604 



SALICACEAE. 



Vol. I. 



35. Salix arctica Pall. Arctic Willow. 

 Ground Willow. Fig. 1485. 



Salix arctica Pall. Fl. Ross. 1 : Part 2, 86. 1788. 



A low branching shrub, rarely 6' high, the 

 twigs terete or nearly so. Leaves glabrous, elliptic 

 or broadly obovate, entire, obtuse and usually 

 rounded at the apex, narrowed or rounded at the 

 base, long-petioled, pale, glaucous and reticulate- 

 veined beneath, 1-2' long, Y-\Y wide, often dark- 

 ening in drying; petioles slender, i'-ii' long; 

 aments borne at the ends of short leafy branches, 

 very dense, the pistillate 1-2' long in fruit; bracts 

 dark purple-brown, oblong to obovate, obtuse, 

 white-villous, persistent; stamens 2; filaments 

 glabrous; style filiform, longer than the stigmas; 

 capsule conic, villous, very short-pedicelled. 



Quebec ; Arctic America and Asia. Summer. 



Salix callicarpaea Trautv., of Labrador and re- 

 corded from Quebec, has broadly obovate leaves 

 which do not darken in drying. 



36. Salix Waghornei Rydberg. Waghorne's 

 Willow. Fig. i486. 



.S - . cordifolia Hook. Fl. Bor. Am. 2: 152. 1840. Not 



Pursh, 1814. 

 ■S\ Waghornei Rydberg, Bull. N. Y. Bot. Gard. 1 : 271. 



1899. 



A low shrub, 1° high or less, with smooth shining 

 twigs, sparingly pubescent when young. Leaves 

 obovate or elliptic-obovate, rather thin, entire, about 

 1' long, Y-i' wide, sparingly long-hairy when young, 

 soon glabrous, remaining green in drying, the petioles 

 i"-4" long, the stipules deciduous; aments on 

 lateral leafy branches, the pistillate about 1' long in 

 fruit, the staminate shorter; bracts yellow, oblong, 

 obtuse, silky-hairy; capsule short-stalked, white- 

 tomentose, conic, 2"-$" long; style about as long as 

 the stigmas. 



Labrador. Summer. 



37. Salix desertorum Richards. Desert or Prairie Willow. Fig. 1487. 



Salix desertorum Richards. Frank. Jour. App. 371. 

 1823. 



A shrub, 6'-i2' high, with purplish-green gla- 

 brate twigs. Leaves oblong or oblanceolate, acute 

 at the apex and cuneate at the base or the lower 

 obtuse at both ends, entire or very nearly so, 

 very short-petioled, tomentose beneath or gla- 

 brate when old, i'-a' long, 2"-4" wide; stipules 

 fugacious; aments expanding with the leaves, 

 dense, Y or less long, leafy at the base; stamens 

 2; filaments glabrous; style about as long as the 

 deeply 2-cleft stigmas; capsule ovoid-conic, acute, 

 densely tomentose, about 2" long, very short- 

 pedicelled. 



Anticosti and Quebec to western arctic America. 

 Summer. 



Salix brachycarpa Nutt. (S. striata (Anders.) 

 Rydb.), differs in leaves tomentose on both sides and 

 hairy twigs. It occurs in Quebec, and ranges other- 

 wise from Saskatchewan to Colorado. 



