AVENE.E. 371 



Texas, Colorado, California to Alaska. 



9. D. gracilis Vasey, Coult. Bot. Gaz. 10:324 (1885). 

 Culms smooth, slender, 3U-T0 cm. high. Ligulu 4-5 mm. 



long, a(!uminat(S blades smooth, filiform, G-10 cm. long. Pani- 

 cle 15-'^'0 cm. h>ng, lax and o])en, rays mostly in twos, the lower 

 ones G-lO cm. long, slender, llower-bearing to or below the middle. 

 Em[)ty glumes e<iual, linear-lanceolate, tinged with purple and 

 brown, 3-nerved, and about 3.5 mm. long; llorets overla])})ing for 

 o:ie-third their length, an awn stjirting near the middle of eaeh 

 iloret, o-G mm. long, rachilla villous; floral glume 1.5 mm. or 

 more long, 1 mm. wide, 4-toothed, faintly nerved; palea as long as 

 its glume, narrow, incurved, ciliato above, 2-toothed. Grain com- 

 pressed, half oval, 1 mm. long. 

 California, Orcutf in 1884. 



10. D. elongata (Hook.) Munro. Benth. PI. Ilartw. 342 

 (185T). Aim elomjata Hook. Fl. Hor. Am. 2:243 (1840). 



Culms very slender, often tufted, 20-GO cm. high. Lignle 

 acute, 4 mm. long; blades very narrow, 4-15 cm. long, mostly 

 smooth. PaTiicle narrow, simple or branching, about one-third as 

 long as its culm, rays capillary, scabrous, appressed, bearing spike- 

 lets above the middle. Empty glumes equal, oval-lanceolate or 

 linear-lanct'olate, 3-4 mm. long, 3-nerved, longer than the florets, 

 green and scabrous on the keel; florets 2 mm. long, shining, over- 

 lapping for one-third or more of their length, silky hairs reaching 

 to the middle; floral glume broad, nerves very obscure or none, apex 

 api)arently 5-toothed or lacerate, the slender awn starting near or 

 below the middle and twice the length of its glume; terminal part 

 of the rachilla about two-thirds as long as the upper floret: palea 

 about as long as its glume, 2-toothed, curved. Grain 1.5 mm. 

 long, flattened, straight on the outside, grooved. 



Jones for U. S. Dept. Agricul. 4591. 



British America to California. 



Var. ciliata Vasey, ined. 



Culms GO-80 cm. high; ligule 8 mm. long; blades less involute 

 and softer; panicle often 30 cm. long; awns longer. 



Oregon, Howell; California, Dr. Anderson. 



