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



Figure 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. 01 — 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. % 

 — 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 .— 

 about 6 mm long; lemmas ob- i™ l ™t g xl 

 long, obtusely rounded at the g t °j^ s ' 5149, 

 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. 

 01 — 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 222.— Poa fendleriana. Panicle, 

 X 1; floret, X 10. (Eggleston 6463, 

 N.Mex.) 



Figure 22.5.— Distribution of 

 Poa longiligula. 



