1	"Lower glume of sessile spikelets flat to shallowly concave, with a fine V-shaped median groove in the lower third, laterally winged on the keels"	2
1	"Lower glume of sessile spikelets flat to deeply concave, with the bottom of the depression rounded throughout its length, keels not winged"	4
2	"Leaves over 8 mm wide, dark green; ligules sarious, rrely over 1 mm longl inflorescences 20-70 cm long; stems robust"	"Cymbopogon giganteus"
2	"Leaves up to 8(-10) mm wide, glaucous; ligules membranous, 1-4 mm long; inflorescences 5-10 cm long; stems wiry"	3
3	"Lower glume of sessile spikelets with grooves flanked by brown oil-streaks"	"Cymbopogon nervatus"
3	"Lower glume of sessile spikelets without oil-streaks"	"Cymbopogon caesius"
4	"Sessile spikelets unawned, scarcely winged"	"Cymbopogon citratus"
4	"Sessile spikelets awned"	5
5	"Lowermosst pedicesl not swollen"	"Cymbopogon pospischilii"
5	"Lowermost pedicels swolledn and barrel-shaped"	6
6	"Lower glume of sessile spikelets with keels sharpley inflexed throughout"	"Cymbopogon schoenanthus"
6	"Lower glume of sessile spikelets with keels rounded on lower portion"	"Cymbopogon commutatus"