MANUAL OF THE GRASSES OF THE UNITED STATES 115 



Figure 187.— Distribution of 

 Poa gtaucifolia. 



Figure 186—Poaglaucifolia. Panicle, X 1; floret, 

 X 10. (Rydberg 3288, Mont.) 



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 



t h r o u g h 

 Montana to 

 Nebraska, 

 New Mex- 

 ico, Arizona, 

 and Nevada 

 (fig. 187). 



21. Poa 

 arctica R. 



Br. Arctic bluegrass. (Fig. 188.) Culms loosely tufted, erect 

 from a decumbent base, 10 to 30 cm tall;ligule 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. 21 

 (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 188.— Poa arctica 



X 10. (Bell 64, Hudson Bay.) 



Panicle, X 1; floret. 



Figure 189.— Distribution of 

 Poo arctica. 



