Herbs annual, (25-)35-100(-125) cm tall. Stems erect, branched above, glabrous or sparsely to densely soft pubescent at least near base, usually glabrous above. Basal leaves rosulate, often fleshy; petiole (1-)2-5(-8) cm; leaf blade broadly oblanceolate to oblong-oblanceolate in outline, lyrate-pinnatipartite to lyrate, (1.5-)3-15(-26) × (0.5-)1-6(-9) cm, dentate or rarely subentire; lateral lobes 1 or 2(or 3) on each side of midvein, much smaller than the oblong, dentate terminal lobe. Uppermost cauline leaves narrowly lanceolate or linear, often entire, rarely lobed. Fruiting pedicels horizontal to divaricate-ascending, stout and narrower than fruit, 5-10(-12) mm. Sepals oblong-linear, spreading, 4-6 × 1-1.5 mm. Petals yellow, spatulate, 6-10(-12) × 1.5-2.5 mm; claw subequaling sepals. Filaments yellowish, erect, 3-6 mm; anthers oblong, 1.5-2 mm. Ovules 90-150 per ovary. Fruit narrowly linear, stout, terete, (5-)7-10(-12) cm × 1-1.5 mm, usually recurved; valves glabrous or pubescent, subtorulose; style stout, 0.7-2(-2.5) mm; stigma 2-lobed; septum slightly thickened. Seeds oblong, 0.9-1.3 × 0.5-0.7 mm, inserted in depressions of septum. Fl. Jun-Aug, fr. Aug-Sep. 2n = 14.
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