GRASS KAMn,\' 10!) 



row, linn ; paiiicK' ;i to (i iiiclics loiifX. Iln' Iiimiic-Iics slender, rather stil'lly asceiiil- 

 iiiK. tlie longer 2 to -i iiielie.s loiip:. bearing spikelets from alxmt. the niiihlle; 

 gliunes (•oni])arati\(')y broad, indistinetlj' ^5 to 5-nerved, smooth, rather 

 abrnpll.v acuminate, i'i(iial. -1 to ."> lines long; lemma elliptical, 21/^ lines long, 

 densely loiig-villous; awn about ',,^> inch long, tardily deeiduoiis, once-geincu- 

 late, the first section alioni :i lines long, slightly twisted, appressed-villous, 

 indistinctly bent or llexuoiis. the second section straight, minutely scabrous. 



Dry I'egioiis, Wasiiington to Manitoba and south to New Mexico. 



ijocs. — Moultiiii, Mo<li)e Co., (liiffillis i)'- Hunter 456; Mt. Dialilo, Bolander; Lancaster, 

 lilmcr 4165. 



Refs. — Oryzopsis hi.oomkki Riclccr; I'ipcr, (,'oiitr. Nat. llorli. 11: 109. 1906. Slipa 

 bloomiri Boland. Proc. ('at. Acad. 4: 16s. l.STi!, type from Mono Pass, Bolander 611(i. S. 

 siberiea | Lam. misapplicfl bvl Tluirb. in Wats. Bot. Cat. 2: 287. 1880. 

 Hi. MUHLENBERGIA Sclireb. 



Spikeb'ls 1 llowercd. (Jinnies thin. 1 iier\ed, often aristate. Lemma with a 

 short, (il'ten barl)ate cidins. nari-ow. m(>ml)raHaceons, l5-nerved, acute, mucroii- 

 ate, or ol'leii awned I'rom tlie tip or rr(nii between tiio teeth of the bidentate 

 ape.x. i'ajea tiiin, aliout as long as b'lnnia. .\nnnal m- usually perennial 

 grasses, the inlloi-(?sceiice varying from an open and diffuse, to a narrow and 

 spike-liki! panicle. — Species about (iO. mostly .\merican. especially abundant 

 on the Mexican plateau. (Rev. Dr. Ibiu-y .Mnhhiiberg. a distinguished Ameri- 

 can botanist, 1753—1815.) 



Hairs at hase of floret at least half .us Imif; as body of lenuna; pauicli' narrow; perennials. 



Hairs at base of floret copious, as long as boity of lemma 1. M . eanidla. 



Hairs at base of floret not over t{> as Ion;; as boily of lemma. 



Panicle loose; upper ji-lunie ii-tontlied; hlailes involute 2. M. riraeiliK. 



Panicle close; ghunes entire; blades Hat. 



Blades narron-, about 1 line wide ?.. M. lemmoni. 



Blades broad, l'/-! to 2i/> lines wide 4. M. californiaa. 



Hair.s at base of floret minute or wanting. 



(Jlumes erosc-toothed ; culms erect; plants perennial, without rliizomes 7. M. jnnrsii. 



Illumes entire; culms mostly decuudieut or spreading; plants penimi.'il with rhizomes, or 

 annual, 

 licmnui awned. the awn :i lines long ur more. 



Plants annual; panicle narrow; awn 5 to 7 lines long 5. M. microupci'mn. 



Plants i)erenni.'il ; ])anicle diffusely spreading; awn :! liiu's long 6. M. porteri. 



Lenuna unawned, nuicronate; panicles narrow. 



Cidnis capill;iry; ])lants lax ami soft, no ciceping rootstoeks, often annual; blades 



flat 8. M. ptiffirmis. 



Culms stouter, r.-itlier woody (jr wiry; rootstoeks creeping; blades involute. 



I'lants widely s])reatling or creeping; glumes ■j'l line long 9. M. repcns. 



Plants erect or decumbent at base; glunn^s lo line long 10. M. squarroaa. 



1. M. comata 'riiurb. i*erenni;il. willi imnierous scaly rhizomes; culms erect 

 or sometimes spre.-nliiig. siiiooth below. sc;dn-ous ;ibo\'e, pubescent about the 

 nodes, 1 ' i; (o •! I'cet liii;h : slie;illis snionth nr slightly scabrous, keeled; ligulc 

 y-2 line long, meiid)ranaceous. short-ciliate ; blades flat, 1 to '■'• lines wide, sca- 

 brous; p;iniclcs narrow, spike-li!<e, usually more or less lobed or interru|>ted, 

 often ]»urple t inged, :; In ti inches long; gluiiK's narrow, acuminate, 1-nerved, 

 smooth, ciliatc-scabrons on the keels, 1 ' •_. to 2 liix's long; lenuna 1'^ lin(!S long, 

 gradually narrowed into ;i cai)ill;iry awn 2 to 4 lines long, the hairs at base of 

 floret copious, 1 to 1 ' -j lines long. 



]\rt. Shasta south through the Sii'i-iM \i'\;id;i to the S;iii In'mardino .Mts. 

 In IIk- inonntains \vi>\\\ Washington to Wyoming and south to Colorado. 



