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Stems stout and tough, clustered, 3–10 dm; lvs aerenchymatously hollow and transversely evidently septate, but also flattened and ± equitant, basal and cauline, the basal ones 1–5 dm × 3–6(–8) mm; cauline lvs 3–several, well spaced, the lower like the basal, the upper smaller; infl terminal, well surpassing the invol bracts, these mostly 1–8 cm; heads mostly 15–75, often individually sessile on the ± elongate branches, hemispheric to subglobose, many-fld, 7–15 mm thick; fls eprophyllate; sep green to brownish-stramineous, rigid, slender, gradually tapering, 3.5–4.5 mm, the pet similar but a bit shorter; stamens 3, included; fr slender, trigonous-subulate, unilocular, surpassing the sep by 1–2 mm; seeds rather few, plump, 0.3–0.4 mm. Wet places, as along ditches, streams, and ponds; se. Va. to Fla. and Tex., and inland to w. Tenn., Mo., and Okla.
