Annuals; hirsute or hispid, (trichomes cylindrical). Stems usually few to several, rarely simple from base, erect to ascending or (outer ones) decumbent, branched distally, (0.15–)0.6–3(–3.8) dm. Basal leaves (later withered); not rosulate; petiole (0.4–)1–3.5(–5) cm; blade spatulate to oblanceolate, lyrate-pinnatifid, pinnatisect, or 2-pinnatifid, (0.7–)1.5–4.5(–7.5) cm × (9–)12–20(–30) mm, margins rarely dentate, (lobes) entire or dentate. Cauline leaves subsessile or petioles 0.8–2.2 cm, blade lanceolate to oblanceolate, (0.7–)1.2–3.3(–5) cm × (2–)4–12 mm, base cuneate, not auriculate, margins subentire to dentate. Racemes often considerably elongated in fruit; rachis hirsute or hispid, trichomes straight, cylindrical. Fruiting pedicels divaricate-ascending to horizontal, straight or slightly curved, (often strongly flattened), (1.8–)2–4(–4.6) × 0.2–0.7 mm (to 0.3 mm thick), hirsute to hispid throughout or adaxially. Flowers: sepals oblong, 1–1.3(–1.5) × 0.5–0.8mm; petals (sometimes absent), white, oblanceolate to linear, (0.3–)0.6–1.5(–2) × (0.1–)0.2–0.5 mm, claw absent; stamens 2, median; filaments 1–1.4 mm; anthers 0.2–0.3 mm. Fruits ovate to ovate-orbicular, 2.8–4(–4.6) × 2.4–3.6(–4) mm, (base broadly cuneate to rounded), apically winged, apical notch (0.2–)0.3–0.6(–0.7) mm deep; valves thin, smooth, not veined, hirsute to hispid (on surface or margin); style obsolete or to 0.1 mm, included in apical notch. Seeds ovate, 1.4–2.2 × 0.9–1.4 mm.
