Annuals; hirsute (trichomes cylindrical). Stems often several from base, erect to ascending or decumbent, branched distally, (5-)1-2.4(-3.2) dm. Basal leaves not rosulate; petiole (0.5-)1-3 cm; blade 1-or 2-pinnatifid, 0.7-3.5 cm, margins (of lobes) entire or dentate. Cauline leaves usually sessile, rarely shortly petiolate; blade obovate to oblanceolate (in outline), 0.8-2 cm × 2-9 mm, base cuneate, auriculate or not, margins dentate to laciniate or pinnatifid. Racemes elongated in fruit; rachis hirsute, trichomes mostly straight, cylindrical. Fruiting pedicels divaricate to horizontal, usually slightly recurved, rarely straight, (terete), 2-3.5(-5) × 0.2-0.3 mm, puberulent adaxially or, rarely, throughout. Flowers: sepals (tardily deciduous to somewhat persistent), ovate to broadly oblong, 0.7-1 × 0.4-0.6 mm; petals (absent or rudimentary), white, linear-oblanceolate, 0.1-0.7 × 0.05-0.15 mm, claw absent; stamens 2, median; filaments 0.7-1 mm; anthers 0.15-0.2 mm. Fruits orbicular to broadly obovate or elliptic, 2.2-3.5 × 2-3 mm, apically winged, apical notch 0.2-0.3 mm deep; valves thin, smooth, not veined, glabrous or sparsely puberulent (along margin); style to 0.1 mm, included in apical notch. Seeds ovate, 1.2-1.6 × 0.7-1 mm.
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