72 A FLORA OF MANILA 
5. Staminate and pistillate spikelets 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. ) 2 
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 spikeass.....0t2.. 14). ee 3. Dimeria 
7. Spikelets in pairs, the spikes forming a white, cylindric, 
spike-like pamicle..._.828 49 00> Meat Te 4, Imperata 
6. Axis of the spikes jointed. 
7. Spikes solitary, terminal. 
8. Spikelets in pairs at each joint of the rachis. 
5. Pogonatherum 
8. Spikelets in threes at each joint of the rachis. 
6. Polytrias 
7. Spikes 2 to many, digitate or crowded on the short main 
axis. 
S. PDUSGICLA SOULARYs.-. 205.008 tene ec ena oeeaaeee 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: 22 Me 2 Sue: Bee ee oe 14. Ischaemum 
7. Spikes in a much-branched panicle upon an elongated main 
ARIS LAS ETS OPE AOR ee Ao ES ee ge 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 
6 af Sf ae ag Aa pin ED ced ay ahs A A baat 11. Manisuris 
B.7 CMPIBClOLS  BONLARY..o-.55 coos tees ee pace eee ee eee 12. Ophiurus 
5. Spikelets dissimilar; joints of the spikes not thickened nor 
excavated. 
6. Sessile spikelets 2-flowered. 
7. Spikes reduced to a terminal] joint, with 3 spikelets, more 
or less enclosed by a sheathing leaf............ poe 13. Apluda 
7. Spikes with many joints, digitate or in pairs; spikelets 
AWNEG:.2 2098 Whee Roeee ae Shelia 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 
|<: lamellae LE Set IR Lt ia! PRU Die be 15. Themeda 
7. Fertile spikelets not surrounded by a whorl of sterile or 
WATE ONS. 2c. -ooacsn scene oe eee aoe 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. 
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