In moist or wet places, mostly along streams and on edge of wet meadows, in 

 N.M. (widespread in mts.) and Ariz. (Apache, Navajo, Coconino and Graham 

 COS.), spring; Nfld. to Alas., s. to N.J., S.D., N.M., Ariz, and Calif. 



22. Salix Geyeriana Anderss. 



Shrub to 1 m. tall; twigs black and pruinose, glabrous to pubescent; leaves 

 without stipules; blades linear-oblanceolate to elliptic, acute at each end, 2-6 cm. 

 long, dark-green above, glaucous beneath, thinly to densely pubescent on both 

 sides, the margins entire to revolute; staminate aments oblong, 1 cm. long, on a 

 leafy peduncle; stamens 2, the filaments united at base; pistillate aments subglobose 

 to oblong, 1-2 cm. long; scales with red tips; style short or none; capsule 5-7 mm. 

 long, pubescent. 



In wet meadows and along stream borders, in Ariz. (Apache, Navajo, Coconino 

 and Yavapai cos.) ; Can. and Alas., s. to Pa. and Ariz. 



23. Salix humilis Marsh, var. rigidiuscula (Anderss.) Robins. & Fern. Narrow- 



leaved PRAIRIE WILLOW. 



Shrub 1-3 m. tall; stems clustered; branchlets yellowish to brown, pubescent to 

 glabrate; stipules lanceolate, acute, dentate, often deciduous; leaf blades oblanceo- 

 late to narrowly obovate, 3-10 (-15) cm. long, 1-2 (-3) cm. wide, acute to 

 abruptly short-acuminate, somewhat revolute, entire to somewhat undulate-crenate, 

 narrowed to the base, dark-green and often puberulent above, the lower surface 

 glaucous, somewhat rugose and more or less gray-pubescent becoming glabrate; 

 aments precocious, sessile or subsessile, oval-obovoid, 1.5-3 cm. long; scales ob- 

 lanceolate, 1.5-2 mm. long, blackish, long-villous; stamens 2, the free filaments 

 glabrous; capsules narrowly lanceolate-rostrate, 7-9 mm. long, gray-pubescent; 

 pedicels 1-2 mm. long, pubescent; styles 0.2-0.4 mm. long, equaling the divided 

 stigmas. 



In dry barrens, fields, open woods and swampy areas, in Okla. (Waterfall) 

 and n.e. Tex. (Bowie Co.), spring; from the Appalachian Plateau to the e. edge of 

 the Great Plains, w. to cen. N.D. and Tex. 



Our material is usually referred to var. rigidiuscula (Anderss.) Robins. & Fern, 

 with leaves narrowly oblanceolate to subelliptic, acute to acuminate at both ends, 

 becoming glabrate to glabrous with age. 



24. Salix Scouleiiana Barratt. Fire willow. 



Large shrub or tree to 12 m. tall and with a trunk to 4 dm. thick, usually 

 much smaller; stipules insignificant except on vigorous young shoots, eventually 

 deciduous; petioles 5-10 mm. long; blades broadly oblanceolate to obovate, 

 cuneate at base and broadly rounded to abruptly short-acuminate at apex, hairy 

 when young, at maturity usually lustrous dark-green and glabrous above, glaucous 

 and sparsely reddish-strigillose beneath, 4-8 (-12) cm. long, 1-3 (-5) cm. wide; 

 aments precocious or occasionally coetaneous, sessile or with peduncle to about 

 1.5 cm. long; scales blackish, persistent, conspicuously long-hairy; staminate 

 aments 2-4 cm. long; filaments 2, distinct, glabrous or somewhat hairy toward 

 base; pistillate aments 3-7 cm. long; capsules narrow, long-beaked, tomentose or 

 densely short-hairy, 5-8 mm. long, on pedicels about 1.5 mm. long. 



In swamps and bogs, along streams, ditches and sloughs, in N.M. (widespread 

 in mts.) and Ariz. (Apache, Coconino, Graham, Cochise and Pima cos.); Man. 

 and S.D. to Alas., s. to N.M., Ariz, and Calif. 



25. Salix phylicifolia L. 



Shrub to about 2 m. tall, branching; twigs shiny, brownish to deep-red, essen- 

 tially glabrous; stipules small, caducous; petioles usually 2-10 mm. long; blades 



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