317 



Fig. 613. Elymus robustus Scribu. &. Bmitb. U. S. Dept. Agr., 

 Div. Agios. Bull. 4 : 37. 1897. Gkeat Lyme-grass.— A stout, 

 leafy peieuuial 9 to 18 dm. high, with thick, terminal, long-bearded 

 spikes 10 to 14 cm. long. Spikelets 3- to 4-tiowered, with linear- 

 subulate empty glumes and scabrous or pubescent flowering 

 glumes. Awns spreading 3 to 4 cm. long. — Rich moist soil, Illinois, 

 and Montana to Kansas and New Mexico. June-September. 



