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



branches erect or ascending, few-flowered; spikelets mostly 2- or 3- 

 flowered, 5 to 6 mm long; lemmas 3 to 4 mm long, strongly pubescent 

 on the lower half of the keel and marginal nerves and slightly pubes- 

 cent on the faint intermediate nerves. 91 Rocky slopes, arctic 



regions south to the alpine summits of New 

 Hampshire and Vermont. Common in 

 Greenland. 



46. Poa laxa Haenke. (Fig. 233.) 

 Plants in loose lax bunches; culms weak 

 and slender, 10 to 20 or sometimes 30 

 cm tall; ligule truncate, about 1 mm long; 

 blades mostly basal, lax, mostly about 1 

 mm wide; panicle narrow but loose, few- 

 flowered, 2 to 6 cm 

 long, the branches 

 ascending, naked 

 below; spikelets 2- 

 to 4-flowered, about 

 5 mm long ; lemmas 

 3 to 3.5 mm long, 

 densely villous on 

 the lower half of the 



keel and marginal nerves, sometimes 

 sparsely webbed at base. 91 Rocky 

 slopes, Newfoundland and Quebec to the 

 alpine summits of Maine, New Hampshire, 

 Vermont, and New York (fig. 234) ; Europe. 

 Common on the upper cone of Mount 



FIGURE 230. Poa stenantha. Panicle, Washington. 



Mont fl ) ret ' X1 ' (Blankinship ' 47. Poa pattersom Vasey. PATTERSON 



BLUEGRASS. (Fig. 235.) Culms in dense 



tufts with numerous basal leaves, 10 to 20 cm tall; blades usually 

 folded, rather lax, mostly less than 10 cm long, about 1 mm wide; 



FIGUBE 231. Distribution of 

 Poa stenantha. 



FIGURE 232. Poa glauca. 

 Panicle, X 1; floret, X 10. 

 (Hitchcock 16053, N.H.) 



FIGURE 233. Poa 

 laxa. Panicle, X 1; 

 floret, X 10. (Fer- 

 nald, Maine.) 



FIGURE 234. Distribution of 

 Poa laxa. 



panicle narrow, condensed, purplish, 1 to 4 cm long; spikelets 2- 

 or 3-flowered, 5 to 6 mm long; lemmas about 4 mm long, strongly 

 pubescent on the keel and marginal nerves, short-pubescent on the 

 internerves, sometimes sparsely webbed at base. 91 Alpine 



