Erect or spreading subshrubs. Young branches triangular columnar, densely grayish brown pubescent. Leaves with fingers 3 leaflets; Stipules are linear-lanceolate, about 0.6- 1 cm long, longitudinally striated, hairy, tapering at the apex, persistent; Petiole 2-2.5 cm long; Leaflets are thick papery, oblong or ovate-lanceolate, oblique 4-7(-9) cm in length and 1.7-3 cm in width, with blunt apex, sometimes small convex tip, round base, sparsely pubescent on the top and densely grayish brown pilose on the back; Basal vein 3, lateral vein and reticular vein are somewhat concave above, convex below, and lateral leaflets are slightly smaller; Petiole is extremely short, densely pubescent.

Racemes are axillary, usually 2-2.5 cm long, and each part is densely grayish brown to grayish white; Bracts narrowly ovate-lanceolate; Flowers dense, with short stalks; Calyx lobes lanceolate, much longer than calyx tube, covered with gray-white long hairs; Corolla purplish red, about the same length as calyx, flag petal oblong, with extremely short peduncle at the base, inconspicuous ears on both sides, falcate wing petal, elliptic keel petal and slightly curved keel petal, with peduncle at the base and 1 pointed ear at one side; Staminal diploid; Ovary is hairy.

Pods elliptic, 7-8 mm long and 5 mm wide, pubescent; 2 seeds, nearly spherical, black. Flowering and fruiting periods are summer and autumn.