251 



Fig. 547. Poa lettermani Vasey, Coutiib. Nat. Herb. 1 : 273. 

 1893. Letteuman's Blue-gras.s.— A densely tufted, low perennial 

 0.5 to 1 dm. high, with loose sheaths, short, flat leaves and oblong, 

 rather densely-flowered panicles 1 to 2 cm. long. Spikelets 3 to 4 

 mm. long, with rather broad and nearly equal empty glumes (a) 

 exceeding in length the adjacent flowering glumes, which are 2 to 

 3 mm. long, obscurely nerved, obtuse, and glabrous.— Summits of 

 high mountains, Colorado. .July, August. 



