46 American Midland Naturalist Monograph No. 4 



shaped, abruptly pointed at the tips, 2 to 6 inches long; leaves of flowering 

 branches at first short, % to lI^ inches long, narrowly elliptic-oblong; catkins 

 appearing before the leaves, naked at base, not stalked; scales brownish, densely 

 white-hairy; stamens 2, the filaments distinct; capsules smooth, short-stalked, 

 the style short. 



Occurrence. — rocky mountain, 7,500 to 8,500 feet: west of Mount Bryant. 



12. Barrenground Willow (Salix brachycarpa Nutt.). — Small shrub 

 6 inches to 3 feet high, forming clumps; foliage yellow-woolly or becoming 

 smooth; leaves elliptic-oblong to reverse-lance-shaped, % to 1^4 inches long; 

 catkins borne on short leafy branchlets; scales yellowish, persistent, hairy; 

 stamens 2, the filaments hairy below; capsules woolly, scarcely stalked, the 

 styles 1 to ly2 inm. long. (Syn. S. stricta (Anderss.) Rydb.). 



OccuTTence. — GLACIER, occasional above timberline: Piegan Pass; Appekunny Creek. 

 YELLOWSTONE PARK: Lower Geyser Basin; Yellowstone Falls; Soda Butte Creek. 

 GRAND TETON: head of Granite Canyon, 9,000 feel. ROCKY MOUNTAIN, 7,500 to 1 1,500 

 feet: Trail Ridge; Estes Park. 



13. Geyer Willow (Salix Geyeriana Anderss.). — Spreading shrub 3 

 to 12 feet high; leaves 1 to 2^/2 inches long, narrowly lance-shaped, thinly 

 silky-hairy on both sides, the margins not toothed; catkins lax, appearing with 

 the leaves, borne on short stalks; scales yellowish, soon falling; stamens 2, 

 the filaments hairy below; capsules hairy, the style almost none. (Syn. S. 

 macrocarpa Nutt.). 



Occurrence. — MOUNT RAINIER, rare, in open woods near streams: swamps in Nis- 

 qually Valley. GLACIER: Ballon, 3,100 feet. YELLOWSTONE, occasional: between 

 Mammoth and Gardiner; Tower Junction. GRAND TETON. ROCKY MOUNTAIN, 7,500 

 feet to 9,000 feet: Esles Park. ZION, in cool canyons on the plateaus. 



13a. Silvery Geyer Willow (Var. argentea (Bebb) Schn.). — Leaves 



silky below; capsules borne in roundish catkins about 1/3 to % inch long. 



Occurrence. — YOSEMITE, 7,000 ot 9,000 feet: Lyell Fork Merced River near Mount 

 Lyell; Tuolumne Meadows. SEQUOIA, 8,000 to 9,000 feet: Whitney Meadows. YEL- 

 LOWSTONE. ROCKY MOUNTAIN, common, 7,500 to 9,000 feet. 



14. Bebb Willow (Salix Bebbiana Sarg.). — Slender shrub with stems 

 clustered at the base, 6 to 12 feet high, often occurring with shrubby vegeta- 

 tion on open mountain slopes; leaves 1 to 2 inches long, elliptic to broadly 

 lance-shaped, dull green above, somewhat paler below, more or less gray- 

 woolly at least below (becoming smooth in var.), the margins not toothed 

 or scarcely so, often somewhat wavy; catkins lax, appearing with the leaves; 

 scales pale, persistent; stamens 2, the filaments not hairy; capsules thinly 

 hairy, the styles less than 1/2 ititi. long or none. (Syn. S. rostrata Rich.). 



Occurrence. — glacier, common, 3,100 to 6,000 feet: Belton Hills; outlet to Bow- 

 man Lake; Skylme Trail to Granite Park; Blackfeet Highway near Two-Medicine 

 Ridge. 



14a. Smooth Bebb Willow (Var. perrostrata (Rydb.) Schn.). — Dif- 

 fers from species in having leaves thinner and soon becoming smooth. 



Occurrence. — GLACIER: with the species. YELLOWSTONE: along streams at Mammoth; 



