299 



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

 Agr.,Div. Agros., Bull.4 ; 35. 1897. Eiver-side Wheat-gkass.— 

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

 with narrowly involute leaves, pubescent sheaths, and densely 

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

 12 mm. long, awnless. Empty glumes (a) less than oue-half as 

 long as the spikelet. — Elver banks, Montana. Julj^, August. 



