36. Salix Waghornei Rydberg. Waghorne's Willow

Fig. 1486

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, 1/2'- 3/4' wide, sparingly long-hairy when young, soon glabrous, remaining green in drying, the petioles 1"-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'-12' 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, 1/2'-4' long, 2"-4" wide; stipules fugacious; aments expanding with the leaves, dense, ¥ 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. stricta (Anders.) Rydb.), differs in leaves tomentose on both sides and hairy twigs. It occurs in Quebec, and ranges otherwise from Saskatchewan to Colorado.

38. Salix Glauca L. Northern Willow

Fig. 1488

Sa!i.v glauca L. Sp. PI. 1019. 1753-

S. atra Rydb. Bull. N. Y. Bot. Gard. 1: 272. 1899.

S. labradorica Rydb. Bull. N. Y. Bot. Gard. 1: 274. 1899.

A low arctic shrub, with terete brown twigs, the young shoots and leaves densely tomentose, becoming glabrate when old. Leaves elliptic or elliptic-lanceolate, entire, obtuse or acute at the apex, narrowed at the base, 1-3' long, 1/2'-1' wide; petioles 1"-5" long; stipules deciduous; aments borne on short leafy branches, the staminate dense, about 1' long, the pistillate 2'-3' long in fruit, rather loose; stamens 2; filaments distinct; bracts persistent, yellowish or brownish, densely white-villous; capsule ovoid-conic, densely white-tomentose, sessile or very short-pedicelled, 3"-4" long; style about as long as the stigmas.

Greenland and Labrador to Alaska. Also in arctic and alpine Europe and Asia. The American races differ slightly from those of the Old World. Summer.