299 



Fig. 595. Agropyron riparium Scribn. & Smith, U. S. Dept. 

 Agr.,Div. Agros., Bull. 4: 35. 1897. River-side Wheat-grass.— 

 A rather slender, tufted, glaucous perennial, 4.5 to 6 dm. high, 

 with narrowly involute leaves, pubescent sheaths, and densely 

 flowered spikes 5 to 8 cm. long. Spikelets 5- to 7-flowered, 10 to 

 12 mm. loug, awnless. Empty glumes (a) less than one-half as 

 long as the spikelet, — River banks, Montana. July, August. 



