32 POACEAE 
Tribe II. ANDROPOGONEAE 
Spikelets all perfect, surrounde d by copious soft hairs 
Rachis continuous, E spikelets LES Spikelets of 
e pair unequall y pedicellat 
Racemes in a narr e spike- S ike panicle: spikelets 
awnless. 
Racemes in an open, usually flabellate, panicle: 
Spikelets awne 
Rachis breaking up into joints at maturity with the 
p ES one spikelet Dey the other 
ct m 
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erile spikelet conspicuous 
Rachis. int and pedicel disti nct, the sessile d 
let appressed to them, its first glume lane 
ate. 
Races subcylindrie: rachis-joints and pedicels 
glabrous, much thicker at the summit, the 
spikelets sunken in the hollow below: sterile 
spikelet rudimentar 
Racemes flat: rachis: -joi ints and pedicels woolly, 
Pe voe m at the summit: sterile spike- 
neuter. 
Pedicel not A I "df slightly so the spikelets 
awned), neither id nor adnate to the 
rachis joint, this usually slender: spikelets usu- 
a 
Fertile spikelet with a hairy- -pointed callus, formed 
of ene attached suppor ting rachis-joint or 
pedicel: awns stron 
n E ran ced to a single joint, long- -pedun- 
c Pi simple open panicle. 
S Uf several to many joints, s 
e ng. 
Racemes of several to no ny j nes. solitary, digi- 
tate, or aggrega 
Racemes reduced to 1 or few joints: these mostly 
pedu Bele in a subsimple or compound 
anicle. 
Pedicellate spikelets staminate. 
Pedicellate E wanting, the pedicel only 
ribe III. NAZ 
Bm with flat leaf-blades m: Spikes of Pus n spike- 
Tribe IV. PANICEAE 
Spikelets E DARE d leaf-blades petioled. 
“Spikelets all perfect 
Spikelets of 2 kinds, aerial and subterranean. 
a Spikelets all of one k ind. 
ikelet S sunken in the cavities of the flattened 
Spikelets not s sunken in the 
Spikelets subtended or Sur Pout nded by 1 to many 
2 2x e Ra distinct r more or less con- 
an involucre. 
Bristles An. the spikelets deciduous. 
PESEE a with the spikelets at ma- 
Brístles ‘not united at base, slender, often 
se. 
Bristles united into a bur-like involucre, 
the bristles Sem barbed. 
5. IMPERATA. 
6. MISCANTHUS. 
7. SACCHARUM. 
8. ERIANTHUS. 
10. RYTILIX. 
9. MANISURIS. 
11. ELYONURUS. 
15. RHAPHIS. 
16. HETEROPOGON. 
12. ANDROPOGON. 
13. HOLCUS. 
14. SORGHASTRUM. 
17., NAZIA. 
38. OLYRA. 
3í. AMPHICARPON. 
36. STENOTAPHRUM. 
33. CHAETOCHLOA. 
34. PENNISETUM. 
35. CENCHRUS. 
