Stoloniferous perennial, the basal part of the stem prostrate and rooting, the rest ± erect, 3–10 dm, glabrous or nearly so, freely and slenderly branched; cauline lvs lanceolate, 3–10 cm × 5–15 mm, tapering to a short petiole or petiolar base, with conspicuous secondary veins; fls sessile, 4-merous; sep 1.5–2 mm; pet none; anthers ca 0.3 mm; fr glabrous or minutely puberulent, cylindric or obscurely 4-grooved, 4–8 mm; 2n=32. Wet or muddy soil or shallow water; coastal plain from se. Va. to Fla. and Tex., n. in the interior to s. Ind. and Kans. July–Sept.
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