FESTUCE& 221 



E. Callus and nerves of lemma densely 

 bearded ; lemma 3-nerved, the nerves 

 ending in teeth or lobes. 

 F. Empty lemmas 2 below the fertile 

 floret; spikelets with 1 fertile 

 floret and a 3-awned rudiment 

 above; low desert perennials BLEPH A RI- 

 FF. Empty lemmas none at base of [DACHNE. 



spikelets. 



G. Hairs not extending along the 3 



conspicuous nerves of the 



lemma; panicle large and open.REDFiELDiA. 



GG. Hairs extending from the callus 



along the nerves of the lemma. 



H. Palea ciliate-fringed ; midnerve 



excurrent between the lobes 



of the lemma TRIPLASIS. 



HH. Palea not ciliate-fringed; the 

 3 nerves of the lemma often 

 extending into teeth, the 



apex sometimes 2-lobed TRIDENS. 



EE. Callus and nerves of lemma glabrous 

 or pubescent, sometimes cobwebby 

 but not bearded. 



F. Plants tufted and creeping, annual; 

 spikelets hidden among the short 

 sharp-pointed leaves. Western. . . MUNROA. 

 FF. Plants with distinct inflorescence. 

 G. Lemmas coriaceous, rounded on 

 the back, smooth and shining, 

 the margin not scarious. 

 H. Empty lemmas 1 to 4 at base of 

 spikelets; spikelets strongly 



compressed UNIOLA. 



HH. Empty lemmas 2 to 4 at 

 summit of spikelet; spikelets 



not compressed DIARRHENA. 



GG. Lemmas membranaceous, or if 

 somewhat coriaceous, the mar- 

 gins scarious. 

 H. Lemmas 3-nerved (Sphenoph- 



olis might be sought here). 

 i. Glumes longer than the 



lemmas. California DISSANTHE- 



n. Glumes shorter than the [LIUM. 



lemmas. 



j. Spikelets subterete. Spar- 

 ingly introduced from 

 Europe MOLINJA, 



