NTRODUCTION. 



This second part of the Grasses of the Soiithwest presents, like the first part, 

 plates and descriptions of 50 species of grasses, together makiiag 100. 



The synonymy of such as have had several names is briefly given. Most of 

 the species, however, are either new, or so little known that they have received 

 but a single name. The drawings were made by Messrs. SchoU, Olszewski, and 

 Holm, and in the details are generally very accurate. I wish to expi"ess my obliga- 

 tions to Mr. L. H. Dewey, Assistant Botanist, for important assistance in describing 

 the si)ecies. 



Geo. Vasey. 



August 3, 1891. 



5 



