738 GRAMINE.E STIPA 



ORYZOPSIS 



In the mountains, Washington to California. 



S. viridula Trin. Bull. Sc. Acad. St. Petersb. i, 67. Stems l>-5 feet 

 high, with numerous withered sheaths at base : sheaths half as long as the 

 internodes or less : ligules very short: leaves all involute-setaceous at the 

 apex, smooth or slightly scabrous, pale green, the lower )^ as long as the 

 stem : panicle 6-18 inches long, narrow, loose, the short erect branches in 

 twos or threes : spikelets 4-5 lines long, on short pedicels : empty glumes 

 nearly equal, ovate, bristle-pointed, the lower 5-nerved, the upper 3-nerved; 

 flowering glume about % shorter than the empty ones, with short scattered 

 hairs which form an irregular crown, and with 2 very minute hyaline 

 teeth, the callus very short : awn 1-1/4 inches long, slender, flexuous, 

 usually twice bent, pubescent below, scabrous above at length deciduous : 

 palet more than half as long as the glume. California to Brit. Columbia 

 and Nebraska. 



S. minor Scribn. 1. c. 11, 46. Densely cespitose : stems 16-24 inches 

 high, smooth or very minutely pubescent below the nodes: sheaths 

 smooth : ligules very short, slightly auricled, broader than the base of the 

 leaves : leaves 5-15 inches long, 1-2 lines wide, with very long attenuate- 

 involute tips : empty glumes lanceolate, sharply acuminate-pointed, 3-nerv- 

 ed near the base, the lower slightly broader and longer than the upper 

 and less distinctly nerved: flowering glume, including the short callus, 2 

 lines long, thinly pilose all over and with a crown of hairs at the distinctly 

 2-toothed apex : awn once or twice bent, about 10 lines long, very minute- 

 ly scabrous: palet about % as long as the glume. Moist mountain sides, 

 Idaho to Montana and Colorado. 



$. Lemmoni Scribn, U. S. Dept. Agr. Div. Agrost. Circ. 30, 3. Stems 

 slender, rigid, erect, 1-2 feet high, glabrous : sheaths glabrous, shorter 

 than the internodes: ligules less than a line long, rounded, entire, leaves 

 2-5 inches long, 1-2 lines wide, glabrous beneath, pubescent and strongly 

 striate above, closely involute when dry : panicle 5-6 inches long, strict, 

 its branches erect, 1-1 % inches long, few-flowered : empty glumes nearly 

 equal, about 6 lines long, broadly lanceolate, long acuminate-pointed, 3-5- 

 nerved, scarious except the nerves : flowering glume oblong, about 6 lines 

 long, obtuse, 2-toothed at the apex, thinly pilose all over with appressed 

 hairs : palet hairy, nearly as long as the glume. Dry rocky slopes, eastern 

 Washington to California. 



22 ORYZOPSIS Michx. Fl. i, 51. 



Usually tufted grasses with flat or convolute leaves and panicled 

 inflorescence, Spikelets broad, one flowered. Glumes 3, the 2 

 lower ones about equal, obtuse or acuminate, the third shorter or 

 a little longer, broad, bearing a terminal awn which is early decid- 

 uous. Callus short and obtuse or a mere scar. Stamens 3 : styles 

 distinct. Stigmas plumose. Grain oblong, free, tightly enclosed 

 in the glume. 



0. cuspidata Vasey Special Rep. U. S. Dept. Agr. 63, 23. Closely 

 tufted perennial : stems slender thickened at base, solid smooth 12-18 inch- 

 es long : sheaths shorter than the internodes, smooth and close, the upper 

 one longer and loose : ligules ovate, a line long, acute or lacerate : radical 

 leaves numerous, the scarious sheaths clustered thick about the base of the 

 stems, 6-10 inches long, involute : panicle very loose, 4-6 inches long, 

 inclosed at the base, branches mostly in pairs, distant, horizontal, divided 

 in pairs beyond the middle, bearing solitary spikelets on long flexuous pedi- 

 cels : spikelets 3 lines long, first and second glumes equal, inflated and 

 widened below, narrowed above to a long sharp point, scarious except the 

 5 nerves, minutely pubescent: flowering glume ovoid, or oblong, profusely 



