MANUAL OF THE GRASSES OF THE UNITED STATES 



127 



keel and marginal nerves, the inter- 

 mediate nerves obscure; pistillate 

 spikelets with minute stamens, the 

 anthers about 0.2 mm. long. % — 

 Mesas, open dry woods, and rocky 

 hills at medium altitudes, Manitoba 

 to British Columbia, south through 

 western South Dakota (Black Hills), 

 Nebraska, and Idaho to western 

 Texas (Chisos Mountains) and Cali- 

 fornia; northern Mexico. A very 

 small proportion of specimens have 

 been found with well-developed sta- 

 mens having large anthers, the pistil 

 also developed. 



43. Poa longiligula Scribn. and 



Will. LONGTONGUE MUTTON GRASS. 



(Fig. 157.) Differing from P. fendleri- 

 ana in the prominent ligule, as much 

 as 5 to 7 mm. long and in the looser, 

 often longer, usually greenish pani- 

 cle. % — North Dakota to Oregon, 

 south to New Mexico and California. 



Figure 158. — Poa autumnalis. Panicle, X 1; floret, 

 X 10. (Curtiss 6787, Ga.) 



Figure 157. 



-Poa longiligula. Ligule, 

 5149, Utah.) 



X 1. (Jones 



44. Poa autumnalis Muhl. ex Ell. 

 (Fig. 158.) 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 flexuous 

 branches spreading, bearing a few 

 spikelets near the ends ; spikelets 4- to 

 6-flowered, about 6 mm. long; lemmas 

 oblong, obtusely rounded at the scari- 

 ous compressed apex, villous on the 

 keel and marginal nerves, pubescent 

 on the internerves below or sometimes 



Figure 159. 



-Poa alpina. Panicle, X 1; floret, X 10. 

 (Eggleston 11824, Colo.) 



