48 FLORA OF THE YELLOWSTONE NATIONAL PARK. 



Artemisia scopulorum, Oray. 

 Common on alpine slopes. 



Artemisia frigida, Willd. 



Common about Blacktail Deer Creek and Mammoth Hot Springs, 

 GOOO-7500 ft. alt. ; but rather less common elsewhere. 



Artemisia Ludoviciana, Nutt. 

 With A. dracunculoides. 



Artemisia discolor, Dougl. 



Indian Creek, 7600 ft. alt. 



Artemisia discolor, Dougl., var. incompta, <iray. 

 Lower Geyser Basin (Coulter). 



Artemisia arbuscula, Nutt. 



Mammoth Hot Springs, G200 ft. alt. ; Hayden Valley, 8000 ft. alt. 



Artemisia tridentata, Nutt. 



Common on nearly all the dry open areas up to about 8500 ft. alt. 



Artemisia cana, Pursh. 



With the preceding, and perhaps more ajbundant. 



Tetradymia canescens, DC. 



Gardiner, G300 ft. alt. Rare in tlie Park. 



Arnica cordifolia, Hook. 



Common in open woods from 6000-9000 ft. alt. 



Arnica latifolia, Bong. 



With the preceding, but less common. 



Arnica Chamissonis, Less. 



Along streams in open woods. Pelican Cone, 8600 ft. alt.; Wet woods, 

 Mirror Lake Plateau, 8800 ft. alt.; Yellowstone Falls and Yellowstone 

 Lake (Adams). Rather local. 



Arnica longifolia, Eaton. 



Dry washes along Cache Creek, 6800 ft. alt , and Pebble Creek, 8000 

 ft. alt. 



Arnica foliosa, Nutt. 



Generally with A. Chamissonis. Meadows, Blacktail Deer Creek, 

 7400 ft. 



