Herbs perennial, (20-)30-100(-115) cm tall, glabrous throughout except for leaflet margin. Rhizomes creeping, without stolons. Stems erect, simple or branched above, striate angled, (9-)12-28(-37)-leaved. Leaves sessile, cauline; lower and middle ones (1-)2-9(-11) × (0.7-)1-3.5(-4.5) cm; terminal leaflet orbicular, broadly ovate, or obovate, (0.5-)1-3(-3.5) × (0.3-)0.6-1.9(-2.5) cm, with a petiolule 2-10(-15) mm, base subcordate, rounded, or rarely cuneate, margin repand or entire and sparsely ciliate, apex obtuse or rounded; lateral leaflets 2-4(or 5) pairs, slightly to distinctly smaller than terminal one, base obtuse or rarely slightly oblique, margin entire or repand and sparsely ciliate, apex obtuse or rounded; proximal pair of lateral leaflets auriclelike, attached at or just above node, often giving appearance of amplexicaul leaf base. Uppermost leaves smaller. Fruiting pedicels ascending or divaricate, (0.4-)0.7-1.5 cm, slender, straight. Sepals ovate or oblong, 2.5-3 × 1.5-2 mm, erect. Petals purple or lavender, spatulate or obovate, 6-9 × (2.5-)3-5 mm, not clawed, apex rounded or subemarginate. Staminal filaments erect, median pairs 3.5-4.5 mm, lateral pair 2.5-3 mm; anthers oblong, 0.9-1.1 mm. Ovules 10-22 per ovary. Fruit linear, (1.5-)2-4 cm × 0.9-1.2 mm; gynophore 0.5-1 mm; valves smooth, glabrous; style 0.5-1(-2) mm; stigma 2-lobed, distinctly broader than style. Seeds brown, oblong, 1.4-1.7 × 0.8-1.1 mm, wingless. Fl. May-Aug, fr. Jun-Sep.
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A cabbage family herb. It keeps growing from year to year. It grows 30-100 cm tall. It has a creeping rhizome. The stems are erect and have 12-28 leaves.