172 SAXIFRAGACEAE. 



4. OZOMELIS Raf. MITRE-WORT. 



Petals 3-fid to the middle ; hypanthium with the sepals 3-5 mm. long. 



i. O. stauropetala. 



Petals entire or 3-fid only at the apex; hypanthium with the sepals 1.5-3 mm - long. 

 Hypanthium with the sepals 2-3 mm. long ; leaf-blades indistinctly lobed and 



with shallow crenulations ; petals often entire. 2. O. stenopetala. 



Hypanthium with the sepals 1.5-2 mm. long; leaf-blades distinctly lobed and 

 deeply crenate ; petals 3-cleft. 3. O. Parryi. 



1. Ozomelis stauropetala (Piper) Rydb. (Mitella stauropetala Piper; M. 

 trifida Coulter, in part.) In springy places in the woods from Mont, and 

 Wash, to Colo, and Ore. Alt. about 10,000 ft. Mt. Hesperus. 



2. Ozomelis stenopetala (Piper) Rydb. (Mitella stenopetala Piper) In 

 springy places in Utah and Colo. Alt. 8000-10,000 ft. Mt. Hesperus ; Eldora 

 to Baltimore. 



3. Ozomelis Parryi (Piper) Rydb. (Mitella stenopetala Parryi Piper) 

 Mountains of Wyo. and Colo. Alt. about 9500 ft. Trapper's Lake. 



5. HEUCHERA L. ALUM-ROOT. 



Stamens equalling or exceeding the sepals. 



Panicle open, not spike-like ; plant tall ; hypanthium very oblique. 



1. H. hispida. 

 Panicle contracted, dense, spike-like ; plant low ; hypanthium not very oblique. 



2. H. bracteata. 

 Stamens much shorter than the sepals. 



Hypanthium campanulate, yellowish or pinkish ; sepals almost erect. 



3. H. Hallii. 

 Hypanthium saucer-shaped, greenish ; sepals spreading. 4. H. parvifolia. 



1. Heuchera hispida Pursh. In woods and on hillsides, Ont. to Ass., Va. 

 and Colo. Edgerton. 



2. Heuchera bracteata (Torr.) Ser. On rocky ridges in Colo, and northern 

 Wyo. Alt. 6000-10,000 ft. Rist Canon ; Grand Lake ; Georgetown ; Andrew's 

 Shetland ranch; foot-hills, Larimer Co.; Gray's Peak; North Cheyenne 

 Canon; Boulder Canon; road between Denver and Idaho City; Horsetooth 

 Mountain; mountains between Sunshine and Ward; Eldora to Baltimore; 

 Berthoud Pass; between Denver and Idaho City; Golden; Empire. 



3. Heuchera Hallii A. Gray. On rocky ridges in Colo. Alt. 7000-12,000 ft. 

 Mt. Garfield ; Cameron's Cone ; Pike's Peak ; Rock Mountain Pass ; George- 

 town ; Ruxton ; Pike's Peak ; Cheyenne Mountain ; Bald Mountain ; Grand 

 Canon of the Arkansas; Graymont. 



4. Heuchera parvifolia Nutt. On hills from Alb. and Ore. to N. M. and 

 Ariz. Alt. 6000-13,000 ft. Mt. Abram, Ouray; foot-hills, Larimer Co.; 

 Cameron Pass ; Howe's Gulch ; Minnehaha ; Marshall Pass ; Colorado 

 Springs; Douglass Mountain, Georgetown; Van Boxle's ranch, above Cimar- 

 ron; Halfway House; Chicken Creek, West La Plata Mountains; 

 Grizzly Creek; near La Veta; Ojo; Cumberland Basin; Upper La Plata 

 Canon; North Cheyenne Canon; near Pagosa Peak; Ironton; Wahatoya 

 Canon; Veta Pass; Mt. Princeton; West Spanish Peak; Ward, Boulder Co.; 

 Red Mountain; Manitou; Lake City; Caribou; Dillon Canon, Trinidad; Estes 

 Park; Empire; northeast of Boreas; Spring Canon; Dixon Canon; Horse- 



