285] FLORA OF BOULDER, COLORADO 1 37 



209. 0Z0MELIS Raf. Mitre-wort. 



516. 0. stenopetala (Piper) Rydb. [Mitella stenopetala Piper]. 

 Narrow-petalled mitre-wort. 



Springy places, Eldora to Baltimore (Rydberg). 

 Redrock lake, ioioo ft. (Ramaley & Robbins). 

 Colorado to Utah. 



210. HEUCHERA L. Alum-root. 



517. H. bracteata (Torr.) Ser. Bracted alum-root. 

 Common in the crevices of rocks, 5800-10000 ft. (Daniels, 



139). Also in the mountains between Sunshine and Ward, and 

 from Eldora to Baltimore (Rydberg). 

 Wyoming to Colorado. 



518. H. Hallii Gray. Hall's alum-root. 



Rocky places, Arapahoe Peak, 11 500- 12000 ft. (Daniels, 

 881). 



Colorado. 



519. H. parvifolia Nutt. Small-leaved alum-root. 

 Common on banks in the mesas, foothills, and mountains 



throughout, 5700-12000 ft. (Daniels, 98). Also at Ward and 

 Caribou (Rydberg). 

 Alberta to Oregon ; New Mexico to Arizona. 



211. SAXIFRAGA L. Saxifrage. 



520. S. debilis Engelm. Weak saxifrage. 



Wet rocks, Massif de 1' Arapahoe, 9000-13000 ft. (Ryd- 

 berg). 



Montana to Colorado and Utah. 



212. MICRANTHES Haw. 



521. M. rhomboidea (Greene) Small [Saxifraga rhomboi- 

 dea Greene]. Rhomboid-leaved saxifrage. 



Among rocks in the foothills and mountains, Flagstaff Hill, 

 6000 ft. (Daniels). Also Massif de 1' Arapahoe, 12000 ft., 

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

 (Coulter in Wabash College Herb.). Saxifraga nivalis L., re- 

 ported by Ramaley & Robbins from Redrock lake, 10100 ft., 



