Annuals, biennials, or perennials; (cespitose or not, woody or not at base); glabrous or pubescent. Stems simple to several from base, erect to ascending, often branched (several) distally, 0.4-5(-7) dm. Basal leaves rosulate or not; petiole (0.5-)1.2-5.3(-7.6) cm; blade 1-or 2-pinnatifid to pinnatisect, or, rarely, undivided, (0.8-)1.5-4(-6) cm, margins (of lobes) entire or dentate. Cauline leaves shortly petiolate; blade similar to basal, or undivided and linear, smaller distally, base cuneate to attenuate, not auriculate. Racemes often much-elongated in fruit; rachis usually puberulent, rarely glabrous, trichomes straight or curved, cylindrical. Fruiting pedicels divaricate to horizontal, slightly recurved or somewhat sigmoid, (terete), (2.7-)3.3-8.5(-10) × 0.2-0.3 mm, sparsely to densely puberulent adaxially. Flowers: sepals oblong to broadly ovate, 1.2-1.8(-2.1) × 0.8-1.2 mm; petals white, spatulate to oblanceolate, 2.2-3.7(-4.3) × 1.3-1.8 mm, claw 1-1.4 mm; stamens 6; filaments 1.4-2.2 mm, (glabrous); anthers 0.4-0.5 mm. Fruits usually ovate to suborbicular, rarely oblong, 2-4.3(-5) × (1.5-)1.8-3.6(-4) mm, apically winged, apical notch 0.1-0.3 mm deep; valves thin, smooth, not veined, usually glabrous, rarely puberulent; style obsolete 0.2-0.7(-0.9) mm, usually exserted beyond, rarely subequaling, apical notch. Seeds oblong, 1.2-1.8 × 0.7-1 mm. 2n = 32.
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