Annuals; usually eglandular, rarely glandular; moderately to sparsely pubescent, often glabrous distally, not canescent, trichomes dendritic. Stems erect, unbranched or branched proximally, often branched distally, (1.5-) 3-6.2(-8.5) dm. Basal leaves: petiole 0.4-3.5 cm; blade pinnate, ovate to oblanceolate in outline, 1.5-7 cm, lateral lobes linear or oblong, margins entire or dentate to incised. Cauline leaves sessile or shortly petiolate; blade smaller distally, lobes linear to filiform, margins entire, surfaces usually glabrous, rarely pubescent. Racemes considerably elongated in fruit. Fruiting pedicels horizontal to divaricate, straight, (8-)10-15(-20) mm. Flowers: sepals ascending, yellow, oblong, 1.5-2 mm, glabrous; petals narrowly oblanceolate, 1.7-2.6 cm × 0.5-1 mm; median filaments 1.5-2 mm; anthers 0.3-0.4 mm. Fruits erect, linear, not torulose, (9-)12-17 × 0.8-1.1 mm, (straight or slightly curved inward); valves each with obscure midvein; septum not veined; ovules 18-32 per ovary; style 0.1-0.2 mm, glabrous. Seeds uniseriate, reddish brown, oblong, 1-1.3 × 0.6-0.7 mm. 2n = 14.
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