88 



BULLETIN 772, U. S. DEPARTMENT OF AGRICULTURE. 



One of the long-awned species, Agropyron spicatum (Pursh) 

 Scribn. and Smith (A. divergent Nees), called bunch-grass, or more 

 distinctively blue bunch wheat- 

 grass, is of especial value as a 

 forage grass. It is 6ommon in the 

 Columbia Basin, where it is one of 

 the chief range grasses. The spe- 

 cies is distinguished by its erect 

 bunchy habit and by the spread- 

 ing awns of the lemmas, giving 

 the spike a bristly appearance. 



FIG. 43. Quack-grass, Ayropyron repens. Plant, X 1 ; spikelet, X 3 



Two of our species have disarticulating spikes, thus approaching 

 Sitanion. These are Agropyron saxicola (Scribn. and Smith) Piper, 

 of Washington, and A. scribneri Vasey, a spreading mountain species 



