MANUAL OF THE GRASSES OF THE UNITED STATES 



115 



Figure 187.— Distribution of 

 Poa glaucifolia. 



20. Poa glaucifolia Scribn. and Will. (Fig. 186.) Plants glau- 

 cous; culms in loose tufts, 60 to 100 cm tall; blades 2 to 3 mm wide; 

 panicle narrow, open, mostly 10 to 

 20 cm long, the branches usually in 

 somewhat distant whorls, mostly 

 in threes, ascending, very scabrous, 

 naked below; spikelets 2- to 4- 

 flowered; glumes 4 to 5 mm long; 

 lemmas about 4 mm long, villous 

 on the lower half of the keel and 

 marginal nerves and more or less 

 so on the intermediate nerves below. 

 % — Moist places, ditches, and 

 open woods at medium altitudes, 

 British Columbia and Alberta 

 through 

 Montana to 

 Nebraska, 

 New Mex- 

 ico, Arizona, 

 and Nevada 

 (fig. 187). 



21. Poa 

 arctica R. 

 Br. Arctic bluegrass. (Fig. 1£ 



from a decumbent base, 10 to 30 cm talljligule pointed, up to 4 mm 



long; blades mostly basal, flat or 

 folded, mostly 2 to 3 mm wide, one 

 short blade about the middle of the 

 culm; panicle open, pyramidal, 5 to 

 1 cm long, the lower branches usually 

 2, spreading, sometimes reflexed, 

 bearing a few spikelets toward the 

 tip; spikelets 5 to 8 mm long, 3- or 

 4-flowered; lemmas densely villous 

 on the keel and marginal nerves and 

 pubescent on the lower part of the 

 internerves, 

 the base often 

 webbed. % 

 (P. grayana 

 Vasey; P. 

 aperta Sciibn. 

 and Merr., a 

 form with 

 pale, rather 



lax panicles longer than wide.) — Meadows, mostly above timber line, 

 arctic regions, south to Nova Scotia, in the Rocky Mountains to 

 northern New Mexico, and in the Cascades to Oregon (fig. 189). 



Figure 186.— Poa glaucifolia. Panicle, X 1; floret, 

 X 10. (Rydberg 3288, Mont.) 



>.) Culms loosely tufted, erect 



Figure 188.— Poa arctica 

 X 10. (Bell 64 



Panicle, X 1; floret. 

 Hudson Bay.) 



Figure 189 — Distribution of 

 Poa arctica. 



