SALICACEAE (WILLOW FAMILY) 137 



icels never more than 1 mm. long; styles 1-1.5 mm. long, brown or yellowish. 

 (S. pellita of authors, not Anders.; S. Covillei East. Zoe 5: 80. 1900; S. pach- 

 nophora Rydb. Bull. Torr. Bot. Club 31: 403. 1904.) Mountain streams 

 and wet meadows; from New Mexico and California north to Montana and 

 Oregon. The pruinose branches and oblanceolate, acuminate leaves suggest 

 S. Geyeriana very strikingly. 



X. PHYLICIFOLIAE. Much-branched alpine or subalpine shrubs, 1-3 m. high; 

 twigs short, divaricate, lustrous, brown: leaves small, elliptic-ovate, obovate 

 or oblanceolate, usually entire, bright green and shining above, pale or sub- 

 glaucous beneath, glabrous throughout, or very thinly villous beneath with 

 short silvery hairs: aments sessile, stoutish, densely compact: capsules sessile, 

 gray-pubescent; styles elongated; stigmas thick. 



Leaves broadly elliptic-ovate or obovate, mostly obtuse at the apex; 



styles 1-1.5 mm. long 26. S. chlorophylla. 



Leaves oblanceolate, acute at both ends; styles 0.5-1 mm. long . 27. S. Nelsonii. 



26. Salix chlorophylla Anders. Vet. Acad. Handl. Stockh. 6: 138. 1867. 

 Twigs glabrous, bright chestnut to deep rich brown: leaves broadly elliptic- 

 ovate or obovate, 2-3.5 cm. long, 0.8-2 cm. wide, obtuse at both ends or 

 acutish at the base and abruptly acute at the apex, entire or occasionally 

 somewhat glandular-crenulate or serrulate; petioles 2-5 mm. long, glabrous; 

 stipules none: buds large, chestnut or darker: aments appearing with the 

 leaves, 1-3 cm. long, 1-1.3 cm. wide; scales ovate, acute, clothed on both 

 sides with long white hairs: capsules ovate-conic, 4-6 mm. long; styles 1-1.5 

 mm. long, somewhat pubescent at the base; stigmas thick, mostly entire, 

 rather long. Fairly common at 2,500-4,000 m.; from New Mexico, Utah, and 

 California northward into Canada. 



27. Salix Nelsonii Ball, Bot. Gaz. 40: 379. 1905. A shrub 1-3 m. high, 

 similar to the preceding: leaves oblanceolate or rarely narrowly lanceolate, 

 acute or short-acuminate at the apex, cuneate at the base, 2-5.5 cm. long, 

 0.8-1.5 cm. wide, entire or the apical somewhat glandular-crenulate, rather 

 strongly veined on both surfaces; stipules none: pistillate aments naked 

 or sometimes with 1-3 small bracts at the base, 1.5-5 cm. long; scales black, 

 ovate, acute, clothed on both sides with long white hairs: capsules 5-6 mm. 

 long; styles 0.51 mm., somewhat pubescent at the base; stigmas, long, 

 stout, glabrous. NELSON'S WILLOW. Fairly common at high altitudes 2,500- 

 4,000 m.; from central Colorado to Alberta. 



XI. CAPREAE. Tall shrubs of wide distribution, 2-4 m. high; bark gray, 

 twigs dark brown to black: leaves rather large, lanceolate-oblong to obovate, 

 entire to crenulate or crenulate-dentate , more or less pubescent to tomentose, 

 especially beneath, glabrate in age, dark green above, glaucous and strongly 

 reticulate beneath: aments precocious, stout, dense, sessile or subsessile; scales 

 broad, blackish, long-villous: capsule gray-pubescent, long-rostrate, 7-9 mm. 

 long; pedicels 1-2.5 mm. long; styles short or none; stigmas long, divided. 



Leaves elliptic-lanceolate to oblong, obtuse or acute at base, acute or 



short-acuminate at apex 28. S. discolor. 



Leaves oblanceolate to obovate, cuneate at base, obtuse or abruptly 



acute at apex . 29. S. Scouleriana. 



28. Salix discolor Muhl. 1. c. 234. Shrub with rather stoutish brown to 

 blackish twigs, glabrous or the youngest pubescent: leaves lanceolate-oblong 

 to elliptic-oblong, acute or rounded at the base, short-acuminate at the apex, 

 4-8 cm. long, 1.5-2.5 cm. wide, shallowly crenulate-serrate to dentate, mostly 

 glabrous at maturity, dark green above, glaucous and reticulate beneath; 

 stipules mostly large, semicordate, acute, irregularly dentate: aments stout, 

 the staminate sessile, the pistillate very short-pedunculate and rather lax 

 in fruit, 3-5 or 6 cm. long, 1-2 cm. wide; scales brown or darker, oblanceolate 

 to obovate, villous with long white hairs: capsules lanceolate-rostrate, 7-9 or 

 10 mm. long, pubescent; styles 0.5 mm. long; stigmas 0,5-0.8 mm, long, entire 



