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



FIGUBE 221. Distribution of 

 Poa interior. 



FIGURE 223. Distribution of 

 Poa fendleriana. 



or 6-flowered, about 8 mm long; glumes broad, 3 mm long; lemmas 4 

 mm long, villous on lower part of keel and marginal nerves, the inter- 

 mediate nerves obscure ; pistillate spikelets with minute stamens, the 

 anthers about 0.2 mm long. 91 Mesas, open dry woods, and rocky 

 hills at medium altitudes, Manitoba to British Columbia, south through 

 western South Dakota (Black Hills) and Idaho to western Texas 

 (Chisos Mountains) and 

 California ; northern 

 Mexico (fig. 223). A 

 very small proportion 

 of specimens have been 

 found with well-devel- 

 oped stamens having 

 large anthers, the pistil 

 also developed. 



41. Poa longiligula Scribn. and Will. LONGTONGUE MUTTON GRASS. 

 (Fig. 224.) Differing from P . fendleriana in the prominent ligule, as 



much as 5 to 7 mm long and 

 in the looser, often longer 

 usually greenish panicle. 21 

 North Dakota to Oregon, 

 south to New Mexico and Cal- 

 ifornia (fig. 225). 



42. Poa autumnalis Muhl. 

 (Fig. 226.) Culms in rather 

 large lax tufts, 30 to 60 cm 

 tall; blades 2 to 3 mm wide, 

 numerous at base; panicle 10 

 to 20 cm long, about as broad, 

 very open, the capillary flex- 

 uous branches spreading, bear- 

 ing a few spikelets near the 

 ends; spikelets 4- to 6-flowered, FIGURE 224. 



FIGURE 222 Poa fendleriana. Panicle, about 6 mm long; lemmas ob- f ? ?? '"v^ 



xi, tee,, x 10. (Eggteston^, Jong, obtusely rounded at the |g ' 



scarious compressed apex, vil- 

 lous on the keel and marginal nerves, pubescent on the internerves 

 below or sometimes nearly to apex. 01 -Moist woods, New Jer- 

 sey to Michigan and Illinois, south to Florida 

 and Texas (fig. 227). 



43. Poa alpina L. ALPINE BLUEGRASS. (Fig. 

 228.) Culms erect from a rather thick ver- 

 tical crown, rather stout, 10 to 30 cm tall; 

 blades short, 2 to 5 mm wide, the uppermost 

 about the middle of the culm; panicle ovoid or 

 short-pyramidal, rather compact, 1 to 8 cm 

 long, the lower branches often reflexed ; spike- 

 lets broad, purple or purplish; glumes broad, abruptly acute; lemmas 

 3 to 4 mm long, strongly villous on the keel and marginal nerves, 

 pubescent on the internerves below, the intermediate nerves faint. 

 Mountain meadows, arctic regions of the Northern Hemi- 

 sphere, extending south to Quebec, northern Michigan (Keweenaw 

 -Point), and the alpine summits of Colorado, Utah, and Oregon 

 (Wallowa Mountains); Mexico (fig. 229). 



FIGURE 225. Distribution of 

 Poo longiligula. 



