Herbs perennial, (20-)40-100(-160) cm tall, glabrous throughout. Rhizomes creeping, without stolons. Stems erect, simple or branched above, rooting from lowermost nodes, striate angled, 11-25-leaved. Leaves sessile, cauline; lower and middle ones 2.2-6(-10) cm; terminal leaflet orbicular or broadly obovate, 3-12 × 3-11 mm, with a petiolule 0.5-6 mm, base subcordate or cuneate, margin repand and not ciliate, apex obtuse or rounded; lateral leaflets (7 or)8-11(-15) pairs, slightly smaller than terminal one, ovate or ovate-oblong, base obtuse, margin repand and not 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 divaricate, 1-2 cm, slender, straight. Sepals oblong, 2.5-3 × 1.5-2 mm, spreading. Petals purple or lavender, obovate, 7-9 × 3-4 mm, not clawed, apex rounded. Filaments spreading, subequal, 4-5 mm; anthers narrowly oblong, 1.5-1.7 mm. Ovules 10-16 per ovary. Young fruit glabrous; styles 2-4 mm; stigma entire. Immature seeds wingless. Fl. Jun-Jul.
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