filaments distinct. 
Branches not drooping; leaves lariceolate. 
Leaves glabrous on both sides. . S. fragilis. 
Leaves silky on both sides when young. . S. alba. 
. S. Babylonica. 
Capsules tomentose; filaments united; leaves oblanceolate. 
River-bank shrub, with linear-lanceolate leaves. 
Low arctic shrubs, with obovate or oval obtuse leaves. 
Leaves glabrous, strongly reticulated beneath, 
Leaves densely tomentose. silky beneath. 
22k > Filaments glabrous; capsule tomentose or pubescent. 
Stigmas sessile or very nearly so. 
Leaves tomentose beneath. 
Leaves oblong-lanceolate, slender-petioled; aments expanding with the leaves. 
. 12. S. Bebbiana. 
Leaves oblanceolate, short-petioled; aments expanding before the leaves. 
5 
6 
Leaves linear-lanceolate; branches drooping. 7 
8. S. purpurea, 
g. S. fluviatilis. 
0. S. reticulata. 
1. S. vestita, 
“eH 
Leaves 2'-4' long; fruiting aments about 1’ long. 13. S. humilts, 
Leaves 1-2’ long; fruiting aments '%’ long. 14. S. tristts. 
Mature leaves glabrous or slightly silky beneath. 
Leaves oblong or oblong-lanceolate, acute. 15. S. discolor. 
Leaves elongated-lanceolate, long-acuminate. 
Capsule short-pedicelled, 114’ long; leaves black in drying. 16. S. sericea. 
Capsule slender-pedicelled, 2''-3'’ long; leaves green in drying. 17. S. petiolaris. 
Style filiform, equalling or longer than the stigmas. 
Leaves persistently tomentose or silky beneath. 
Arctic or alpine shrubs; aments unfolding with the leaves. 
Fruiting aments 1’ or less long. 
Pubescence silvery-silky. 18. S. argyrocarpa. 
Pubescence tomentose. 1g. S. desertorum. 
Fruiting aments 2’-3' long. 20. S. glauca, 
Low bog shrub; leaves oblong. 21. S. candida. 
Introduced tree; leaves linear-lanceolate, long-acuminate. 22. S. viminalis. 
Mature leaves glabrous beneath. 
Leaves 2'—3' long, shining above. 23. S. phyllicifolia. 
Leaves %'-2' long, dull; low arctic shrubs. 
Leaves oblong or lanceolate, short-petioled. 24. S. Browntt. 
Leaves elliptic or broadly obovate, long-petioled. 25. S. arctica. 
7k -k°k Filaments glabrous; capsule glabrous. 
Large shrubs, with serrate or serrulate leaves. 
Mature leaves glabrous. 
Leaves lanceolate or ovate-lanceolate, acuminate. 
Shrubs. 
Leaves green both sides, narrow; capsules 2'’-3'' long. 26. S. cordata. 
Leaves very glaucous beneath, broad; capsules 3''-5'’ long. 7. S. glaucophylla, 
Tree 30°-50° high. 28. S. Missouriensis. 
Leaves elliptic, obovate or oblong, merely acute. 
Leaves glaucous beneath; capsule slender-pedicelled. 29. S. balsamtfera. 
Leaves green both sides; capsule nearly or quite sessile. 30. S. Barclay. 
Leaves densely silky-pubescent. 31. S. adenophylia. 
Low bog shrub, with entire glabrous leaves. 32. S. myrtilloides. 
Low diffuse glabrous alpine and arctic shrubs. 
Leaves oblong or obovate, narrowed at the base; aments many-flowered. 33. S. Uva-urst. 
Leaves orbicular, cordate at the base; pistillate aments few-flowered. 34. S. herbacea. 
1. Salix nigra Marsh. Black Willow. (Fig. 1173.) 
, 
Salix nigra Marsh. Arb. Am. 139. 1785. 
A tree, with rough flaky dark brown bark, 
attaining a maximum height of about 120° and a 
trunk diameter of 3°. eaves narrowly lanceolate, 
acute or acuminate at the apex, narrowed at the 
base, short-petioled, serrulate, somewhat pubescent 
when young, glabrous and green above, somewhat 
paler, and sometimes pubescent on the veins be- 
neath when mature, 214’-5’ long, 2//-9’’ wide; 
stipules various, persistent or deciduous; aments ex- 
panding with the leaves, on short lateral branches, 
the staminate 1/-2’ long. the pistillate 114/-3’ long 
and spreading in fruit; stamens 3-7, distinct, their 
’ filaments pubescent below; scales deciduous; stig- 
mas nearly sessile; capsule ovoid, acute, glabrous, 
about twice as long as its pedicel. 
Along streams and lakes, New Brunswick to west- 
ern Ontario, Florida and California. Hybridizes with 
\%, S. alba. Wood soft, weak, light brown; weight per 
*\\\ cubic foot 28 lbs. April-May. 
Salix nigra falcata (Pursh) Torr. Fl. N. Y. 2: 209. 1843. 
Salia falcata Pursh, Fl. Am. Sept. 2: 614. 1814. 
Leaves narrower, 2''-3'’ wide, falcate, green on both sides. Massachusetts to Florida. 
