230 POACE.fi. 



A Hleiulor erect tufted grass, '^0-40 cm. higli. Sheiith.s of tlio 

 culm extending well up the culm; ligulo 1.5-.'3 mm. long; hludes of 

 the sterile shoots involute, filiform, somewhat llexuose, l.')-2& 

 cm. long, those of the culm 6-H cm. long. Panicle simple, thin, 

 linear, ti-Vi cm. long, the lower rays in pairs, the longest 2.5-',i cm. 

 long, bearing 1-2 spikelets. Empty glumes membranous-cihar- 

 taceous, purple at the base, linear, 1-nerved, first IJ-3.5 mm. long, 

 second 4 mm. long; floral glume sparsely clothed with short haira 

 on the lower half, ovate when spread, 3.3 mm. long, including the 

 short obtuse callus and the 2-toothed apex; awn scabrous, irregu- 

 larly bent and slightly twisted, 10-15 mm. long; palea o\al, 2.5 

 mm. long. Grain elliptical, compressed, 2 mm. long. 



California, Bolander G097. 



California and Nevada. 



11. 0. micrantha (Trin. et Rupr.). Thurb. Proc. Acad. Phila. 

 1863, 78 (18G3). 0. micrantha Thurh. Porter and Coult. Syn. Fl. 

 Colo. 145 (1874). Urachne micrantha Trin. & llupr. Mem. Acad. 

 St. Petersb. (VI.) 5:10(1842). 



Culms slender, GO cm. high. Sheaths shorter than the inter- 

 nodes; ligule membranous, not ciliate, 1 mm. long; blades scabrid, 

 involute, or flat, 10-30 cm. long, 2-2.5 mm. wide, in some cases, 

 reaching as high as the panicle, in others much shorter. Panicle 

 exserted, thin, diffuse, 8-lG cm. long, rays mostly in pairs. Spike- 

 lets ovate-lanceolate, 2.5-3 mm. long; awn deciduous. 5-10 mm. 

 long; empty glumes ovate-acute, hyaline, chartaceous, shining, sub- 

 equal, 1-2-nerved near the base on either side of the mid nerve j 

 floret smooth, elliptical, 2 mm. long. 



Moniiiwa,, Anderso7i, Williams; Colorado, Xe//erwan 31 ; Utah, 

 Jones ; Arizona, Vasey for U. S. Dept. Agricul. 296, Jones 4034. 



Colorado to Arizona and Montana. 



12. 0. erecta (Scribn.) Beal, Coult. Bot. Gaz. 15:112 (1890). 

 Stipa Prinylei Scribn., Vasey, Contrib. U. S. Nat. Herb. 3:5i 

 (1802). 



Culms erect, rather slender, GO-120 cm. high. Sheaths longer 

 than the inteniodes; ligule 2-3 mm. long; blades of the sterile 

 shoots numerous, half or two-thirds as long as the culm, scabrous. 



