70 FLORA OF THE YELLOWSTONE NATIONAL PARK. 



Oryzopsis cuspidata, Benth. 



Sparingly over the lower and dryer open areas. 



Muhlenbergia comata, Benth. 



Upper Geyser Basin (Coulter). 



Phleum alpinum, L. 



Bogs and meadows, very common from 8000-9000 ft. alt. (649). 



Sporobolus depauperatus, Scribn. (Vilfa depauperata, Torr.). 

 Yellowstone Lake (590); Upper Geyser Basin (Coulter). 



Sporobolus asperifolius, Thurb. 



Frequent in arid situations at low altitudes. 



Agrostis varians, Trin. 



Common in moist places, up to 9000 ft. alt. (605). 



Agrostis scabra, Willd. 



Dry meadows and open slopes. Very common, up to 8000 ft. alt. 

 (258, 606, 607, 608). 



Agrostis exarata, Trin., var. 



Pelican Creek, 8000 ft. alt. ; Wooded bogs ancl along streams. Not 

 common (604). 



Agrostis humilis, Vasey. 



Common in cool mossy bogs and mountain meadows, 7000-9030 ft. 

 alt. (259, 603). 



Agrostis perennans, Tuck. 



Lower Geyser Basin (Coulter) ; Upper Falls of the Yellowstone 

 (Adams). 



Cinna pendula, Trin. (C. arundinacea, L., var. pendula, Gray). 



Wooded bogs and streams. East Fork, 8600 ft. alt.. Rare (581). 



Deyeuxia Langsdorffii, Kunth. 



Common in wooded and open mountain meadows an 1 bogs, 7000-9000 

 ft. alt. (248), 



Deyeuxia Canadensis, TTook. 

 With the preceding (584). 



Deyeuxia dubia, Scribn., n. sp. 



Meadows, Slough Creek, 6700 ft. alt. (58o). 



Deyeuxia sylvatica, DC. 



Upper Yellowstone Falls (Adams). 



