36 , POACEAE 
Lemmas _3-nerved, the nerves prominent, often hairy. 
Lemmas pubescent on the nerves or callus: mid- 
l 
Palea sometimes villous, but not long-ciliate 
on the upper EM lf. 
Lemmas not pubescent on the nerves or callus 
(the Len Sometimes sparsely pubes- 
Lemmas chat aceods grain large and 
beaked, at maturity forcing the lemma and 
palea open. 
Lemmas membranaceous, if firm the grain 
neither large nor beake 
po E 2. E _many- -nerved, the nerves sometimes 
Spikelets "with 1 to 4 mo lemmas below the 
Aa rulg florets: nerves obscure: lemmas 
Spikelets "with no empty lemmas below the fer- 
tile florets: nerves usually prominent: 
mas membranaceous (firm in a few 
species of Bromus and Festuca). 
Lemmas keeled on the back. 
Uc strongly compressed, crowded i 
sided clusters at the ends of the stiff 
Baba d panicle-branches 
Spikelets Sot Strongly compressed, not 
wded in 1- jeg clusters. 
Tenma awned from a minutely bifid 
r n B. 
mius the summit in 
0 
tumes „papery lemmas firm, strongly 
ved, scari ous- -margined : upper 
foret- sterile, often reduced to a 
club-shapéd rudiment enfolded by 
the broad upper lemmas: spikelets 
tawny or purplish. 
Glumes not papery: LUBDEE florets not un- 
awnless, mostly obtuse. 
Nerves of the lemma converging at pes 
ummit : lemmas awned 
te 
Florets minute: spikelets many- 
en in small rigid pani- 
Florets 4 mm. or more long: spike- 
lets few a several flowered, 
not in rigid panicles. 
Lemmas entire, pd from the 
.pointe 
Een awned or awn- d 
m a minutely bifid a 
Tribe XII. HORDEAE 
Spikelets solitary at each node of the rachis. 
Spikelets placed edgewise to the rachis: glume 1 except 
rachi 
e achis 
Spikelets 3 at each node of the rachis, ul flow erei; the 
ateral pair pedicelled, usually reduced to awns. 
LM 2 e each node of the rachis, 2- to 6-flowered, 
all ali 
Glumes usually equalling the florets: spikelets ap- 
a or ascending. 
Glumes A or reduced to 2 short bristles: 
spikelets Muy spreading at maturity: 
` spikes very loose 
84. 
. TRIODIA. 
Qo 
Oo 
90. 
95. 
on 
(ep) 
d 
98. 
TRIPLASIS, 
. DIARINA. 
. ERAGROSTIS. 
. UNIOLA. 
DACTYLIS. 
BROMUS. 
POA. 
. MELICA. 
. PANICULARIA, 
. SCLEROPOA. 
. FESTUCA. 
. BROMUS. 
. LOLIUM 
í. AGROPYRON. 
HORDEUM. 
ELYMUS. 
. HYSTRIX. 
