POACEAE 
Spikelets in groups of 2-5, the groups fall- 
m entire dim the continuous axis: lem- 
membranous. Tribe III. NAZIEAE. 
Glumes incur a fertile lemma and palea 
B te, at least firmer than Sic glumes : sterile 
lemma like the glumes in textur Tribe IV. PANICEAE. 
Spikelets, E to many-flowered, the reduced florets, if 
ny, ove the perfect florets (except in Phala- 
placa sterile lemmas below as well as above in 
eral flow Tribe XIII. BAMBUSEAE. 
Plants Bea ous, the stem a l. 
pikelets with 2 er R T ie: neuter or rudimen- 
tary Tan mas eee and below the fertile 
conan no erile or rudimentary florets 
ove Tribe VII. PHALARIDEAE. 
Spikelets without sterile lemmas below the per- 
fect floret (or us rarely present and 
like the fertile on | 
Spikelets unisexual, articulate below the 
glumes, 1-flow terete or nearly so. Tribe VI. ZIZANIEAE. 
Spikelets’ perfect rarely unisexual but then 
sc ue ve),usually articulate above 
e glu 
Spikelets "ar eats below the glumes, 1- 
owered, very flat, the lemma and 
D about equal, both keeled; glumes 
mall or wanting. Tribe V. ORYZEAE. 
Spikelets articulate above the glumes 
rarely c but the glumes, at 
S y elo A ). 
ee eee : the rachis disar- 
ticulating in Hordeum) : articu- 
lation above the glumes except 
in Spartina. 
Spikelets on opposite sides of the 
rachis: spike terminal, dps i Tribe XII. HORDEAE. 
Spikelets on one side of the 
is: oc usually mous than G 
1 digitate or racemo Tribe X. CHLORIDEAE. 
Spikelets pedicellate in onen or ĉon- u 
Ds cted, sometimes  spike-like, a. 
BD E -— . 
Spikelets r flowered. Tribe VIII. AGROSTIDEAE. 
Spikelets 2- to many-flow ul E 
lumes as long as the pee est Pigs 
floret, usually as long as the 
Spik elet : lemmas awn e 
from the back (awnless in 
Koeleria and Sphenopholis). Tribe IX. AVENBEAE. 
de: Shorter than the first 
emmas awnless or 
d ue the tip or from 
a bifid Tribe XI. FESTUCEAE. 
Tribe I. TRIPSACEAE 
Fruiting ee not enclosed in a hard be ad-like involucre. 
tam 
enclosed by large bracts. 
Pistillate ee separate, the rachis articulate: 
fruits enclo 2. EUCHLAENA. 
nme spikes uni ited into a thick receptacle-like 
cob fruits v QUE 3. ZEA. 
Fruiting ‘spikelets enclos ed in hard bead-like involucre 
f rom the indurate Puerto of the subtending 
. COIX. 
