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Glabrous annual 2–4 dm, normally erect and branched; lower lvs oblong-oblanceolate, coarsely crenate and often ± pinnatifid below the middle, the upper progressively smaller, petiolate, oblanceolate to ovate, entire to crenate; sep strongly saccate; pet wanting; stamens 3–6; mature pedicels widely divergent, 0.5–2 mm; frs spreading or ascending, thick (often over 2 mm), often slightly falcate, 7–10 mm, with numerous (commonly 150–200) seeds, these tiny (to 0.5 mm), deeply pitted, appearing rough at 10×; style to 0.4 mm, or none; 2n=16. Wet soil and shallow water; Fla. to Tex., n. to D.C., O., Ind., s. Minn., and Neb. May–Oct. (Radicula s.)
