668 GEOGRAPHICAL DISTRIBUTION OF 



" Alopecurus is a Pacific-coast genus, 7 of its 9 species being 

 found in Oregon, while only one other state, Colorado, has more 

 than 3. 



" Andropogon. If we omit those species which have commonly 

 been called Chrysojiogon and Sorghum, we shall still have 33 left,^ 

 and these are largely southern and eastern. Florida leads the list 

 with 25, of which 7 are peculiar to that state. 



" Aristida is well distributed over the entire country, though 

 more abundant in the south and west, A. purpurascens is the 

 common type of the genus, being credited to 31 states. 



" Bouteloua finds its home on the southern plains, 18 of its 22 

 species being found in Texas, and 4 are confined to that state. 



^' Bro7nus, with its 20 species, is found from the Atlantic to the 

 Pacific, though more abundantly in the far "West, 14 species being 

 found in California and 10 in Colorado, against 7 in Xew England, 

 1 in Florida, and 5 in Tennessee. B. secalinus and B. Kahnii are 

 the most widely distributed species, and 10, half the entire number, 

 are immigrants, mostly on the Pacific coast, and the number of 

 these will doubtless be largely increased in the near future. 



"The famous Buclilo'e^ which was formerly sujDposed to cover the 

 entire Western plains with a dense mat of turf, seems now to be 

 confined to eight or ten states, and to be nowhere abundant. 



" Calamagrostis is essentially a Xorthern genus, reaching its 

 greatest development along the slopes of the Rocky Mountains and 

 among the hills of Xew England. New England and Minnesota 

 have 9 each, Oregon 11. 



•' Oonohrus trihuloides makes trouble from Maine to California, 

 and from ^Minnesota to Florida, but is not rej)orted from the ex- 

 treme Northwest. 



" Of the 9 species of Chloris only 1 is found beyond the southern 

 tier of states, and even that does not venture beyond Kansas and 

 Tennessee. 



" Cinna, whether it have 1, 2, 3, or 4 species, as published by 

 different authors, covers nearly the entire country with some of its 

 many forms. 



" Danthonia, with its 7 species, is quite local, 3 species being 



