FLORA OF THE YELLOWSTONE NATIONAL PARK. 45 



Aster elegans, Torr and Gray. 



With the preceding, but less frequent. Antelope Creek, 8000 ft. alt. ; 

 Mirror Lake Plateau, 8800 ft. alt. ; Hot Sulphur Springs (Adams) ; 

 Yellowstone (Parry). 



Aster pulchellus, Eaton. 



Common on wet subalpine slopes, from 9000-10,000 ft. alt. 



Aster canescens, Pursh. 



Sandy shore of Yellowstone Lake near Pelican Creek ; Alum Creek 

 (Forwood) ; Yellowstone (Parry). Rather rare. 



Erigeron uniflorus, L. 



Alpine and subalpine. Common throughout. Frequently with 

 white rays. 



Erigeron lanatus, Hook. 



With the preceding, but less common. 



Erigeron salsuginosus, Gray. 



Moist meadows and graesy slopes, 8000 ft. alt. to alpine. Mt. Wash- 

 burne, 9500 ft. alt., an alpine form with white rays (128). Extremely 

 common. 



Erigeron salsuginosus, Gray, var. angustifolius, Gray. 



Mt. Norris, 9500 ft. alt. ; head of East Pelican Creek, 8600 ft. alt. 



Erigeron macranthus, Nutt. 



Grassy slopes and border of woods, from 6000-9000 ft. alt. Fre- 

 quent. Gardiner River, 6000 ft. alt. ; Mt. Washburne, 8500 ft. alt. 

 Shoshone Lake, 7600 ft. alt. 



Erigeron glabellus, Nutt. 



Mammoth Hot Springs, 6200 ft. alt. Rare. 



Erigeron compositus, Pursh. 



Slough Creek, 7200 ft. alt. ; Upper Falls of the Yellowstone 

 (Adams). Rare. 



Erigeron compositus, Pursh., var. discoideus, Gray. 



Bare ridges and slopes, from 6000 ft. alt. to alpine. The common form. 



Erigeron peucephyllus, Gray. 



Dry volcanic soil, Junction Butte, 6300 ft. alt. Rare. 



Erigeron ur sinus, Eaton. 

 Yellowstone (Parry). 



