208 



POACEAE 



29. Poa ampla Merr. 

 Merrill's Bluearass. Fig-. 481. 



Poa ampla Merr. Rhodora 4: 14 5. 1902. 

 Poa !aez-icu!mis Williams, Bot. Gaz. 36: 55. 



1903. 



Perennial ; culm,s tufted, erect, smooth, 80-120 cm. 

 tall; sheaths smooth; ligule short and rounded; 

 blades flat, 1-3 mm. long; panicle narrow, 10-15 cm. 

 long, the branches appressed ; spikelets 4-7 -flowered ; 

 lemmas rounded on the back, smooth or minutely 

 scabrous, 4-5 nun. long. 



Meadows and moist open ground, in the Arid Transition 

 Zone; British Columbia to Oregon and Idaho. May -July. 

 Type locality: Steptoe, Washington. 



30. Poa brachyglossa Piper. 



Alkali Bluegrass. 



Fig. 482. 



Poa brachyglossa Piper, Proc. Biol. Soc. Washington 18: 145. 

 1905. 



Perennial; culms tufted, erect, smooth, 50-100 cm. 

 tall ; sheaths smooth ; ligules of the innovations very 

 short, of the culm leaves 1-2 mm. long; blades rather 

 stiff, folded or involute, 5-20 cm. long ; panicle nar- 

 row, 10-20 cm. long, the branches ascending or ap- 

 pressed ; spikelets 7-10 mm. long, 3-6-flowered ; 

 glumes 4-5 mm. long ; lemmas rounded on the back, 

 4 mm. long. 



Alkaline meadows, in the Arid Transition and Upper So- 

 noran Zones; eastern Washington to eastern California (Mount 

 Lola. Di.xie Valley), east to Idaho and Nevada. June-July. 

 Type locality: Douglas County, Washington. 



31. Poa curtifolia Scribn. 

 Little Mountain Bluegrass. Fig. 483. 



Poa curtifolia Scribn. U. S. Dept. Agr. Div. Agrost. Circ. 16: 

 3. 1899. 



Perennial ; culms several in a tuft from firm 

 branched caudices, 10-20 cm. tall ; sheaths smooth ; 

 ligule long, the uppermost as much as 5 mm. long; 

 blades short and broad, flat, spreading, those of the 

 lower culm 1.5-2 ciu. long, about 2 mm. wide, those of 

 tlie innovations narrower; panicle narrow, rather 

 loose, short-exserted, mostly green, 3-6 cm. long; 

 spikelets about 3-flowere.d ; glumes equal, smooth and 

 shining, 5 mm. long; lemmas smooth, about 5 mm. 

 long. 



Rocky slopes, in the Arctic Zone; Washington (Mount 

 .Stuart, Elmer; Yakima region, Tweedy). August. Type local- 

 ity: Mount Stuart. A little-known species which may prove to 

 l)e the same as the next. 



