AGROSTIDEM 197 



c. Spikelets in pairs in a spike-like panicle; 

 one perfect, the other staminate or neu- 

 tral, the pair deciduous together Lycurus. 



cc. Spikelets all ahke. 



D. Rachilla prolonged behind the palea as 

 a pedicel; glumes very short; inflo- 

 rescence a narrow few-flowered panicle.BRACHYELY- 

 DD. Rachilla not prolonged. [trum. 



E. Lemma awnless; fruit short, ovoid; 



inflorescence an open panicle Milium. 



EE. Lemma awned or mucronate. 



F. Awn slender, straight or flexuous, 

 not twisted nor bent; spikelets 

 small; glumes shorter than the 



lemma Muhlen- 



FP. Awn usually stout, bent or twisted. [bergia. 

 G. Awn stout, twisted and bent, (Par. 2.'51 ). 



persistent; callus pointed, long; 



lemma narrow Stipa 



GG. Awn bent but not twisted, de- (Par. 230 j. 



ciduous; callus short; obtuse; 

 lemma broad, elliptical or 



ovate Oryzopsis. 



AA. Lemma not indurated at maturity, mem- 

 branaceous or hyaline, like the glumes or 

 more delicate. 

 B. Glumes none; low annual. Oregon and 



Washington Schmidtia. 



BB. Glumes present. 



c. Glumes falling with the spikelet, some- 

 times with a portion of the pedicel or 

 branchlet, the articulation being below 

 the glumes (compare Cinna). 



D. Glumes long-awned Polypogon. 



DD. Glumes awnless. 



E. Inflorescence a dense spike-like pan- 

 icle; lemma awned from the lower 



part of the back Alopecurus 



EE. Inflorescence a narrow loose panicle; (Par. 233). 



lemma awned from the bifid apex. .Limnodea. 

 cc. Glumes persistent, not articulated on the 

 pedicel. 

 D. Glumes longer than the lemma. 



E. Glumes plumose; an annual with 



woolly ovoid heads Lagurtjs 



EE. Glumes not plumose. (Par. 237). 



F. Inflorescence a dense cylindrical 

 spike-like panicle; glumes com- 

 pressed-carinate, ciliate on the (Par. 232). 



keels ; lemma awnless Phleum 



