FLORA OF THE YELLOWSTONE NATIONAL PARK. 29 



Viola canina, L., var. rupestris, Regel. 



Rather common in meadows from 6000-8000 ft. alt.; Slough Creek, 

 7700 ft. alt.; Swan Lake, 7500ft. alt.; Pelican Creek, 8200 ft. alt. 



Viola Canadensis, L. 



Soda Butte Creek, 8200 ft. alt. Rare. 

 Viola Nuttallii, Pursh. 



Mammoth Hot Springs, 6400 ft. alt. Rare. 



C ARYOPH YLL ACE JE. 



Silene Douglasii, Hook. 



Grassy slopes, 7600-9000 ft. alt. Common. 

 Silene acaulis, L. 



Rather common on alpine summits. Mt. Holmes, 10,000 ft. alt.; Mt. 

 Chittenden, 9800 ft. alt. "Mountains along Yellowstone Lake" 

 (Adams). 



Lychnis Drummondii, Wats. 



Wooded slopes, Pebble Creek, 8000 ft. alt.; Yellowstone and Heart 

 Lakes (Coulter); Upper Falls of the Yellowstone (Adams). 



Lychnis Parryi, Wats. 



Grassy slopes with Silene Douglasii. Rather common 

 Cerastium arvense, L. 



Very common, from 6000-10,000 ft. alt. 

 Stellaria umbellata, Turcz. 



Common in bogs, from 6000-9000 ft. alt. 

 Stellaria longipes, Goldie. 



With the preceding. Rather dry places, Bison Peak, 8800 ft. alt. 

 (a very glaucous form). 



Stellaria crassifolia, Ehrhart. 



Mt. Washburne, 9600 ft. alt. Rare. 

 Stellaria borealis, Bigelow. 



Open and wooded bogs. Indian Creek, 8000 ft. alt.; Upper Falls of 

 the Yellowstone (Adams). 



Arenaria congesta, Nutt., var. subcongesta, Watson. 



Very common everywhere, from 6500-9.~)00 ft. alt. 

 Arenaria pungens, Nutt. 



Bare gravelly ridges, Mt. Norris, 9800 ft. alt. 

 Arenaria verna, L., var. hirta, Watson. 



Bed of dry creek, Soda Butte, 7500 ft. alt,; Mt. Holmes, 10,000 ft. 

 alt. 



