No. 72. 

 POA ARGENTEA Howell, Bull. Torr. (nub, xv. 11 (1888). 



Plant perennial, cespitose, having numerous sterile shoots ami :i stoloniferous 

 rootstock. 



GulmH erect, or slightly decumbent at the base, smooth, naked above, G to 10 inches 

 tall. 



IjcarrK of sterile shoots with loose, scarions sheaths and narrow, loosely involute, 

 erect blades 3 to 4 inches long: leaves of the culm 2 or .'?; sheaths striate, sniootli, 

 loose, open at the throat, exceeding the short lower internctdcs; blades flat or folded, 

 blnnt-i>ointed, 1 inch long or less; ligule 1 to 2 lines long, decurrent. 



I nllorvHcence a rather closely flowered, ol)long panicle 1 to 2 inches long; ray^ 

 solitary or in twos at the 5 or tJ nodes, erect or slightly spreading, unequal, f inch 

 long or less, si)ikelet-bearing near the extremities. 



Spikeh'ts lance-oblong, 3 to o.J lines long, 2- or 3 flowered with a rudiment; empty 

 glumes oblong, obtuse, thin, sniootli, the first 1 iicivcd, about 2 lines long, tin; second 

 3-nerved at the base and slightly longer than the first, l>ut neither equaling the lower 

 florets; floral glume oblong, ero.sely dentate at the thin, membranaceous, truncate 

 apex, smooth, .5 nerved, 2 to 2i lines long; palet oblong, cniargiuate, nearly as long 

 as the glume; stamens '■>, slightly exserted; internode of rachilla smooth, less than A 

 line long. 



Plate LXXII; a, sinkelet; h, floret with glume and palet spread. 



Oregon, growing in dense tufts, in shaded but rather dry places in the mountains, 

 at an altitude of .'),00(( or 6,000 feet. The membranaceous glumes give the panicle a 

 silvery appearance. 



7. Tt-i»NJc. Scfii, 



