76 FLORA OF THE YELLOWSTONE NATIONAL PARK. 



Woodsia scopulina, Eaton. 



Rocky places. Rather common. Obsidian Caiion, 7600 ft. alt. ; Mt. 

 Washburne, 8500 ft. alt.; Saddle Mt., 8J00 ft. alt. ; Upper Falls of the 

 Yellowstone (Adams). 



Woodsia Oregana, Eaton. 

 With the ijreceding, 



EQUISETACEJE. 



Equisetum arvense, L. 



Swan Lake, 7400 ft. alt.; Yellowstone Lake (Adams). 



Equisetum robustum, Braun. 



Hot Sulphur Springs (Adams). 



Equisetum hiemale, L. 



Swan Lake, 7500 ft. alt. 



Equisetum variegatum, Schleicher. 



Mammoth Hot Springs, 6300 ft. alt.; Lower Geyser Basin (Coulter), 



