bud scales more densely pilose-pubescent. From var. nevadensis it differs in its 

 densely silvery-pubescent leaves that never become glabrate or yellowish-green in 

 age, except on some vigorous shoots. 



Along streams and near bodies of water, from w. Tex. and n. Mex. to Calif., 

 n. to Colo, and Ida. 



Indians and Mexicans use the stripped branches in basket-making. 



12. Salix interior Rowlee. Sandbar willow, taray. 



Many-stemmed shrub 2-5 m. tall; branchlets slender, leafy, reddish-browrij 

 usually glabrous; stipules none; leaves essentially sessile; blades linear to linear- 

 oblanceolate, 5-14 cm. long, 5-12 (-18) mm. wide, acute to acuminate at both 

 ends, remotely and irregularly spinulose-denticulate, green on both sides but paler 

 beneath, often sericeous when young, glabrous with age; aments serotinus, 3-6 (-8) 

 cm. long, lax, 1 to 3 together terminating lateral leafy branchlets 3-10 cm. long; 

 scales lanceolate, yellowish, thinly pubescent, deciduous; stamens 2, the free fila- 

 ment pubescent at base; ovaries densely to thinly silvery-villous; capsules narrowly 

 lanceolate, 7-10 mm. long, glabrous; pedicels 0.5-1.5 mm. long; styles almost 

 obsolete; stigmas short, divided. S. longifolia Muhl. 



In alluvial soils, mostly along ditches, on sandbars and mudbars, and about 

 bodies of water, in Okla. (Alfalfa Co.), n. Tex. s. to the Rio Grande Valley and 

 N.M. (Grant Co.), spring; Potomac and Ohio valleys, n. to s. Can., w. from the 

 Miss. River across the Great Plains, s. to La., Tex. and N.M., n.w. to Yuk. and 

 Alas.; Mex. 



Most of our material is referred to the following two varieties. 



Var. pedicellata (Anderss.) Ball. Narrow-leaved sandbar willow. Differs 

 from var. interior in the narrowly linear leaves, 2-4 mm. wide, and in the ovaries 

 nearly always glabrous. S. linearifolia Rydb. 



Var. angustissima (Anderss.) Dayton. Silvery-fruited sandbar willow. 

 Differs from var. interior principally in the ovaries being densely white pilose- 

 pubescent and the capsules remaining gray pilose-pubescent even in age. 



13. Salix nivalis Hook. 



Depressed somewhat matted shrub with woody rhizomatous stems creeping at or 

 below the surface of ground, rarely to 1 dm. above ground level; stipules wanting 

 or minute and caducous; petioles mostly 2-15 mm. long; blades elliptic to obovate, 

 rounded and sometimes retuse to acutish at apex, to about 3 cm. long and 2 cm. 

 wide, glabrous, firm, dark-green above, conspicuously glaucous and reticulate- 

 veined on lower surface, entire; aments serotinous, terminating the main vegetative 

 shoots of the season; scales pale, mostly yellowish or greenish, glabrous on outer 

 surface, somewhat villous-puberulent within; staminate aments slender; filaments 2, 

 inconspicuously villous-hirsute at base; capsules 3-5 mm. long, villous-puberulent 

 or subtomentose; style and stigmas combined less than 1 mm. long S. saximontana 

 Rydb. 



Wet meadows, seepage slopes among grasses, in N. M. (Rio Arriba and Tabs 

 COS.); Alta. and B.C., s. to N.M., Ut. and Calif. 



14. Salix arctica Pall. 



Depressed somewhat matted shrub that typically creeps along surface of ground, 

 seldom to 1 dm. above ground level; stems yellowish or brown; stipules minute or 

 wanting; petiole 4-13 mm. long; blades elliptic to obovate, entire, rounded to 

 somewhat acute at apex, usually 1.5-5 cm. long and 5-20 mm. wide, loosely 

 villous at first but soon glabrate, paler and somewhat glaucous on lower surface; 

 aments appearing with leaves, on short leafy lateral branchlets, the pistillate usually 

 2-5 cm. long; scales brown to blackish, persistent, with long hairs mostly sur- 



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