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; La^e Moraine; mountains above Boreas; head of Red River, Frankin; 

 Hematite r 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. i. Betula. 



Stamens usually 4 (3-6) ; bracts of the mature pistillate aments thickened and 

 woody, erose or toothed, persistent. ij. Alnus. 



I. BETULA L. Birch. 



Wings of the fruit much wider than the body ; trees or tall shrubs. 



1. S. fotitinalis. 

 Wing of the fruit usually narrower than the body ; low shrubs. 2. B. glandulosa. 



1. Betula fontinalis Sarg. (B. occidentalis 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 Cafion; foot-hills. Fort Collins; 

 Livermore, Larimer Co. ; South Cheyenne Cafion ; North Cheyenne Caiion ; 

 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. 



