G 



genus. To be sure there are species so closely connecting FJymm with 

 Sitanion that it is ditticult to determine to which genus they ought to 

 be referred, but the same is true in the case of Elymns and A(iyopyron; 

 there are intermediates which may with equal propriety be placed 

 either in the oue genus or the other. 



That there are forms connecting Sitanion with Elijmus indicates their 

 close relationship, but this fact does not afford suflBcieiit reason for 

 uniting them, and the paper here presented, describing the many 

 species into which Sitanion may be divided, affords good evidence and 

 ample justification for its separation. 



F. LaMSON SCRIB>EK. 



