FLORA OP THE YELLOWSTONE NATIONAL PARK. 49 



Arnica Parryi, Gray. 



Pine woods, East Pelican Creek, 8200 ft. alt.; Yellowstone (Parry). 

 Rare. 



Arnica alpina, Olin. 



Common on subalpine and alpine slopes. On rocky ridges and sum- 

 mits along East Fork, 8500-9000 ft. alt,, occurs a 3-ccplialous form. 



Senecio Fremonti, Torr. and Gray. 



Slides along Soda Butte Creek, 8200 ft. alt. Rare. 



Senecio triangularis, Hook. 



Common in bogs and wet meadows, from 7000-9000 ft. alt.; Red Mt., 

 10,000 ft. alt. (Coulter). 



Senecio serra, Hook., var. integriusculus, Gray. 



Turbid Lake, 7900 ft. alt.; Shoshone Lake (Coulter). 



Senecio crassulus, Gray. 



Bogs, Pebble Creek, 8000 ft. alt. ; Indian Creek, 8000 ft. alt. Frequent. 



Senecio hydrophilus, Nutt. 



Brackish marshes and muddy shores. Mammoth Hot Springs, 6200 ft. 

 alt.; Outlet of Yellowstone Lake ; Alum Creek (Forwood). 

 Senecio integerrimus, Nutt. 



Bogs, Pebble Creek, 8200 ft. alt. (a form with solitary heads). Rare. 



Senecio lugens, Richards. 



Very common in bogs from 7500-9000 ft. alt. 



Senecio canus, Hook. 



Common in dry open places up to 8000 ft. alt. 



Senecio aureus, L., var. subnudus, Gray. 



Rather common in grassy bogs. Lakes, head of Gibbon River, 8000 

 ft. alt.; Mirror Lake Plateau, 8800 ft. alt.; Lower Geyser Basin 

 (Coulter). 



Senecio aureus, L., var. croceus, Gray. 

 Yellowstone Lake (Coulter). 



Cnicus Hookerianus, Gray. 



Dry marshes along Soda Butte Creek, 7500 ft. alt. ; Rocky, subalpine 

 ridges of Mt. Morris, 9000 ft. alt. Rare. 



Cnicus Drummondii, Gray. 



Very common in open places up to 8500 ft. alt., from a few inches to 

 several feet in length. 

 4 



