Piper : Agropyron tenerum and its allies 



547 



well to distinguish the species. The material from the Rocky 

 Mountains at rather high elevations is, however, especially puzzling, 

 apparently completely connecting the two species. 



We would refer A. brtvifoliinn Scribn. to A. biflorum. 

 The two subspecies of A, biflorinn described by Scribner & 

 Smith are readily distinguishable, and perhaps worthy of specific 



rank. They are Agropyron biflorum latiglume {A, violacaim 

 ladghane Scribn. & Smith, U. S. Dept. Agr. Div. Agrost Bull. 

 4: 30. 1897) w^ith the flowering glumes short-pubescent, and 



Agropyron biflorum andinum {A. violacenm andinmn Scribn. & 



Smith, loc, cit!) with the flowering glumes long-awned. 



Bureau of Plant Industry, 



United States Department of Agriculture. 



