Annuals; puberulent. Stems simple to numerous from base, erect to ascending or decumbent, sometimes branched distally, (0.4-)1-3.5(-4.2) dm. Basal leaves (soon withered); not rosulate; petiole (0.4-)1-4.2(-5) cm; blade pinnatisect (lobes usually linear to filiform, rarely oblong to lanceolate), (0.8-)1.5-7.3(-8) cm, margins (of lobes) usually entire, rarely dentate. Cauline leaves petiolate or subsessile; similar to basal, blade smaller, sometimes undivided and linear, base attenuate, not auriculate. Racemes much-elongated, (lax) in fruit; rachis puberulent to hirsutulous, trichomes straight, cylindrical. Fruiting pedicels usually divaricate, rarely ascending or suberect, usually slightly or weakly recurved, rarely straight, (strongly flattened), 2.5-5(-6.5) × (0.4-)0.6-0.9 (-1.1) mm, puberulent adaxially and sometimes on proximal 1/3 abaxially. Flowers: sepals oblong-ovate, (0.7-)0.9-1.3(-1.5) × 0.5-0.8 mm; petals (rarely rudimentary or absent), white, oblanceolate, (0.8-)1.2-2 (-2.8) × 0.2-1(-1.6) mm, claw absent, (glabrous); stamens usually 4, median, rarely 6; filaments (0.5-)0.7-1 (-1.3); anthers 0.1-0.2 mm. Fruits orbicular to broadly ovate, (2.5-)3-5.5(-6.5) × (2-)2.6-5(-5.4) mm, apically winged, apical notch 0.3-0.7(-1) mm deep; valves thin, smooth, slightly veined or not, usually glabrous, rarely minutely and sparsely puberulent (along margin); style usually obsolete, rarely to 0.1 mm, included in apical notch. Seeds ovate-oblong, 1.6-2.6 × 0.9-1.2 mm.
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