249] FLORA OF BOULDER, COLORADO IOI 



308. S. Saximontana 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. BETTILA L. BIRCH. 



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

 A. Nels.] 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. occidentalis 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 and 

 OREGON. 



311. B. glandulosa Michx. GLANDULAR BIRCH. SCRUB BIRCH. 

 In bogs, Eldora to Baltimore, 9000-11000 ft. (Rydberg): 



Ward (Cockerell). 



GREENLAND to ALASKA; MAINE to COLORADO and OREGON: 

 ASIA. 



115. ALNTJS Gaertn. ALDER. 



312. A. tenuifolia Nutt. [A. ineana mrescens 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. 



