59 2 



SALICACEAE. 



VOL. I. 



Capsule subsessile; style long. 16. S.viminalis. 



Capsule distinctly pedicelled. 



Style filiform, longer than the stigmas. 



Leaves white-tomentose beneath. 17. S. Candida. 



Leaves silvery-velvety beneath. 18. S.pellita. ' 



Style short, or none. 



Leaves finely and sharply serrulate, expanding with the aments. 



Capsule short-pedicelled, blunt. 19. S.sericea. 



Capsule long-pedicelled, pointed. 20. S. petiolaris. 



Leaves crenate, crenulate or subentire. 



Leaves slender-petioled, expanding with the aments. 21. S. Bebbiana. 



Leaves short-petioled, expanding after the aments. 



Mature leaves glabrous, or somwehat loosely hairy beneath. 22. S. discolor. 

 Leaves persistently tomentose beneath. . 



Leaves distinctly petioled ; aments ^'-i^' long; middle-sized shrub. 



23. S. humilis. 



Leaves short-petioled; aments y 2 ' long; low shrub. 24. S. tristis. 



B. Low or depressed, mainly arctic, subarctic and alpine shrubs, mostly less than 3 

 high (no. 25 sometimes higher; no. 29 extending south to New Jersey and Iowa). 

 Aments sessile on the branches of the previous year. 



Capsule tomentose. 25. S. phylicifolia. 



Capsule glabrous. 26. S. obtusata. 



Aments on short lateral leafy branches. 



Capsule glabrous, or sometimes loosely hairy, not tomentose. 

 Leaves toothed. 



Leaves obovate to oblong. 27. S. Uva-Ursi. 



Leaves nearly orbicular ; branches spreading. 28. S. herbacea. 



Leaves entire. 



Style very short ; bracts not herbaceous. 29. S. pedicellaris. 



Style long ; bracts large, herbaceous. 30. S. chlorolepis. 



Capsule tomentose or villous (sometimes glabrous in no. 33). 

 Style very short or none. 



Leaves glabrous beneath when mature. 31. S.reticulata. 



Leaves permanently silky-hairy. 32. S. vestita. 



Style manifest. 



Capsule distinctly pedicelled. 



Mature leaves glabrous or nearly so. 33. 5". Barkleyi. 



Leaves persistently silvery silky beneath. 34. S. argyrocarpa. 



Capsule subsessile ; leaves entire. 



Leaves rounded and obtuse at the apex. 



Bracts obovate to oblong, dark brown or blackish. 35. S.arctica. 



Bracts oblong, yellow. 36. S. Waghornei. 



Leaves, or some of them, pointed or acute at apex. 

 Bracts yellow, yellowish or brownish. 



Capsules 2"-2j4" long; leaves green in drying. 37. S.deserlorum. 



Capsules $"-4" long ; leaves blackening in drying. 38. 5". glauca. 



Bracts dark brown or blackish. 39. .5". anglorum. 



i. Salix nigra Marsh. Black or Swamp Willow. Fig. 1451. 



Salix nigra Marsh. Arb. Am. 139. 1785. 



Salix falcata Pursh, Fl. Am. Sept. 2: 614. 1814. 



S. nigra falcata Torr. Fl. N. Y. 2 : 209. 1843. 



A tree, with rough flaky dark brown bark, attain- 

 ing a maximum height of about 120 and a trunk 

 diameter of 3. Leaves narrowly lanceolate, acute 

 or acuminate at the apex, narrowed at the base, often 

 falcate, short-petioled, serrulate, somewhat pubescent 

 when young, glabrous and green above, somewhat 

 paler, and sometimes pubescent on the veins beneath 

 when mature, 2$'-$' long, 2"-g>" wide; stipules vari- 

 ous, persistent or deciduous; aments expanding with 

 the leaves, on short lateral branches, the staminate 

 I '-2' long, the pistillate i$'-3' long and spreading in 

 fruit; stamens 3-7, distinct, their filaments pubescent 

 below ; bracts deciduous ; stigmas nearly sessile ; cap- 

 sule ovoid, acute, glabrous, about twice as long as 

 its pedicel. 



Along streams and lakes. New Brunswick to western Ontario, North Dakota, Florida and Texas. 

 Hybridizes with S. alba. Wood soft, weak, light brown ; weight per cubic foot 28 Ibs. Scythe- 

 leaved or pussy-willow. April-May. 



