Description from Flora of China
Rhynchosia sect. Eriosema Candolle, Prodr. 2: 388. 1825.
Herbs or subshrubs, erect or almost erect, usually with root tubers. Leaves 1-foliolate; stipules linear or linear-lanceolate; leaflets usually with sessile glands abaxially. Inflorescence axillary, 1- or 2-flowered to racemose. Calyx campanulate, 5-lobed. Corolla usually longer than calyx; standard obovate, abaxially silky hairy, base clawed, with auricles; wings and keels usually much shorter than standard. Stamens diadelphous; vexillary stamen free; anthers uniform. Ovary sessile; ovules 2; style filiform, glabrous; stigma small, capitate. Legume rhombic-elliptic or oblong, dehiscent, inflated, not septate. Seeds 1 or 2, oblique; hilum linear, funicle at one end.
About 130 species: worldwide; one species in China.
(Authors: Sa Ren (萨仁); Michael G. Gilbert)