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



nearly to apex. Ql — Moist woods, 

 New Jersey to Michigan and Illinois, 

 south to Florida and Texas. 



45. Poa alpina L. Alpine blue- 

 grass. (Fig. 159.) Culms erect from a 

 rather thick vertical 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; spikelets broad, purple 

 or purplish; glumes broad, abruptly 

 acute; lemmas 3 to 4 mm. long, 

 strongly villous on the keel and mar- 

 ginal nerves, pubescent on the inter- 

 nerves below, the intermediate nerves 

 faint. Ql — Mountain meadows, 

 Arctic regions of the Northern Hemi- 

 sphere, extending south to Quebec, 

 northern Michigan (Keweenaw 

 Point), and the alpine summits of 

 Colorado, Utah, Washington, and 

 Oregon (Wallowa Mountains); Mex- 

 ico. 



46. Poa stenantha Trin. (Fig. 160.) 

 Culms tufted, 30 to 50 cm. tall; 



ligule prominent, as much as 5 mm. 

 long; blades flat or loosely involute, 

 rather lax, mostly basal, 1 to 2 mm. 

 wide, the uppermost culm leaf below 

 the middle of the culm; panicle nod- 

 d ng, 5 to 15 cm. long, the branches 

 in twos or threes, arcuate-drooping, 

 naked below, with a few spikelets at 

 the ends; spikelets 3- to 5-flowered, 6 

 to 8 mm. long; lemmas about 5 mm. 

 long, pubescent on the lower part of 

 keel and marginal nerves, sparsely 

 pubescent on the internerves below. 

 % — Moist open ground, Alaska, 

 Alberta, and British Columbia, ex- 

 tending into Montana, Colorado 

 (White River Forest), Idaho, Wash- 

 ington (Nooksack River), and Oregon 

 (Crater Lake). 



Figuhe 160. — Poa stenantha. Panicle, X 1; floret, 

 X 10. (Blankinship, Mont.) 



Figure 161. — A, Poa glauca. Panicle, X 1; floret, 

 X 10. (Hitchcock 16053, N. H.) B, P. glaucantha. 

 Panicle, X 1; floret, X 10. (Butters, Abbe, and 

 Abbe 258, Minn.) 



47. Poa glauca Vahl. (Fig. 161, A.) 

 Plants glaucous, in close or loose 

 tufts; culms compressed, stiff, 10 to 

 30 cm. tall, sometimes taller, naked 

 above, the uppermost leaf usually 

 much below the middle, its ligule 



