1	"Racemes distinctly hairy with white spreading hairs"	2
1	"Racemes not distinctly hairy with white spreading hairs"	3
2	"Leaf blades flabellate; racemes in compound spatheate    inflorescences"	"Andropogon virginicus"
2	"Leaf blades not flabellate; racemes simple, digitate, terminal"	"Andropogon eucomus"
3	"Leaf blades falsely petiolate; lower glume of sessile spikelet entire at apex"	"Andropogon gayanus"
3	"Leaf blades not falsely petiolate; lower glume of sessile  spikelet bifid at apex"	"Andropogon distachyos"