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Coarse, erect, annual or short-lived perennial (0.5)1–2 m, with few or solitary, triquetrous stems, lacking rhizomes; main lvs 1 cm wide; infl of a terminal glomerule, a few erect secondary peduncles terminated by glomerules, and often also tertiary peduncles and glomerules; spikelets mostly 10–30 in each glomerule, widely spreading, 15–23 mm; lower scales empty; a few of the upper larger and each subtending a fl; bristles normally 6, 3 on each side, 10–13 mm, subequal; anthers 3.5–4 mm; achenes flat, brown, obovate, 4.5–5.5 mm, the tubercle forming a beak 16–22 mm. Swamps near the coast from e. Mass. to Fla. and Tex., and n. in the interior to Mo. and s. Mich.
