POACEAE 
e IX. AvENEAE 
Spikelets falling entire: first Eine much smaller than the 
Florets alike, rfect. 
den unlike, the lower perfect, oe 
taminate. and bearing a hooked a 
Spikelets noc falling entire, the glume Hber deem 
Florets 2, the lower staminate, awned; the upper per- 
feet, awnless. 
Hore 2 or more, all alike except the reduced upper 
the upper 
es. 
An arising from between the teeth of a bifid apex, 
flattened, twisted. 
Awn a not flattened: lemma often bifid at 
Spikelets large, the glumes over 1.5 cm. long. 
Spikelets less than 1 cm. lon 
eT ed: awn arising from above the 
Lemmas bidentate: oe 
Lemmas entire: annual. 
Lemmas convex: awn Tom below the middle. 
Rachilla prolonged behind the upper 
a E emmas runcate and  erose- 
ate. 
Rachilla not prolonged: 
into 2 slender teeth. 
lemmas tapering 
e X. CHLORIDEAE 
Spikelets with more than 1 per Nen floret. 
Spikes numerous, slender, e dp dd on an elongate axis. 
Spikes few, digitate or nearly 
Rachis of spike extending borond the spikelets. 
Rachis not prolon 
Spikelets with only 1 weak floret, often with additional 
ga florets above 
ikelet withou addi itio nal the 
Fáchilla Sonic bin e o 
Rachilla P below the glumes, the spikelets 
falling e 
Rachilla A above the 
Spikes digitate: rachilla prolonged. 
Spike es racemose along the main axis: 
not prolonged. 
Spikelets MES DUE. or more modified florets above the 
ec 
BPE o 2 sterile florets below the perfect 
nd glume bearing a squarrose spine 
B die acht spike single, recurved. 
Spikelets with no sterile florets below the pe 
on econd glume 2-190 a squarrose spine 
modified  florets, 
rachilla 
ng the main axis. 
Spikelets distant, appressed: spikes slender, 
elonga 
Spikelets. ‘contiguous or crowded, not ap- 
pressed: spikes usually short, relatively 
stout. 
Tr a XI. FESTUCEAE 
Tall oue reeds with large plume-like panicles: lemmas 
e with long Like” hairs as long as the 
Penne PE rachilla naked. 
Lemmas naked: rachilla hairy. 
Low or rather tall stems, rarely over 1.5 m. tall. 
Plant dioecious, perennial : lemmas glabrous: grasses 
e soil. 
: spikelets obscure, scarcely 
he short crowded rig id leaves. 
rom creeping rootstocks: spikelets in 
a narrow simple exserted panicle. 
Plant not dioecious (except in a few species of Poa 
with villous lemmas and in an annual species of 
Eragrostis). 
62 
19. 
18. 
TI. 
72. 
71. 
80. 
. SPHENOPHOLIS. 
.. NOTHOLCUS. 
. ARRHENATHERUM, 
. DANTHONIA. 
. AVENA. 
: TRISETUM. 
. KOELERIA. 
. AIRA. 
. ASPRIS. 
LEPTOCHLOA. 
DACTYLOCTENIUM,. 
ELEUSINE. 
SPARTINA. 
CAPRIOLA. 
CAMPULOSUS. 
. CHLORIS. 
. GXMNOPOGON. 
. BOUTELOUA. 
. ARU 
82. 
PHBRAGIOIBES: 
MONANTHOCHLOE, 
DISTICHLIS. 
