42 FLORA OF THE YELLOWSTONE NATIONAL PARK. 



Galium triflorum, Michx. 



Common in damp places throughout. Mammoth Hot Spr'ngs, 6400 ft. 

 alt. ; Mirror Lake, 8800 ft. alt. 



Galium trifidum, L. 



With the preceding, but rather less frequent. 



Galium boreale, L. 



Moist meadows and borders of woods. Very common from 7500- 

 9000 ft. alt. 



Galium bifolium, Wats. 



Gravelly slides. Soda Butte Creek, near tlie eastern boundary of the 

 Park, 8500 ft. alt. 



VALERIANACEJE. 



Valeriana edulis, Nutt. 



A characteristic bog plant of the region, 6500-9000 ft. alt. 



Valeriana sylvatioa, Banks. 



With the preceding, but often in dryer situations. 



COMPOSITE. 



Liatris punctata, Hook. 



Dry benches near Gardiner, 5400 ft. alt. ; common along the Yellow- 

 stone River beyond the limits of the Park. 



Gutierrezia Euthamise, Torr and Gray. 

 With the preceding. 



Chrysopsis villosa, Nutt. 



A characteristic and common plant of the hot spring and geyser 

 areas. 



Chrysopsis villosa, Nutt., var. hispida, Gray. 



Madison Lake (Coulter); Yellowstone (Parry). 



Aplopappus uniflorus, Torr and Gray. 



Rather common on hot spring and geyser formations ; not observed 

 elsewhere. 



Aplopappus Lyallii, Gray. 



Common on nearly all the alpine slopes and summits from 9500- 

 10,500 ft. alt. 



