e lower portions of the rachilla of the
spikelets may have long hairs.

Sub. Tribe 1. =Maydeae.=

The spikelets are all unisexual, spicate, the male
and female spikelets are dissimilar, and are on the
same or on different spikes.

Fruiting spikelets enclosed in a stony nut-like
polished bract 16. Coix.

Fruiting spikelets with the first glume
forming a crustaceous nut-like envelope
to other glumes and grain 17. Polytoca.

Sub. Tribe 2. =Sacchareae.=

The spikelets are all similar, in compound racemes
or panicles; the first glume not sunk in the
hollow of the rachis. Spikelets are 1-flowered.

Rachis not fragile; spikelets in cylindrical
silvery thyrsus 18. Imperata.

Rachis fragile; spikelets in open very much
branched silky panicles 19. Saccharum.

Sub. Tribe 3. =Ischemeae.=

Spikelets many, dissimilar, in solitary, digitate
or fascicled racemes or spikes; first glume not
sunk in the hollow of the rachis.

Margins of the first glume of the sessile spikelet
inflexed.

Spikes rarely solitary; spikelets binate,
2-flowered and awned 20. Ischaemum.

Spikes solitary; spikelets 1-flowered; first
glume of the sessile spikelet pectinate 21. Eremochloa.

Margins of the first glume of the sessile spikelet
not inflexed.

Spikes solitary or binate; spikelets 1- to
2-flowered, diandrous; first glume broad
and truncate 22. Apocopis.

Spikes 2 or more; spikelets binate, upper
alone awned 23. Lophopogon.

Sub. Tribe 4. =Apludeae.=

Spikelets three on an inarticulate rachis 24. Apluda.

Sub. Tribe 5. =Rottboellieae.=

Spikelets similar or dissimilar, 1- to 2-flowered,
solitary, 2- or rarely 3-nate on the internodes of
an articulated spike or raceme, not awned; the
first glume is not keeled, sunk in a cavity of
joints of the rachis; sessile spikelets 4-glumed.

Sessile spikelets single; first glume flat 25. Rottboellia.

Sessile spikelets geminate in all except
the uppermost joints 26. Mnesithea.

Sessile spikelets binate; first glume globose,
pitted