'J18 POACK.E. 



tilt! <,f|niii('. ciipillai'v iiwM 1".' IS cm. loiifj;. t.li(f huso abruptly 

 j)()iiil(Ml. Anthers linear. I mm. l<tM.i;'. apex iieneil-tut'ted. 



Mexico, I'riiKjIi' I'.'Sl; also in WCstern Sontli America. 



Cool le(l,i;(!S. 



it. S. setigera I'resl, lleli(|. ila'tik. 1 : '.»•.'() (is:;()). 



A rather stout and ol'teii scahrid yrass. .'5()~!)(i em. hi<,di; (Uilms 

 often pubescent at. the nodes. Slieal lis hairy ut the throat, thelowei- 

 shortor than the intenioih's; liyuk! truncate. )l mm. ion^s lilades ot" 

 sterile shoots mostly involute, one-tiurd as hi<fii as the (Milms. those 

 on the culm -2 15 in numl)er, often Mat. l-C) mm. wide, tlie upper 

 oiu) ir)-;{() em. Ion;;-. ranieU' mostly inchidetl at the l»ase by the 

 lo()S(! sheath, tlexuose, sonu'what one-sided. r^-llOcm. lon<,'. the rays 

 slender in pairs. Kmj)ty flumes suhecpial or the upper sliorter. 

 lonj^-acuminate, ^{-iierved. second j,dum(( sometimes witli several 

 liner intermediate nerves. 1(J-;.M) mm. 1<mi^; l]or(>t 10 mm. loii<r. 

 silky hairy on the nerves, the callus curved iind sharj), u crown of 

 hail's at the apex, awn tfcuicidate. above tlm middh* bent auaiu. 

 twisted and pubescent below. (>-I(i cm. lon<j^. Anthers bearded at 

 the u]H>x. A comnio'i iiuncli-^rrass i»n the dry hills. 



(Jalil'oruia. /'ri. n/r -fours: also in Kansas. 



Kansas, Ti'.xas. >. -w Mexico. I'tali, Californiii and Orejjjou. 



10. S. avenacea L. Sp. IM. IS (17r»;5). I^i.ack Oat-kkass. ,s'. 

 hnrh(if(t Michx. V\. Mor. Am. 1 : .');{ (iS();{). S. I'irf/iiiin/ IVrs. 

 Syn. 1:!»!) (IS05). .S'. hirnhr I'ursh. Kl. Am. Sept. 7:\ (1H14). 



(hilms slender, 40 !>() em. hi^di. Sheatlis half as loni; as the 

 interiuxles; blades liliform, the larf^esl when spread scarcely 2 mm. 

 wide, those of the sterile shoots about half as lon<^ as the culm, 

 those on the culm l{ in luimber, the u[)per 4 7 cm. \o\\<i. rauicle 

 much exserted, open, \)i-ZO cm. lon^; rays very slemler, mostly 

 in twos, the larfj^est <» cm. lonj;. including.,' the two braiudu's, each 

 2-3 (!in. lon^f, bearinj; a sin^de llower. Empty fjjlumes whitish. 

 sid)e(puil, liiu'ar-hineeolate. .'i-nerved. lO-DJ mm. lonjj; lloret 

 brown, scahrid, 9-10 mm. lonj;, indudinj,' tlie sharp curved callus, 

 the Ji{)ex bearinj; a short crown of luiirs, and an awn 4-0 cm. lonjj^, 

 once or twice bent above the middle. 



