SALICACE.E 



151 



streams in southern Arizona; southward through Mexico to Guatemala, and on the Sierra 

 de la Victoria, Lower California. 



11. Salix sessilifolia Nutt. 



Leaves linear-lanceolate to elliptic-lanceolate, acute or acuminate at apex, cuneate at 

 base, entire or furnished above the middle with a few remote apiculate glandular teeth, 

 bluish green and thickly covered with silky white hairs most abundant on the lower side of 

 the midrib, l'-2' long, '-' wide, or on vigorous summer shoots often 4' long and 1 j' wide; 

 petioles densely villose-pubescent, yV'-i' in length; stipules ovate to lanceolate, acute, en- 

 tire or denticulate. Flowers: aments appearing after the leaves, terminal on leafy 

 branchlets, densely hoary-tomentose, 1|'-2|' long; scales broadly elliptic, acute or rounded 





Fig. 145 



at apex, cuneate at base, densely villose-tomentose; stamens 2; filaments villose below the 

 middle; ovary sessile, villose, the stigmas sessile, deeply 2-lobed. Fruit ovoid-acuminate, 

 densely villose, pubescent. 



A shrub or small tree occasionally 20 high, with short hairy tomentose branchlets. 



Distribution. River banks, southwestern British Columbia; Whitcomb County, Wash- 

 ington, and on the TJmpqua and Willamette Rivers, western Oregon. Southward passing 

 into 



Var. Hindsiana Anders., a large shrub with numerous stems often 20 high, differing in its 

 more linear or narrow lanceolate usually entire leaves on longer petioles, smaller aments 

 and pubescent, not tomentose, branchlets; and distributed from the valleys of central Cali- 

 fornia to southwestern Oregon. A shrubby form of S. sessilifolia (var. leucodendroides 

 Schn.) with longer and broader leaves is common on the banks of streams in southern 

 California. 



12. Salix exigua Nutt. 



Leaves lanceolate to oblanceolate, acuminate at the ends, often slightly falcate, minutely 

 glandular-serrate above the middle, bluish green and glabrous above, covered below with 

 appressed silky white hairs, l^'-S' long, '-j' wide, or on summer shoots sometimes 4|' long 

 and 1%' wide; petioles glabrous, iV long or less; stipules minute or wanting Flowers: 

 aments terminal and solitary or terminal and axillary, on leafy glabrous branchlets, l'-2' 

 in length; scales hoary pubescent, lanceolate and acute on staminate aments, often wider, 

 obovate and rounded at the apex on pistillate aments; stamens, 2, filaments hairy 



