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



Figure 260.— Distribution of 

 Poa nevadensis. 



meadows and wet places, Montana to eastern Washington and Yukon 

 Territory, south to Colorado and the Sierras and 

 San Bernardino Mountains, California; on wool 

 waste in Maine (North Berwick) (fig. 260). 



62. Poa curtifolia Scribn. (Fig. 261.) Culms 

 several in a tuft from firm branched crowns, 10 to 

 20 cm tall; ligule prominent, the uppermost as 

 much as 5 mm long; blades short, the lower 1.5 

 to 2 cm long, 2 to 3 mm wide, 

 the upper successively smaller, 

 the uppermost near the panicle, 

 much reduced; panicle narrow, 

 3 to 6 cm long; spikelets about 

 3-flowered ; glumes equal, 5 mm 

 long, the first acuminate, the 

 second broad, rather obtuse; 

 lemmas 5 to 5.5 mm long. 

 % —Known only from central Washington. 



63. Poa juncifolia Scribn. Alkali bluegrass. 

 (Fig. 262.) Pale; culms erect, 50 to 100 cm tall; ligules 

 short, those of the innovations not visible from the 

 sides; blades involute, smooth, rather stiff; panicle 

 narrow, 10 to 20 cm long, the branches appressed; 

 spikelets 3- to 6-flowered, 7 to 10 mm long; glumes 

 about equal; lemmas about 4 mm 

 long. Ql (P. brachyglossa Piper.) 

 — Alkaline meadows, Montana to 

 British Columbia, south to Colorado 

 and east of the Cascades to north- 

 eastern California (fig. 263). 



64. Poa ampla Merr. Big blue- 

 grass. (Fig. 264.) Green or glau- 

 cous; culms 80 to 120 cm tall; 

 sheaths smooth, rarely scaberulous ; 

 ligule short, rounded; blades 1 to 3 

 mm wide; panicle narrow, 10 to 15 

 cm long, usually rather dense; 

 spikelets 4- to 7 -flowered, 8 to 10 

 mm long; lemmas 4 to 6 mm long. 

 % — Meadows and moist open 

 ground or dry or rocky slopes, 

 Montana to Yukon Territory, south 

 to New Mexico, Arizona, and Cal- 

 ifornia (fig. 265). The typical form 

 is robust and more or less glaucous ; 

 this grades into a smaller green 

 form, more common in the eastern 

 part of the range (P. confusa Rydb.). 



Occasional specimens of the typical form have short rhizomes. 



IIM 



Figure 259.— Poa 

 nevadensis. Panicle, 

 X 1; floret, X 10. 

 (Parish Bros. 1543, 

 Calif.) 



Figure 261. — Poa curti, 

 folia. Panicle, X 1 ; floret, 

 X 10. (Dupl. type.) 



