igo Wyoming Experunent Station. 



Setaria viridis, Beauv. Agrost. 51 (1812). Chamceraphis viridis, (L.) 

 Porter. 



A troublesome weed in cultivated ground. 



Wheatland, August 11, 1891. Meadow Fox-tail. 

 Cenchrus tribuloides, L. Sp. PL 1050 (1753). 



Common on the sandy plains of the Platte. 



Fort Laramie, September 5, 1892, B. C. Buffum. Sand Bur. 

 Phalaris arundinacea, L. Sp PI. i, 55 (1753). 



Collected in 1891 ; no other data. 



HierocMoa borealis, R. & S. 



Not frequent; Bald Mountain, August 15, 1892. 



Aristida purpurea, Nutt. Trans. Am. Phil. Soc. (II.) v, 145 (1833-37). 

 h.. fasciculata, Torr. 



Whether specimens are typical or belong to one of the varieties 

 of this species I am unable to say. This form is common in the 

 state. 



Wheatland, July, 1891 ; Whalen Canon, July 19, 1894 (No. 539). 



Stipa comata, Trin. and Rupr. Mem. Acad. St. Petersb. (\T) v, 75 

 (1842). 



Frequent on the plains and in dry valleys ; when mature an 

 annoying and worthless grass. 



Laramie, June 17, 1891 ; June 28, 1894 (No. 284). 



Stipa spartea, Trin. Mem. Acad. St. Petersb. ser. 6, i, 82 (1829). 

 On the plains of the eastern part of the state, 1891. 



Stipa viridula, Trin. Mem. Acad. St. Petersb. ser. 6, v, 39 (1836). 



Big Sandy, Fremont county, July, 1892. 

 Oryzopsis exigua, Thurb. Bot. Wilkes Exp. 481. 



Hitherto, it seems, reported only from Oregon and Washington. 



Big Sandy, in the Wind River Mountains, July 22, 1892, B. C. 

 Buffum. 

 Oryzopsis menbranacea, Vasey, Grasses S. W. part 2, t. 10 (1891). 



Very abundant on the plains and in the foothills. 



University Campus, September 16, 1894 (No. 1137); noted in 

 many other places. Mountain Rice. 

 Muhlenbergia comata, Benth. Vasey's Cat. Grasses U. S. 39 (1885). 



Spring Creek, Big Horn Mountains, August 5, 1892. 



