FESTUCEJ^ 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 Blephari- 



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-f ringed ; 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. 



BE. 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- 



II. Glumes shorter than the [lium. 



lemmas. 

 J. Spikelets subterete. Spar- 

 ingly introduced from 

 Europe Molinia. 



