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 icith 

 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 0.5-1 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 



