244 



Fig. 540. Poa occidentalis Yasey, Contr. Nat. Herb. 1 : 274. 

 1893. Western Blue-grass. — A slender or somewhat stout, leafy 

 perennial 5 to 8 dm. high, with open, loosely flowered panicles 15 to 

 30 cm. long. Spikelets 4 to 6 mm. long, mostly 3-flowered. with 

 acute empty glumes and obtuse floral glumes, which are 3 to 4 

 mm. long and slightly pubescent on the keel below, with a distinct 

 tuft of cobwebby hairs at the base. — In moist soil. Xew Mexico 

 northward to Colorado and Wyoming; also (?) Alaska. June- 

 September. 



