Description from Flora of China
Herbs perennial, rhizomatous. Trichomes simple, malpighiaceous, or sometimes minutely forked. Stems ascending or decumbent, simple or branched. Basal leaves petiolate, rosulate, simple, entire. Cauline leaves petiolate or sessile, attenuate, entire. Racemes several flowered, bracteate throughout. Fruiting pedicels slender, ascending or divaricate, straight or curved. Sepals ovate, oblong, or obovate, ascending, glabrous or pubescent, base of lateral pair subsaccate. Petals yellowish, white, pink, or purple, caducous or persistent, longer than sepals; blade narrowly to broadly obovate or obcordate, apex shallowly to deeply emarginate. Stamens 6, slightly tetradynamous; filaments of lateral stamens filiform, those of median pairs strongly dilated or appendaged basally; anthers ovate, apiculate or not at apex. Nectar glands confluent, subtending bases of all stamens. Ovules 2 per ovary. Fruit dehiscent silicles, oblong, terete, sessile or subsessile; valves papery, navicular, veinless, glabrous, with 3 rows of crests; replum rounded; septum absent; style to 1.5 mm, cylindric or conical, persistent, glabrous or minutely papillate; stigma capitate, entire. Seeds 1 or 2 per fruit, wingless, oblong, plump; seed coat smooth, not mucilaginous when wetted; cotyledons obliquely accumbent.
* Four species.