136 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



rather stiff; panicle narrow, 10 to 15 

 cm. long, pale, rather loose, the 

 branches short-appressed ; spikelets 3- 

 to 5-flowered, 6 to 8 mm. long; glumes 

 narrow, the second about as long as 

 the lowest floret; lemmas 4 to 5 mm. 

 long, rather obtuse at the scarious tip. 

 % — Low meadows and wet places, 

 Montana to eastern Washington and 

 Yukon Territory, south to Colorado, 

 Arizona, and the Sierras and San 

 Bernardino Mountains, California; on 

 wool waste in Maine (North Ber- 

 wick). 



Figuee 176. — Poa gracillima. Plant, XI; floret, X 10. 

 (Sandberg and Leiberg 747, Wash.) 



7. Nevadenses. — Perennials, without 

 rhizomes, tufted; spikelets little 

 compressed, narrow, much longer 

 than wide ; lemmas convex on the 

 back, glabrous or minutely sca- 

 brous, not crisp-puberulent ; keels 

 obscure, marginal and intermedi- 

 ate nerves usually faint. 

 66. Poa nevadensis Vasey ex 

 Scribn. Nevada bluegrass. (Fig. 

 179.) Culms erect, 50 to 100 cm. tall; 

 sheaths scabrous, sometimes only 

 slightly so; ligule about 4 mm. long, 

 shorter on the innovations, decur- 

 rent; blades usually elongate, narrow, 

 involute, sometimes almost capillary, 



Figure 177. — Poa secunda. Plant, 

 X 1; floret, X 10. (Hitchcock 

 23202, Wyo.) 



Figure 178. — Poa can- 

 byi. Panicle, X 1 ; 

 floret, X 10. (Williams 

 2787, Wyo.) 



