Annuals. Stems few to several from base, erect, branched distally, (0.7–)1–6(–7) dm. Basal leaves: petiole (0.5–)1–4(–5) cm; blade lanceolate, oblanceolate, or ovate, (1.2–)2–5(–6) cm × (5–)10–20(–30) mm, base cuneate, margins usually dentate, sinuate, rarely pinnatifid. Cauline leaves (distal) shortly petiolate or sessile; blade ovate, lanceolate, or oblong, 1–4(–5) cm × (3–)10–20(–30) mm, base cuneate, margins entire, dentate, or repand. Racemes considerably elongated in fruit. Fruiting pedicels 1.5–2.5 mm. Flowers: sepals purple to lavender, linear, (6–)7–9(–10) × 0.8–1.2 mm; petals white to pale lavender, (10–)12–15 × (1.5–)2–3 mm; filaments 6–7 mm; anthers 1.5–2(–2.5) mm. Fruits: valves transversely ovate to suborbicular, 3.5–5(–6) × 4–6(–7) mm, base and apex rounded, pubescent, trichomes clavate, simple, papillate (branched trichomes rarely present on fruit margin); style 0.1–0.5(–1) mm. Seeds 3–4 × 1.5–2.5 mm. 2n = 20.
