1	"Leaves tghtly inrolled, less than 1 mm wide, with reduced blades; stems branched throughout forming dense cushions up to 25 cm tall"	"Andropogon aridus"
1	"Leaves flat or loosely inrolled, 1.5-8 mm wide, with well developed blades"	2
2	"Stems profusely branched throught, forming dense bushes up to 2(-3.6) m tall and 1.8 m across"	"Andropogon kelleri"
2	"Stems branched only at the base, if at all; plants not at all bushy"	3
3	"Rhachis-internodes and pedicels cuneate; lower blume of sessile spikelets deeply depressed between the dorsal keels"	"Andropogon pungens"
3	"Rhachis-internodes and pedicels filiform to cuneate; lower glume of sessile spikelets flor or slightly convex but with a shallow median depression between the lateral keels"	4
4	"Inflorescences a large, leafy false panicle"	"Andropogon gayanus"
4	"Inflorescences of paired (rarely more) terminal racemes"	5
5	"Lower glumes of sessile spikelets coarsely scabrous with conspicuous veins in the depression; plants densely tufted with a cushion of old leaf sheaths"	"Andropogon leprodes"
5	"Lower flumes of seessile spikelets smooth, with no veins in the depression; plants loosely or densely tufted, sometimes mat-forming but without a cushion of old leaf sheaths at the base"	6
6	"Pedicellate spikelets 1-2-awned; sessile spikelets narrowly lanceolate to narrowly elliptic; pedicels linear to slightly clavate"	"Andropogon amethystinus"
6	"Pedicellate spikelets unawned; sessile spikelets linear to lanceolate; pedicels filiform to linear"	"Andropogon greenwayi"