295] FLORA OF BOULDER, COLORADO 147 



Geum Rossii humilis of Coulter's Manual, but genuine G. 

 Rossii humilis T. & G. comes no nearer than Unalaska, the 

 type locality. A. turhinata (Rydb.) Greene is a low plant, 7-15 

 cm. high, usually i- flowered. 



At timberline, Arapahoe Peak, 11 500 ft. (Daniels, 906). 



231. HOLODISCUS Max. Meadowsweet. 



571. H. dumosus (Nutt.) Heller. [Spiraea diimosa Nutt.]. 

 Bushy me.a.dowsweet. 



Boulder County (McFarland). 



Wyoming and Utah to Colorado and Arizona. 



232. KITNZIA Spreng. Purshia. 



572. K. tridentata (Pursh) Spreng. [Purshia tridentata 

 (Pursh) DC.]. Three-toothed purshia. 



Rocky hillsides, 6500-8500 ft. ; head of Gregory Canon ; 

 north of Nederland (Ramaley). Boulder Cafion, 9000 ft. 

 (Coulter in Wabash College Herb.). 



Montana to Washington; New Mexico to California. 



233. CERCOCAKPUS H. B. K. Mountain mahog- 

 any. 



573. C. parvifolius Nutt. Small-leaved mountain mahog- 

 any. 



High mesas fronting the Flat-irons, 5700-6000 ft. (Dan- 

 iels, 172). Also from Eldora to Baltimore (Rydberg). 

 South Dakota to Montana; New Mexico to Utah. 



234. DRYAS L. 



574. D. octopetala L. White mountain avens. 



Above timberline, Arapahoe Peak, 11500-13500 ft. (Dan- 

 iels, 939). Also mountains south of Ward (Rydberg). 

 Arctic-alpine around the world. 



235. AGRIMONIA L. Agrimony. 



575. A. Brittoniana occidentalis Bickn. Western agrimony. 

 Plains, and cafions among the foothills, 5100-7500 (Bear 



Canon) ft. (Daniels, 259). 



South Dakota to Wyoming ; New Mexico to Arizona, 



