crq 
351 
(29) PANICUM l.iun. 
Spikelets in spikes, racemes, or j')anicles, 1 to 2-liowered. First empty 
Inme usually smaller than the second and the latter as large as and 
similar to the third which often encloses a staminate flower. Flowering- 
glume and ])alea indurated, awnless or very short awned. 
Species about 350 in the tropical and temperate regions of the world; 30 in the 
Philippines. 
1. Spikelets terete or dorsally compressed, 
2. Branchlets of the panicle not produced beyond the ter- 
minal spikelets into awn-like bristles. 
' 3. Spikelets 1 to 2-seriate, close-set on the under- 
side of the flat rhachis of a simple spike, the 
spikes alternally arranged in a simple raceme. 
(Si Paspaloide^.) 
4. Spikes shorter than the internodes 
4. Spikes exceeding the internodes. 
5. Tip of spikes excurrent beyond the 
upper spikelets, setlform ; second 
glume one half as long as the 
flowering glume 
5. Tip of spikes not produced ; second 
glume nearly as long as the flower- 
ing glume 
3. Spikelets 3-4-seriate, crowded on the under sur- 
face of a simple or branched spike, ovoid, the 
empty glumes usually muricate and the second 
and third cuspidate or rigidly awned. (§ Ecm- 
NOCHLOA.) 
4, Awn of the third glume very short or 
almost wanting. 
5. A coarse erect grass 
5. A slender low grass, the culms usually 
prostrate, at least below 
4. Awn of the third glume elongated, mostly 
many times longer than the spikelet. 
„ 5. Erect ; panicles purplish ; spikelets 2 
to 3 mm. long 
5. Prostrate, aquatic ; panicles green ; 
spikelets 4 to 5 mm. long 
3. Spikelets irregularly 1— 2-seriate on slender or 
spiciform branches of a simple raceme, solitary 
or geminate, distant or crowded, not confined 
to one side of the rhachis, (§ Brachiaria.) 
4. Spikelets silky-villous 
4. Spikelets glabrous. 
5. First glume as long as the spikelet..., 
5. First glume two thirds as long as the 
spikelet or less. 
6. Spikelets 1.5 to 3 mm. long. 
7. Spikes about 2 cm. long ; 
spikelets 1.5 mm. long.. 
7. Spikes 3 to 4 cm. long ; 
spikelets 3 mm. long.... 
6. Spikelets 4 mm. long ; tips of 
the empty glumes thickened 
keeled-apiculate 
3. Spikelets small, crowded in spiciform or narrow 
cylindrical panicles (except P. aurit-um) , the 
flowering glume slightly indurated, narrow, 
usually much shorter than the third glume. 
(§ Hymenachne.) 
(1) P. ftavidum 
(2) P. punctatum 
(3) P. paspaloides 
(5)P. crus-gaUi miiUcum 
(4) P. colonmn 
(5) P. crus-galU 
(6) P. stagninuin 
(9) P. villosum ' 
( 7 ) P. cunhiguum 
(81 P. pi'ostratiuii 
(10) P. rcmotum 
(11) P. crassiapiculatuin 
