MANUAL OF THE GRASSES OF THE UNITED STATES 



135 



FIGURE 256. Distribution of 

 Poa secunda. 



rather prominent; blades rather short, soft, flat, folded, or involute; 

 panicle narrow, 2 to 10 cm long, the branches short, appressed, or 

 somewhat spreading in an thesis; spikelets about as in P. gracillima. 

 OJ. (P. sandbergii Vasey.) Plains, dry woods, rocky slopes, at me- 

 dium and upper altitudes, but not strictly alpine, North Dakota to 

 Yukon Territory, south to Nebraska, New Mexico, Utah, Nevada, 

 and southern California; Chile (fig. 256). 



60. Poa canbyi (Scribn.) Piper. CANBY BLUEGRASS. (Fig. 257.) 

 Green or glaucous; culms 50 to 120 cm tall; ligule 2 to 5 mm long; 

 blades flat or folded; panicle narrow, compact or rather loose, 10 to 



15 cm long, sometimes as 

 much as 20 cm, the branches 

 short, appressed; spikelets 

 3- to 5-flowered; lemmas 

 more or less crisp-pubescent 

 on lower part of back. 01 

 (P. lucida Vasey; P. laevi- 

 gata Scribn.) Sandy or dry 

 ground, Michigan (Isle 

 Koyal) and Minnesota to 

 Yukon Territory, south to 

 western Nebraska, Colo- 

 rado, Arizona, eastern Ore- 

 gon, and eastern Washing- 

 ton; Quebec (fig. 258). Poa 

 lucida has a slender but 

 somewhat loose pale or shin- 

 ing panicle; P. canbyi has 

 a denser, compact, dull 

 green panicle, but the two 

 forms grade into each other. 

 Poa lucida is more common 

 in Colorado and Wyoming; 

 P. canbyi more common in 

 FIGURE 255. Poa setunaa. Montana. The pubescence 

 Plant, x i; floret, x io. on the lemma may be obvi- 



(Hitchcock 23202, Wyo.) oug or obscpre . 



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 intermediate nerves usu- 

 ally faint. 



61. Poa nevadensis Vasey. NEVADA BLUEGRASS. (Fig. 259.) 

 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, 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. 01 Low 



FIGURE 257. Poa canbyi. 

 Panicle, X 1; floret X 10. 

 (Williams 2787, Wyo.) 



FIGURE 258. Distribution of 

 Poa canbyi. 



