249] FLORA OF BOULDER, COLORADO lOI 



308. S. Saxiniontana Rydb. Rocky Mountain willow. 

 Above timberline, Arapahoe Peak, 11000-14000 ft. (Dan- 

 iels, 901). 



Wyoming and Colorado to Washington and California. 



Order 16. FAGALES. 



Family 29. BETULACEAE Agardh. Birch family. 



114. BETULA L. Birch. 



309. B. papyrifera Andrewsii (A. Nels.) Daniels [B. Andrewsii 

 A. Nets.] Andrews's canoe birch. 



A few patches in valleys on the north slope of Green 

 Mountain (Daniels, 1018). The type locality. 

 Colorado, as above. 



310. B. fontinalis Sarg. [B. occidcntalis S. Wats.]. Foun- 

 tain birch. Western red birch. 



Everywhere along streams except at high altitudes, where 

 the next takes its place, 5100-9000 ft. (Daniels, 149). Also 

 Eldora to Baltimore (Rydberg). Near Long's Peak (Coulter 

 in Wabash College Herb.). 



Alberta to Yukon; South Dakota to New Mexico arid 

 Oregon. 



311. B. glandulosa Michx. Glandular birch. Scrub birch. 

 In bogs, Eldora to Baltimore, 9000-iiOQO ft. (Rydberg): 



Ward (Cockerell). 



Greenland to Alaska; Maine to Colorado and Oregon: 

 Asia. 



115. ALNUSGaertn. Alder. 



312. A. tenuifolia Nutt. [A. incana virescens S. Wats.]. 

 Thin-leaved alder. 



Along streams throughout, 5400 (Boulder creek) -10000 ft. 

 (Daniels, 571). Also mountains between Sunshine and 

 Ward (Rydberg). 



Montana to Alaska; New Mexico to California. 



