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1 Terminal spike staminate (rarely gynecandrous, with fewer than 25% of the flowers pistillate)
....3 Terminal spikes 5-15 (-20) mm long; anthers 0.7-1.3 (-1.6) mm long
....3 Terminal spikes (18-) 20-35 mm long; anthers (1.0-) 1.6-2.0 (-2.8) mm long
......4 Perigynia papillose, with a short but definite beak, 2.5-4.0 mm long; anthers 2.5-3.5 mm long; pistillate scales about equal to perigynia or slightly longer; pistillate spikes 6-10 mm wide
........5 Perigynia with a short but distinct beak, when mature more-or-less rounded in ×-section and with no faces flattish; blades glabrous or glabrate
..........6 Blades glabrous or glabrate, especially on lower surface, sheaths glabrate to pubescent (if so, pubescence dense only in summit region); [mostly Coastal Plain and Piedmont]
..........6 Blades and sheaths densely hirtellous throughout; [mostly Coastal Plain, Piedmont, and Mountains]