1	"Spikelets asymmetric in profile"	"Panicum laticomum"
1	"Spikelets symmetric in profile"	2
2	"Leaves stiff, subulate, and conspicuously distichous; plants tufted, shrubby"	"Panicum pinifolium"
2	"Leaves not stiff and subulate"	3
3	"Upper lemmas glossy brown"	"Panicum atrosanguineum"
3	"Upper lemmas pallid"	4
4	"Lower glumes 1/2-3/4 the length of the spikelets"	5
4	"Lower glumes up to 1/3 the length of the spikelets"	6
5	"Plants coarse, robust annuals; spikelets not gaping"	"Panicum hippothrix"
5	"Plants shrubby perennials; spikelets turgid, gaping"	"Panicum turgidum"
6	"Spikelets 2-3 mm long, obtuse or acute"	"Panicum coloratum"
6	"Spikelets 3-4 mm long, acuminate"	"Panicum subalbidum"