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Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.

Key to Chasmanthium

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1 Panicle branches elongate, pendulous; spikelets (15-) 20-40 mm long, with 6-20 flowers
1 Panicle branches short, erect or ascending; spikelets 5-18 mm long, with 2-8 (-11) flowers.
..2 Fully-developed spikelets 12-18 mm long, 8-12 mm wide.
....3 Axils of the spikelets and panicle branches glabrous; empty lemmas (0-) 1 (-2); [se. NC south to c. peninsular FL and e. FL Panhandle]
....3 Axils of the spikelets and panicle branches with a tuft of long hairs; empty lemmas 2-4; [w. FL Panhandle west to e. LA (Florida parishes)]
..2 Fully-developed spikelets 4-9 mm long, 3-7 mm wide.
......4 Collar (junction of leaf and sheath) and sheath glabrous or nearly so; leaves 3-7 mm wide
......4 Collar (junction of leaf and sheath) and sheath pilose; leaves 6-12 mm wide.
........5 Inflorescence with divergent branches; [outer Coastal Plain calcareous sites from SC southward]
........5 Inflorescence with appressed branches; [more widespread in our area]
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