SALICACEAE. 319 



cespitose shrub, 1-2 dm. high, much branched, with short stout branches and 

 dark brown or purplish bark. Leaves crowded, obovate, when young covered with 

 long white hairs, soon glabrate above, more tardily so below, entire, obtuse, bright 

 green; petioles short, 2-5 mm. long; aments short and very dense, oblong-obovoid; 

 capsule ovoid, densely white-villous. Geeenland, Baffin Bay region, and Labrador. 



39. Salix arctica Pall. ARCTIC WILLOW. GROUND WILLOW. (I. F. f. 

 1197.) A low branching shrub, 1-3 dm., seldom 1-2 m., high, the twigs terete or 

 nearly so. Leaves glabrous, elliptic or broadly obovate, entire, obtuse and usually 

 rounded at the apex, narrowed or rounded at the base, long-petioled, pale and 

 glaucous beneath; petioles slender, 1-3 cm. long; aments dense, oblong; capsule 

 conic, villous. Arctic America and Asia. Summer. 



40. Salix anglorum Cham. ROBERT BROWN'S WILLOW. (I. F. f. 1196.) 

 A low, branched shrub with prostrate branches, the twigs 4-angled, slender. Leaves 

 glabrous, slightly silky when young, acute or the lower obtuse at the apex, entire 

 or wavy, narrowed at the base, the lower surface pale or glaucous, the margins not 

 revolute; petioles only 10-15 mm. long ; stipules narrow, deciduous ; capsule ovoid - 

 conic, tomentose, acute, about 5-8 mm. long. Labrador, Greenland and Anticosti 

 to Alaska. Summer. (S. Broumii Bebb.) 



41. Salix vacciniformis Rydb. BLUEBERRY WILLOW. A small shrub, with 

 numerous ascending, light brown branches, which are glabrous, or very soon glabrate ; 

 leaves small, resembling those of Vacdnium uliginosum, about 2 cm. long, dark 

 and shining above, paler beneath; aments 2-3 cm. long, rather loose; capsule 7-8 

 mm., loosely villous, ovoid. Anticosti, Hudson Bay and Labrador. (S. Macounii 

 Rydb. ; not S. Richardsonii Macoimiana Bebb. ) 



42. Salix callicarpaea Trautv. TRAUTVETTER'S WILLOW. A very low de- 

 pressed shrub with the habit of S. Uva-ursi, with light yellow glabrous twigs; leaves 

 small, about 1.5 cm. long and I cm. wide, bright green above, a little glaucous 

 beneath, strongly reticulated; petioles 1-5 mm. long; aments about 2 cm. long, 

 dense; capsule 4-6 mm., grayish tomentose, ovate. Mt. Gaspe, Quebec and Lab- 

 rador. 



43. Salix glaiica L. NORTHERN WILLOW. (I. F. f. 1192.) A low arctic 

 shrub, with terete brown twigs, the young shoots and leaves densely silky, becom- 

 ing glabrate when old, turning black in drying. Leaves elliptic or obovate, entire, 

 obtuse or acute at the apex, narrowed at the base, 3-7 cm. long, 1-2 cm. wide; 

 petioles i-io mm. long; stipules deciduous; the staminate aments dense, about 

 2 cm. long, the pistillate 4-7 cm. long in fruit, rather loose. Arctic America from 

 Labrador to Alaska. Also in arctic and alpine Europe and and Asia. Summer. 



44. Salix Waghornei Rydb. WAGHORNE'S WILLOW. A low shrub, 1-3 

 dm. high, with brown shining bark; branches at first slightly silky, soon glabrate; 

 leaves 2-3 cm. long and 1.5-2 cm. wide, at first somewhat silky, soon glabrate, 

 obtuse or rounded at the base, rounded at the apex, light green above, slightly 

 glaucous beneath, thin, entire; petioles 1-5 mm. long; aments dense, short; the 

 staminate ones 1-2 cm. long; pistillate in fruit 2-2.5 cm. Labrador. August. 



45. Salix atra Rydb. BLACKENING WILLOW. A low shrub, with ascending 

 dark brown branches, which are more or less villous when young; leaves small, 

 1.5-2.5 cm. long, when young covered with long white appressed hairs, dark green 

 above, pale beneath, blackening in drying; aments 1.5-3 cm. long, rather dense; 

 capsule ovoid. Labrador and Hudson Bay. 



46. Salix stricta (Anders.) Rydb. DRUMMOND'S WILLOW. (I. F. f. 1191.) 

 A shrub, 2-5 dm. high, with purplish -green or yellowish twigs. Leaves oblong or 

 oblanceolate, acute at the apex and cuneate at the base or the lower obtuse at 

 both ends, entire or nearly so, short-petioled, tomentose on both sides or glabrate 

 above when old, 15 cm. long, 4-8 mm. wide; stipules fugacious; aments expand- 

 ing with the leaves, dense, 1-2 cm. or less long, leafy-bracted at the base; capsule 

 ovoid-conic, acute, densely tomentose, about 5 mm. long. Anticosti and Quebec 

 to western arctic America, south along the Rocky Mountains to Colo. Summer. 

 (S. desert or um Bebb; not Richards.) 



47. Salix Labradorica Rydb. LABRADOR WILLOW. A low shrub; older 

 bark dark brown and shining; young shoots more or less densely villous; leaves 

 broadly ovate, often obtuse or subcordate at the base, firm, dark and glossy above, 

 more or less glaucous beneath, on both surfaces invested with villous hairs, blacken- 



