496 



SALICACEAE 



17. Salix monochroma Ball. One-colored Willow. 



Fig. 



1206. 



Salix monochroma Ball, Bot. Gaz. 71: 431. /. 1. 1921. 

 Salix pvrifolia as interpreted by Ball in Coulter and 



Nelson, Man. Rocky Mtn. Botany 131. 1915, not 



Anderss. 



Shrub 1-3 m. high; twigs glabrous, bright 

 chestnut to brown, lustrous ; leaves ovate- 

 lanceolate, ovate, or obovate-oval, abruptly, 

 cuspidate to short-acuminate at the apex, 

 rounded or cordate at the base, 3.5-7 cm. long, 

 1.5-3.5 cm. wide, shallowly glandular-serru- 

 late, thin, translucent, pure dark green and 

 reticulate with slender veins on both sides ; 

 stipules lunate or broadly ovate ; peduncles 

 short, leafy; aments coetaneous, long, lax; 

 the staminate slender, flexuous, 4-6 cm. long, 

 8-10 mm. wide ; filaments glabrous, united for 

 one-third to three-fourths their length; pistil- 

 late aments 3-6 cm. long, 1.2-1.8 mm. wide; 

 capsules 4-7 mm. long, glabrous ; pedicels 2.5- 

 4 mm. long, about three times as long as the 

 scales ; styles 0.3-0.7 mm long ; stigmas usually 

 deeply divided. 



Mountains, Transition and Canadian Zones; south- 

 ern Alberta to Oregon, east of the Cascade Mountains 

 (sparingly in the Willamette Valley of western Ore- 

 gon), east to western Montana and Colorado, up to 

 elevations of about 6,000 feet. Type locality: "valley 

 of Hatwai Creek, Nez Perce County, Idaho." 



18. Salix pseudomyrsinites Anderss. Firm-leaf Willow. Fig 1207. 



Salix pseudomyrsinites Anderss. Oefv. Vet. Akad. Foer- 



handl IS: 129. 1858. (Nord. Am. Pil.); Sal. Bor. Am. 



25. 1858. 

 Salix pseudocordata, in part, of authors. 



Shrub 1-3 m. high ; twigs mostly divaricate, leafy, 

 bright chestnut to dark brown, lustrous ; leaves 

 elliptic-oblanceolate to lanceolate-oblong, acute to 

 acuminate at the apex, mostly rounded at the base 

 (or oval-oblong and subcordate at base) ; 2)-6 cm. 

 long, 1-2 cm. wide, shallowly glandular-serrulate 

 or subentire, dark green above, pure green, scarcely 

 paler and coarsely reticulate with broad veins be- 

 neath ; stipules lanceolate to ovate ; peduncles 0.5-1 

 cm. long, leafy; aments coetaneous, small, 2-3 cm. 

 long in both sexes ; scales oblong or oblanceolate, 

 acutish to truncate, thinly white-pilose ; capsules 

 greenish, 4-5 mm. long; pedicels 1-1.5 mm. long, 

 usually pubescent ; styles 0.5-0.7 mm. long ; stigmas 

 thick, entire ; stamens 2, filaments glabrous, free. 



Southern British Columbia through Washington and 

 Oregon, east of the Cascade Mountains, and in the high 

 Sierras of California, east to Saskatchewan and south in the 

 Rockies to New Mexico. Up to 10,000 or 12,000 feet eleva- 

 tion in the south, and perhaps a distinct variety, smaller in 

 every way, with shorter, broader leaves. Type locality: "on 

 the Grand Rapid of the Saskatchewan." 



19, Salix lasiolepis Benth. 

 Arroyo Willow. Fig. 1208. 



Salix lasiolepis Benth. PI. Hartwg. 335. 1857. 



Shrub or small tree 2-12 m. high, stems clustered, 

 branchlets brownish-black, sometimes yellowish, 

 usually pubescent ; leaves narrowly to broadly ob- 

 lanceolate, 6-10 cm. long, 1-2 cm. wide, pubescent to 

 glabrate and glaucous beneath, margins nearly en- 

 tire and somewhat revolute ; aments precocious, sub- 

 sessile, i-7 cm. long ; scales obovate, dark brown, 

 densely pilose-tomentose; capsule 4-5.5 mm, long, 

 glabrous ; pedicel 0.5-1 mm. long, style 0.5 mm. 

 long ; stamens 2, filaments united at base. 



Rocky stream banks, up to about 5,000 feet, Upper So- 

 noran and Transition Zones; eastern Washington and adjacent 

 Idaho to California, western Nevada, Arizona, western New 

 Mexico' and Mexico. Type locality: "ad ripas fluviorum Sa- 

 linas et Carmel prope Monterey," California. 



