Start Here: Key to groups or selected genera
Group A (unisexual spikelets only, staminate and pistillate spikelets conspicuously different)
Group B (1 floret/spikelet; spike or spicate raceme)
Group C (1 floret/spikelet; panicles without spicate primary unilateral branches)
Group D (1 floret/spikelet; panicle with spicate primary unilateral branches)
Group E (2 florets/spikelet; spikelets paired; reduced floret below perfect floret)
Group F (2 or 3 florets/spikelet; reduced floret or florets below perfect floret; panicle inflorescences)
Group G (2 or more florets/spikelet; spike or spicate raceme)
Group H (2 or more florets/spikelet; inflorescence a panicle of spicate primary unilateral branches)
Group I (2 or more florets/spikelet; reduced floret at spikelet apex; panicle inflorescence)