POACEAE 
Tribe VI. ZIZANIEAE 
Stem Tene low: staminate and pistillate spikelets borne 
arate inflorescences 
Inflorescence a few- “lowered spike: plants not stolonif- 
ous. 
Hore escence a panicle: 
In plants stoloniferous. 
Stem Pas L 
staminate and pistillate spikelets borne 
me panicle. 
Sa in pairs, the larger one sessile and pistillate, 
the smaller staminate and pedicellate. 
Spikelets not pair 
Plant annual: pistillate spikelets on the ascending 
spreading 
l : pistillate spikelets at the ends, the 
siamimate below on the same branches of the 
pan 
Tribe VII. PHALARIDEAE 
Sterile florets reduced to small awnless scale-like lemmas: 
spikelets much compressed laterally. 
Sterile florets consisting of awned hairy empty lemmas 
exceeding the fertile floret: spikelets terete. 
Tribe VIII. AGROSTIDEAE 
Bu Spikelet^ below the glumes, these falling with 
Glunies long-a 
Glumes awnless 
Rachilla end prolonged behind. the palea: 
o united 
panicle 
toward 
eu 
eb 
Rachita . prolonged pucr the palea: panicle 
dense: glumes not MESE 
d cili ate je the n 
Panicle narrow; lem 
twisted awn from 
with a ener bent 
stra 
Rachilla att eulate above the glumes. 
"ruit indurate, terete, awned, the nerves obscure: cal- 
lus weil- developed, oblique, bearde 
Awn trifid, the teral divisions OS short, 
rarely DES pud obsolete no line of demar- 
cation between awn and lemma as in the next). 
Awn simple, a E of demarcation between the aw 
" and the lem 
Fruit Ber or fcn > put scarcely indurate, 
erves prominent or evident: 
Pene ed. 
Glumes longer than the lemm 
Glumes compressed- farinute. abruptly mucronate, 
stifly ciliate on the keels: panicle dense, 
cylindric or ellipsoid. 
Glumes not compressed-carinate, not cilia 
.  Florets bearing a tuft of hairs at nee base 
from the short callus, ut hairs at least 
half as long as the lem 
Florets without hairs at the base or the 
hairs very short. 
Glumes not longer th the lemma, usually shorter 
(the awn-tips longer in Muhle PUA pace: 
if firm the 
callus not well- 
mos 
Lemma awned from the tip or mucronate, 3-5- 
nerved. 
Rachilla prolonged behind the palea: floret 
itate. 
Rachilla not prolonged : floret not stipitate. 
Lemma awnless or awned from the back. 
Callus E ao and palea chartace- 
ous 
Panicles ire ike. Tike: rachilla prolonged. 
Panicles open: rachilla not prolonged. 
Callus. not bearded. 
45. 
Hx 
IN 
Aa 
ww) 
on 
c3 
‘56. 
48. 
49. 
c 
9. 
c 
e) 
51. 
50. 
60. 
61. 
54 
. HYDROCHLOA. 
42. 
LUZIOLA. 
PHARUS. 
. ZIZANIA. 
. ZIZANIOPSIS. 
. PHALARIS. 
. ANTHOXANTHUM, 
. POLYPOGON. 
. ALOPECURUS. 
LIMNODEA. 
. CINNA. 
ARISTIDA. 
STIPA. 
. PHLEUM. 
CALAMAGROSTIS., 
. AGROSTIS. 
BRACHYELYTRUM. 
MUHLENBERGIA. 
AMMOPHILA. 
CALAMOVILFA. 
. SPOROBOLUS 
