Annuals or, rarely, perennials; (short-lived, terrestrial or of wet habitat, not submerged); glabrous or hirsute, (trichomes cylindrical). Stems (few to several from base), usually ascending, decumbent, or prostrate, rarely erect, branched distally, 1-4.2(-5) dm, (hirsute proximally). Basal leaves not rosulate; blade margins pinnatifid. Cauline leaves shortly petiolate or sessile; blade oblong or oblanceolate to obovate, (terminal lobe oblong), (2-)3.5-10(-12) cm × (5-)10-30(-37) mm, (lateral lobe smaller than terminal), base usually auriculate, rarely amplexicaul, margins: proximal pinnatifid or sinuate, distal dentate or entire, (surfaces sparsely pubescent). Racemes elongated. Fruiting pedicels divaricate-ascending to horizontal, straight or recurved, (1.2-) 1.7-5(-8) mm. Flowers: sepals erect, oblong, 0.8-1.8 × 0.5-1 mm; petals (erect), yellow, oblanceolate to spatulate, 0.5-1.8 × 0.2-1 mm; median filaments 0.9-1.3 mm; anthers ovate, 0.3-0.5 mm. Fruits silicles or siliques, curved, ovoid to pyriform, 2-8(-8.8) × (0.5-) 1-2.5 mm; valves glabrous; ovules (20-)30-80 per ovary; style 0.3-1 mm. Seeds biseriate, brown, cordiform, 0.5-0.7 mm, colliculate. 2n = 16.
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