9 



very thin and hyaline, often bearing a twisted and bent awn. A palea to 

 each flower, sometimes very small or deficient in the fertile flower. Stamens 

 three, rarely fewer. 



(The awn when present is terminal or between the notches of the flower- 

 ing glume in all except Arthraxon.) 



Subtribe I. — Zoysiese. — Spikelets solitary or rarely in clusters of two or 

 three, inserted all round the articulate rhachis of a simple spike or raceme. 

 Awns none on the flowering glume, none or straight on the outer ones. 



Spikelets sessile in notches of the rhachis and closely 

 appressed. 

 Glumes two, smooth... ... ... ... 14. Zoysia. 



Spikelets two, rarely three or four together on very 

 short pedicels. 

 Glumes usually three, the larger one 

 echinate, a minute outer one sometimes 

 wanting and a small hyaline flowering 

 one ... ... ... ... ... 15. Lappago. 



Spikelets in a dense spike, not awned. Glumes four, 



the outer one the largest ... ... ... 16. Neurachne. 



Spikelets in a loose spike or raceme, very narrow. 



Glumes three, the two outer ones with 



straight awns ... ... ... ... 17. Perotis. 



Subtribe II. — Rottboelliese. — Spikelets awnless, in pairs or rarely 

 solitary, in alternate notches of the articulate rhachis of a simple spike, one 

 sessile fertile and more or less embedded in a cavity of the rhachis, the other 

 pedicellate. 



Spike one-sided, the rhachis scarcely articulate. 



Pedicel-like spikelet barren ... ... 19. Hemarthria. 



Subtribe IV.— Euandropogonese. — Spikelets in pairs or threes, rarely 

 solitary, one sessile and fertile and one or two pedicellate and male neuter or 

 rudimentary, rarely fertile or deficient. Flowering glume of the fertile 

 spikelet usually awned or reduced to the awn. 



(The awn is deficient in Imperata, in Ischaemum pectinatum, and some- 

 times minute or deficient in some varieties of other species.) 



Spikelets in pairs along one side of a simple spike 

 or of the spike-like branches of a simple 

 panicle. 



Spike single. Spikelets unisexual, the awned 

 females turned to one side, the awnless 

 males imbricate behind them... ... 24. Heteropogon. 



Spikes single or digitate. Sessile spikelet with a 



male flower below the fertile one ... 25. Ischaemum. 



Spikes digitate. Spikelets one-flowered with a 

 barren pedicel in the same notch. Awn 

 dorsal near the apex ... ... ... 27. Arthraxon. 



Spikes digitate. Spikelets in pairs, both one- 

 flowered and usually fertile ... ... 28. Pollinia. 



Spikes solitary digitate or several nearly sessile 

 on a simple rhachis. Sessile spikelet 

 one-flowered and fertile, pedicellate one 

 male or neuter ... ... ... ... 29. Andropogon. 



