A flora of Manila - Rainforestation

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A FLORA OF MANILA
5. Staminate and pistillate spikelet's in the same inflorescence.
2. Coix
4. Spikelets usually in pairs, sometimes solitary or in threes, one
sessile and one or two pedicellate, in the same inflorescence, the
sessile one perfect, the pedicelled usually male or empty. (Tribe
Andropogoneae.)
5. Spikelets all similar, perfect; joints of the rachis not much
thickened nor excavated for the reception of the spikelet.
6'. Axis of the spikes continuous.
7. Spikelets solitary, in several, slender, unilateral, digitately
arranged spikes 3. Dimeria
7. Spikelets in pairs, the spikes foiTning a white, cylindric,
spike-like panicle 4. Imperata
6. Axis of the spikes jointed,
7. Spikes solitary, terminal.
8. Spikelets in pairs at each joint of the rachis.
8. Spikelets in threes at each joint of the rachis.
5. Pogonatheruyn
6. Polytrias
7. Spikes 2 to many, digitate or ci-owded on the short main
axis.
8. Spikelets solitary 7. Arthraxon
8. Spikelets in pairs, one sessile and one pedicelled.
9. Spikelets 1-, rarely 2-flowered, when 2-flowered the
first empty glume with a median furrow.. 8. Pollinia
9. Spikelets 2-flowered, the first empty glume not
furrowed 14. Ischaemum
7. Spikes in a much-branched panicle upon an elongated main
axis 9. Saccharum
5. Spikelets dissimilar, the joints of the spike cylindric, more or
less hollowed out for the reception of the spikelets.
6. Spikelets in pairs.
7. First empty glume flat; very coarse grasses.. 10. Rottboellia
7. First empty glume globose; a slender, much-branched
grass 11. Manisuris
6. Spikelets solitary 12. Ophiurus
5. Spikelets dissimilar; joints of the spikes not thickened nor
excavated.
6. Sessile spikelets 2-flowered.
7. Spikes reduced to a tenninal joint, with 3 spikelets, more
or less enclosed by a sheathing leaf 13. Apluda
7. Spikes with many joints, digitate or in pairs; spikelets
awned 14. Ischaemum
6. Sessile spikelets 1-flowered; grasses of various habit with
awned or unawned spikelets.
7. Fertile spikelets surrounded by a whorl of sterile or male
ones 15. Themeda
7. Fertile spikelets not surrounded by a whorl of sterile or
male ones 16. Andropogon
3. Flowering glumes similar in texture to the empty ones, never hyaline
or thin; inflorescence spicate, solitary, the spikelets falling singly
or in groups.