174 SAXIFRAGACEAE. 



1. Micranthes rhomboidea (Greene) Small. (Saxifraga rhomboidea 

 Greene.) Among rocks in the mountains from Mont, and Ida. to Colo. 

 Alt. 5000-12,000 ft. Gray's Peak; West Spanish Peak; near Ironton; Grand 

 Mesa; Marshall Pass; Seven Lakes; Black Rock Creek; Pike's Peak; Ft. 

 Collins; Georgetown; foot-hills, Larimer Co.; Tennessee Pass; Bear Creek 

 Divide, West La Plata Mountains; Iron Mountain; headwaters of Beaver 

 Creek; gulch west of Dixon Canon; Massif de 1'Arapahoe; near Pagosa 

 Peak; Rist Canon; mountains west of Cameron Pass; Soldier Canon; Boreas; 

 Beaver Creek; Eldora to Baltimore; Berthoud Pass; Rabbit-Ear Range, 

 Routt Co. 



2. Micranthes arnoglossa (Greene) Small. (Saxifraga arnoglossa Greene.) 

 On hills and mountains from Mont, and Wash, to Colo, and Calif. Alt. 9000- 

 12,000 ft. Mountains of Delta Co.; Marshall Pass; Silver Plume. 



3. Micranthes brachypus Small. In the mountains from Colo, to Nev. 

 Alt. 11,000-12,000 ft. Half-Moon Creek; Berthoud Pass. 



4. Micranthes arguta (D. Don.) Small. (Saxifraga arguta D. Don.; 6\ 

 denudata Nutt. ; 5\ punctata Hook., in part; not L.) In springy places and 

 along streams from Mont, and B. C. to N. M. and Calif. Alt. 8000-12,000 

 ft. Mountains between Sunshine and Ward; Villa Grove; Mt. Abram, 

 Ouray ; Dark Canon ; Wyoming line in North Park ; Georgetown ; Middle 

 Park; Grayback mining camps; near Pagosa Peak; Pike's Peak; Rabbit- 

 Ear Range ; headwaters of Clear Creek ; Silver Plume ; Clear Lake ; Berthoud 

 Pass; Upper La Plata Canon; Cameron Pass; Ruby; headwaters of Pass 

 Creek; Massif de 1'Arapahoe; Beaver Creek; Leroux Park, Graymont; 

 Gore Pass; Anita Peak. 



ii. SPATULARIA Haw. 



i. Spatularia Vreelandii Small. On the higher peaks of Mont, and Colo. 

 Mt. Evans. 



12. LEPTASEA Haw. 



Leaf-blades not spine-tipped at the apex, more or less ciliate. 



Petals suborbicular or oval, 5.5-6.5 mm. long, abruptly narrowed into short 



claws. i. L. chrysantha. 



Petals elliptic to oblong, 9-13 mm. long, clawless. 2. L. Hirculus. 



Leaf-blades spine-tipped at the apex. 



Petals white, usually spotted, oblong or oblong-lanceolate or elliptic ; plant ces- 

 pitose, not stoloniferous. 3. L. austromontana. 



Petals yellow, broadly obovate ; plant with flagelliform stolons. 



4. L. flagellaris. 



1. Leptasea chrysantha (A. Gray) Small. (Saxifraga chrysantha A. Gray) 

 On alpine peaks, among rocks, of Colo. Alt. 11,000-14,000 ft. Pike's Peak; 

 Mt. Bartlett; Central City; Gray's Peak; mountains of Estes Park; Massif 

 de 1'Arapahoe ; Berthoud Pass. 



2. Leptasea Hirculus (L.) Small. (Saxifraga Hirculus L.) On the higher 

 mountains, in wet places, from Greenl. and Alaska to Colo, and B. C; also 

 in Europe and Asia. Alt. 9000-11,000 ft. Beaver Park; Twin Lakes; 

 Caribou. 



