Shrublets, erect or almost erect, 0.8-1 m tall. Branchlets subterete, densely pubescent, glabrescent. Leaves pinnately 3-foliolate; stipules ovate to ovate-lanceolate, pubescent; petiole 2-7 mm, pubescent; stipels small, bristlelike; petiolules 2-3 mm, pubescent; leaflets obovate-oblong to oblong, 4.5-7 × 1.5-2.8 cm, almost leathery, abaxially densely adpressed pubescent, adaxially glabrous, lateral veins 5-7 pairs, obvious, reticulate veins dense, visible, base rounded or cuneate, apex rounded, slightly emarginate. Raceme axillary, 2.5-5 cm, sparsely shortly villous; peduncle ca. 3 cm; bracts small, ovate. Flowers large, ca. 4 cm, usually paired; bracteoles 2, elliptic, 7-8 mm. Calyx membranous, 5-lobed; lobes ovate, much shorter than tube. Corolla light purple, 2 × or more as long as calyx; standard almost orbicular, base clawed, apex emarginate; wings rhomboid, base long clawed with small auricles; keels semicircular, base long clawed. Legume brown or light brown, linear-ellipsoid, 3-4 cm, inflated, with short beak, near ventral suture with 1 longitudinal rib at each side, clothed with micro-villous hairs. Seed dark brown, suborbicular. Fl. Jul, fr. Aug-Dec.
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A shrub. It has woody roots. It grows about 1 m tall. The leaves are divided 3 times. The leaflets are narrowly oval and hairy underneath. The base is wedge shaped and the tip is rounded. The flowers are light purple and in the axils of the leaves. The fruit is like a bean with a short beak and a rib along each side.
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