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.
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