Annuals; usually glabrous, sometimes sparsely hirsute, (trichomes cylindrical). Stems (usually few-branched from base, rarely simple), ascending or decumbent to prostrate, (0.5-)1-4(-6) dm, branched distally, (glabrous or hirsute proximally). Basal leaves not rosulate; blade margins pinnatifid. Cauline leaves petiolate or sessile; blade oblong, oblanceolate to spatulate, or obovate, (lateral lobes linear to oblong or ovate), (2-)3-9(-13) cm × 8-20(-35) mm, (lateral lobe smaller than terminal), base auriculate, margins usually pinnatifid to pinnatisect, rarely pectinate, or (terminal lobe) entire or dentate. Racemes considerably elongated. Fruiting pedicels divaricate-ascending to horizontal, straight, 1-4.5 (-9) mm, (glabrous or sparsely pubescent). Flowers: sepals (rarely persistent), ascending, oblong, 0.8-2 (-2.5) × 0.6-1.4 mm; petals (spreading), yellow, oblong to oblanceolate, 0.6-1.8(-2) × 0.3-1.3 mm; median filaments 1-1.7 mm; anthers ovate, 0.4-0.5 mm. Fruits siliques, curved-ascending, oblong to linear, 4-13 (-18) × 1-2 mm; valves glabrous; ovules (30-)42-106 per ovary; style 0.1-0.8 mm. Seeds biseriate, brown, cordiform, 0.5-0.7 mm, colliculate. 2n = 16.
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