107 



Fig. 89. Stipa sparteaTrin. Porcupine-grass. A stout, ere( t 

 perennial, with simple culms 6 to 10 dm. high, long, narrow leaver 

 and few-flowered panicles. The strong, twisted awns are 8 to 15 

 cm. long, and at the base of the flowering glume is a long, pointed, 

 and bearded callus. Prairies, Illinois to Colorado, north to Mani- 

 toba and British Columbia. Jnne-Angust. 



