299 



Fi(i. 595. Agropyron riparium Scriltu. A Smith, U. S. Dept. 

 Agr., Div. Af^ros., IJull. 4 ; 35. 1897. JRivek-sidk WiiKAT-GUAtis. 

 A rather slcuder, tufted, glaucous pereuuial, 4.5 to G dm. higli, 

 with iiariowly nivoluto leavL-s, piilie.scent slieaths, ami densely 

 dowered spiiccs 5 to 8 cm. long. Spiivolcts 5- to T-lloweri'd, 10 to 

 12 mm. long, awaless. Empty glumes (c) less than oue-half as 

 long as the spikelet, Kiver banks, Montana. July, August. 



