96 
SALICACEAE. 
Ouray; Sheep Creek, above Campton’s; Sierra Blanca; near Pagosa Peak; 
Silver Plume; timber line, Pike’s Peak; Ironton Park, nine miles south of 
Ouray; Mt. Harvard; Red Mountain, south of Ouray; Marshall’s Pass; Car- 
son; Lake Moraine; mountains above Boreas; head of Red River, Frankin; 
Hematite; Cameron Pass; southeast of Jefferson; Empire. 
26. Salix chlorophylla Anders. In mountain bogs from Lab. to Alaska, N. 
H. and Colo.—Alt. 8000-12,000 ft.—Georgetown; Clear Creek, Middle Park; 
Alpine Tunnel; mountains above Boreas; Pike’s Peak; Little Kate Basin; 
Wahatoya Canon; Buffalo Pass, Park Range; Red Mountain, south of Ouray; 
Columbine; mountains of Estes Park, Larimer Co.; Carson; Marshall Pass; 
mountains above Boreas; Cameron Pass; Rabbit-Ears, Larimer Co.; Beaver 
Creek; North Park Range, Routt Co. 
27. Salix petrophila Rydb. (S. arctica petraea Anderson) On exposed 
mountain tops from N. H. to B. C., Colo, and Utah.—Alt. 12,000-14,000 ft. 
—Gray’s Peak; near Pagosa Peak; mountains above Boreas; Mt. Howard; 
Marshall Pass. 
28. Salix saximontana Rydb. (S. reticulata Port. & Coult., in part) On 
exposed mountain tops from Wyo. to Colo, and Nev.—Alt. 9000-14,000 ft.— 
Clear Creek, Middle Park; Arapahoe Peak; Argentine Pass; Floral Moun¬ 
tain ; Georgetown; Mt. Hesperus; mountains above Cameron Pass; Gray’s 
Peak; Bald Mountain; West Spanish Peak; Mount Garfield; Sierra Blanca; 
Alpine Tunnel; Franklin; Ragged Mountain, Gunnison Co.; Ethel Peak, 
Larimer Co. 
Order 20. FAGALES. 
Staminate and pistillate flowers both in aments; fruit not with a bur or cup. 
Staminate flowers 2 or 3 together in the axils of the bracts, each with a calyx; 
pistillate flowers without a calyx. 36. Betulaceae. 
Staminate flowers solitary in the axils of each bract without a calyx; pistillate 
flowers with a calyx. 37. Corylaceae. 
Staminate flowers in aments; pistillate often solitary, the involucre becoming a 
cup or bur. 38. Fagaceae. 
Family 36. BETULACEAE Agardh. Birch Family. 
Stamens 2 ; bracts of the mature pistillate aments membranous, usually 3-lobed, 
deciduous with the nut. 1. Betula. 
Stamens usually 4 (3-6) ; bracts of the mature pistillate aments thickened and 
woody, erose or toothed, persistent. 2. Alnus. 
1. BETULA L. Birch. 
Wings of the fruit much wider than the body; trees or tall shrubs. 
1. B. fontinalis. 
Wing of the fruit usually narrower than the body; low shrubs. 2. B. glandulosa. 
1. Betula fontinalis Sarg. ( B . occidentals S. Wats.; not Hook.) Along 
streams from S. D. and Alb. to Yukon Terr., N. M. and Ore.—Alt. 5000- 
9000 ft.—Walsenburg; Garland; Engelmann Canon; foot-hills, Fort Collins; 
Livermore, Larimer Co.; South Cheyenne Canon; North Cheyenne Canon; 
Ojo; Pass Creek; foot-hills near Fort Collins; Elizabethtown; Howe’s Gulch; 
west of Rist Canon; Rist Canon; Eldora to Baltimore; Elk River, Routt Co. 
