形态特征：Shrub 0.3–1 m, deciduous during the dry season. All parts dense whitish grey tomentose. Branchlets angulate, not lenticellate. Leaves digitately trifoliolate, 5–18 cm; petiole winged, 2–7 cm; terminal leaflet rhomboid- ovate, 3–11 × 1.5–5.5 cm, while lateral ones smaller and oblique at base; apex of leaflet obtuse, rarely acute. Stipules early caducous, triangular to lanceolate, 3–4 mm. Inflorescence axillary or cauline raceme, 2–7.5 cm. Solitary, or clustered at old branches or rootstock, as many as 10 racemes per node or more. Flower papilionaceous, 11 mm. Bracts tomentose and glandular, triangular to ovate, 3–6 mm, early caducous. Calyx 4 mm, 5-lobed, the lower teeth the longest, outer surface orange glandular and tomentose. Corolla purplish red, all petals subequal in length; standard 8–9 mm, elliptic to ovate, auriculate, short stalked, apex emarginate; wing petals and keel petals long clawed, oblanceolate to obovate. Stamens diadelphous (9+1), 8 mm. Pistil 8 mm, with a shot ovary and long curved style. Pods elliptic, tomentose and glandular, ca. 10 × 5 mm, inflated, 2-seeded.
