408 GRAMINE.E. (GRASS FAMILY.) 



2. S. pennata, L., var. Neo-Mexicana, Thurber. Easily distin- 

 guished by the awns, which are 6 inches or more long, twisted for l to 2 inches 

 below, the upper part flat and beautifully plumose-pennated. Gram. Mex. 

 Bound, ined. Extending into S. W. Colorado from New Mexico and Texas. 



# * Awn not plumose, often strongly pubescent. 

 t- Panicle loose, open. 



3. S. KichardSOnii, Link. Stem l to 2 feet high, slender: panicle 4 to 

 5 inches long, with slender few-flowered branches ; callus short and blunt : outer 

 glumes pointless, nearly equal, about equalling the pubescent flowering glume ; 

 awn 6 to 8 lines long. Mountains of Montana, Scribner, and northward ; 

 Manitoba and north shore of Lake Superior, Macoun ; also in Maine. 



4. S. COmata, Trin. & Rupr. Stems 1 to 4 feet high, stout, mostly scabrous : 

 leaves roughened, the radical 4 or the length of the stem: panicle included 

 at base by the upper sheath, 8 to 12 inches long ; callus pointed: outer glumes 

 nearly equal, with a long subulate point: flowering glume pubescent with coarse 

 hairs: awn 4 to 6 inches long, scabrous especially above, shining, variously 

 curled and twisted. Watson, Bot. King Exped. 380. From the Upper 

 Missouri to California, New Mexico, and Nebraska. 



- -i- Panicle narrow, contracted. 



5. S. Spartea, Trin. Stems 1 to 3 feet high, rather stout : callus pun- 

 gently pointed, villous-bearded (when mature) : glumes lanceolate, slender subu- 

 late-pointed, greenish, longer than the palets which are linear and pubescent 

 below. From Colorado to the Upper Missouri, thence eastward to Illinois 

 and Michigan. 



6. S. viridula, Trin. Stems l to 5 feet high, with numerous withered 

 sheaths at base: panicle 6 to 18 inches long; callus very short: glumes ovate, 

 bristle-pointed, sometimes tinged with purple : lower palet with short scattered 

 hairs which form a rather irregular crown, and with 2 very minute hyaline teeth : 

 awn 1 to l inches long, usually twice bent, pubescent below and scabrous 

 above. Watson, Bot. King Exped. 380. From Colorado to California, 

 Oregon, the Upper Missouri, and British America. 



15. ORYZOPSIS, Michx. MOUNTAIN RICE. 



Perennials, with rigid leaves and a narrow raceme or panicle. Spikelets 

 rather large. 



1. O. micrantha, Thurber. Leaves linear-setaceous, involute : branches 

 of the panicle in pairs, many-flowered ; spikelets shining, florets smooth, a little 

 shorter than the linear acutish glumes : awn about thrice longer than the glumes : 

 anthers naked at apex. Steud. Glum. 122. Colorado and southward. 



2. O. cuspidata, Benth. Stems 1 to 2 feet high, rather rigid and some- 

 \vhat scabrous: leaves narrow, involute, elongated (2 to 18 inches): panicle 

 frequently included at base, dichotomousli/ branched ; the spikelets solitary upon 

 capillary peduncles : outer glumes more or less purple, pubescent, attenuate- 

 rostrate : flowering glumes rigid, densely covered with long white silky hairs : the 

 stout nearly straight awn mostly longer : palet rigid : anthers bearded at apex. 

 Eriocoma cuspidata, Nutt. From the Sierras eastward to Missouri and 

 Texas. 



