Annuals; hirsute. Stems often several from base, usually ascending or decumbent to prostrate, rarely erect, branched distally, (0.4-)0.7-1.7(-2) dm. Basal leaves not rosulate; petiole 0.5-3 cm; blade 2-pinnatifid (lobes lanceolate to oblong), 1.5-5.6 cm, margins (of lobes) entire. Cauline leaves shortly petiolate; blade pinnatifid, 0.8-3 cm × 0.3-8 mm, base cuneate to attenuate, not auriculate, margins (of lobes) entire. Racemes elongated, (dense) in fruit; rachis puberulent, trichomes straight, cylindrical. Fruiting pedicels suberect and subappressed at base, recurved and becoming divaricate distally, strongly curved, (often flattened and narrowly winged), (1-)1.4-2.5(-3) × 0.2-0.4 mm, puberulent adaxially. Flowers: sepals (persistent), oblong, 0.7-1(-1.2) × 0.3-0.4 mm; petals (rudimentary), white, linear, 0.2-0.5 × 0.05 mm, claw absent; stamens 2, median; filaments 0.5-0.8 mm; anthers 0.1-0.15 mm. Fruits ovate-orbicular to ovate, 2.5-3.3 × 2-3 mm, apically winged, apical notch 0.3-0.6 mm deep; valves (enclosing seeds), thin, smooth, reticulate-veined, glabrous or puberulent on margin; style obsolete or to 0.1 mm, included in apical notch. Seeds oblong, 1.2-1.6 × 0.7-0.8 mm. 2n = 32.
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Annual herb to 20 cm high, decumbent to erect, pubescent with dense, fine, reflexed hairs. Leaves bipinnatifid to laciniately lobed, the lobes linear, 2–3 mm wide. Inflorescence a crowded raceme. Sepals to 1 mm long, tending to persist. Petals rudimentary. Stamens 2, median. Stigma subsessile. Silicula ovate, 2–3 mm long, 2–2.5 mm wide, reticulate, glabrous except rarely the margins; wings in upper half, acute, one-sixth fruit length, forming open notch; pedicels to 3 mm long, winged, pubescent especially on margin and adaxial surface. Seeds 1–1.5 mm long; radicle incumbent.
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