28 FLORA OF THE YELLOWSTONE NATIONAL PARK. 



Thelypodium sagittatum, Endl. 



]\Ieadows. West Pelicau Creek, 8000 ft. alt. ; Yellowstone Lake 

 (Coulter). Rare. 



Erysimum asperura, DC, var. inconspicuum, Wats. 



Dry bench lands. East Fork of the Yellowstone, C500 ft. alt. ; 

 Slough Creek, 6800 feet. 



Barbarea vulgaris, R. Br. 



Mammoth Hot Springs, GlOO ft. alt. ; Blacktail Deer Creek, 7200 

 ft. alt. Rare. 



Sisymbrium canescens, Xutt. 



Yellowstone Lake (Adams). 



Sisymbrium incisum, Engelm. 



Dry bench lands. Common. 



Smelowskia calycina, C. A. Meyer. 



Common on alpine summits. Mt. Holmes, 10,000 ft. alt.; Mt. Wash- 

 bui-ne, 8800 ft. alt.; Saddle Mt., 9800 ft. alt.; Stinkiugwater Pass (Parry). 



Nasturtium obtusum, Nutt. 



Indian Creek, 8000 ft, alt.; Lower Falls of the Yellowstone (Coulter). 



Nasturtium curvisiliqua, Nutt., var. lyratum, Watson. 



Mammoth Hot Springs, 6800 ft. alt.; Mirror Lake Plateau, 8900 ft. 

 alt., Yellowstone (Parry). 



Subularia aquatica, L. 



Growing submerged in ponds at the foot of Yellowstone Lake. "In 

 great abundance at head of Yellowstone Lake" (Parry); Yellowstone 

 Lake (Forwood). 



Thlaspi alpestre, L. 



Indian Creek, 8200 ft. alt. 



Lepidium intermedium, Gray. 



Common in the dryer valleys. 



Physaria didymocarpa. Gray. , 



Mammoth Hot Springs. Rare. 



VIOLACEiE. 



Viola blanda, Willd. 



Wet meadows, Buffalo Creek, 8600 ft. alt. Rare. 



