CXIII. GRAMINEiE 
575 
Spikelets in panicles. 
Spikelets in pairs, the terminal ones sometimes in 
threes. 
Spikelets dissimilar, unawned, each spikelet enveloped 
in a tuft of long hairs 12. Saccharum. 
Spikelets dissimilar, awned, terminal spikelets usually 
in threes ......... 19. AndrGpogon. 1 
Spikelets similar, awned, each spikelet more or less 
enveloped in a tuft of hairs . . . . .13. Erianthus. 
Spikelets 7-9 in a spike, only 1-3 of the upper ones 
fertile, awned, terminal spikelets in threes. Spikes 
in clusters of 2-8, each cluster and each spike sheathed 
in a spathe-like bract ...... 20. Anthistiria. 
Spikelets all in threes. 
Spikelets awned, all 1-flowered, sessile spikelet male, 
stalked ones 2-sexual. The otherwise naked panicle- 
branches bearing at the tip 3 spikelets . . .10. Spodiopogon. 
Sessile spikelet 2-flowered ; one of the stalked spike- 
lets reduced to an empty glume, the other con- 
taining a male flower. Naked panicle-branches 
bearing at the tip 3 spikelets sheathed in a pointed 
bract 17. Apluda, 
Spikelets awned, all 1-flowered, sessile spikelet 2- 
sexual, stalked ones male or rudimentary. Naked 
panicle-branches bearing at the dilated tip 1-4 groups 
of 3 spikelets each 19. Andropogon. 2 
SERIES B. POACEvE. Spikelets not jointed below the empty 
glumes, the joint or joints, if present, always above them, one- to 
many-flowered ; if more than one, the lower flower or flowers 
fertile, the upper often male or rudimentary, except in Phrag- 
mites. Rhachilla often prolonged above the uppermost flowering 
glume. 
Tribe IV. Phalaridese. Spikelets \ in., in ovoid or cylindric, 
spike-like panicles, flattened, 1-flowered. Empty glumes 2, nearly 
equal, longer than the flowering glume, keels winged. Rhachilla 
not prolonged 21. Phalaris. 
Tribe V. Agrostidese. Spikelets in dense, spike-like or more 
or less spreading panicles, 1-flowered or occasionally 2-flowered in 
Agrostis Boyleana. Rhachilla rarely prolonged. 
Spikelets in dense, ovoid or cylindric, spike-like panicles. Flowering glume 
thin, transparent. 
Empty glumes equal, their keels terminating in short 
points 26. Phleum. 
Empty glumes awnless, united near the base . . . 27. Alopecurus. 
Empty glumes awned on the back below the tip . . 28. Polypogon . 
1 Species 3, 4 and 5. 
2 Species 6 and 7. 
