Subshrubs, ca. 1 m tall. Stems erect, gray-yellow hispidulous. Leaves pinnately 3-foliolate; petiole 2-4 cm, gray-yellow pubescent; leaflet blades oblong, obovate-oblong, or broadly ovate, terminal one 3-7 × 2-4 cm, abaxially gray-yellow villous, adaxially pilose on veins, lateral veins 6-8 on each side of midvein. Panicles terminal, 20-40 cm, gray-yellow hairy, sparsely flowered, 1-or 2-flowered at each node. Pedicel filiform, 8-10 mm, elongated to 1.3 cm at fruiting. Calyx ca. 3 mm; lower lobes ca. as long as tube or shorter. Corolla purple, ca. 4 × as long as calyx. Ovary pilose. Legume ca. as long as pedicel, 4-or 5-jointed, subglabrous, reticulate veined. Fl. and fr. Sep-Oct.
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