AOHOSTIDK.E, ^2-^7 



the second n'aoliiiifr neiirly to tlu; base of the ])aTii('lo, third 12-lS 

 cm. loii^x. sometimes exteiidin«j; beyond the puniele. I'aniele bill 

 little exsorted, open, lO-:.'0 cm. lonjr, rays in twos or threes, the 

 half whorls o-i cm. distant, llower-bearing alon;; the iijtper thii'd. 

 Kmpty j,dumes dull <;reen, tinged with {)iir])le, e(iiial, or the llrst a 

 little lonjier, elliptical-lanceolate when the apex is s])reail, stronirly 

 3-nerved, tJ-T mm. long; floret narrowly elliptical. "> mm. long 

 from the short scarcely acute callus to tlie joint of the awn. clothed 

 with prominent white silky hairs over 1 mm. long; awn slightly 

 twisted and bent, about ii cm. long, caducous. 



California. IhtUnulvr (JlKi. seen by Scribner. 



•Montana. Scvilnivr in ISSIj. 



T). 0. Mongolica (Turcz.) Heal, I'oult. Hot. <Jaz. 15: 111 (IS'.Mt). 

 Sfijm MoiKjiilira Turcz. Trin. liull. Soc. Acad. St. I'etersb. 1 : (i? 



(is;5i;). 



A slender erect grass, about 30 cm. high. Sheaths shorter than 

 the internodes; ligule 2 mm. long; l)lades rigid, very slendei'. in- 

 volute, ',1 in number, those of the sterile shoots half as long as tiie 

 ]>laiit, those of the culm 3-5 cm. long. Panicle ex.serted. loose, fcw- 

 tlowered. 4-8 cm. long, the lower rays in twos or threes. Knipty 

 glumes membranous, subequal, ])ur])lish, obtuse^ 5-(') mm. long, 

 lirst 3-nerved, second 3-5-nerved ; lloral glume slightly hairy, about 

 •1.5 mm. long including the short almost obtuse callus, and the 2- 

 toothed apex; awn irregularly bent and plumose throughout, the 

 longest hairs below and nearly 'I mm. long; palea as long as its 

 glume or longer. Stamens 3. 



Mountains of Colorado, lf(tU and Ilarhour (i4(i. 



0. 0. exigua Thurb. Wilkes Expd. 481 (1854). 



Culms very slender. 15-30 cm. high. Ligule not ciliate. about 

 3 mm. long; blades scubrid, those of the culm l-(j cm. long, those 

 below G-15 cm. long, all of them conduplicate and cylindrical, 

 threadlike. Panicle exserted, very simple and narrow, 2-5 cm. 

 long, containing 4-8 spikelets. Spikelets linear-oldong. about 5 

 mm. long, the awn rather stout, curved when mature, and some- 

 what persistent, nearly as long as the spikelet, empty glumes sub- 

 equal, oval, a little shorter than the floret, acute or irregularly 



