FESTUCEHA 221 
x. Callus and nerves of lemma densely 
bearded; lemma 3-nerved, the nerves 
ending in teeth or lobes. 
r. Empty lemmas 2 below the fertile 
floret; spikelets with 1 fertile 
floret and a 3-awned rudiment 
above; low desert perennials..... BLEPHARI- 
rr. Empty lemmas none at base of [DACHNE. 
spikelets. 
c. Hairs not extending along the 3 
conspicuous nerves of the 
lemma; panicle large and open. REDFIELDIA. 
cc. Hairs extending from the callus 
along the nerves of the lemma. 
H. Palea ciliate-fringed; midnerve 
excurrent between the lobes 
Of the lem: ca. 5. 2 ko TRIPLASIS. 
nH. 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. 
r. Plants tufted and creeping, annual; 
spikelets hidden among the short 
sharp-pointed leaves. Western... MuNROA. 
FF. Plants with distinct inflorescence. 
Gc. Lemmas coriaceous, rounded on 
the back, smooth and shining, 
the margin not scarious. 
Hu. Empty lemmas | to 4 at base of 
spikelets; spikelets strongly 
COMIPTeESsed . 1G). owes ee 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. 
u. Lemmas 3-nerved (Sphenoph- 
olis might be sought here). 
1.Glumes longer than the 
lemmas. California....... DISSANTHE- 
1. Glumes shorter than the [LIUM. 
lemmas. 
J. Spikelets subterete. Spar- 
ingly introduced from 
Marepe! oss Gee LRN s Mo.ini4, 
