Shrubs, 1-2 m tall. Young branches often distinctly quadrangular, sparsely shortly appressed hairy. Petiole adaxially angled, often slightly convex above, bisulcate and narrowly winged along both sides, 1-5 cm, shortly appressed hairy; stipels absent; leaflets oblong to ovate, terminal one 3-10 × 1.5-5 cm, abaxially appressed hairy particularly on veins and margin, adaxially glabrous, base rounded, apex obtuse to rounded and retuse and mucronulate. Racemes 3-15 cm; rachis and pedicels with ± dense appressed to ascending short hairs and sparse glandular hairs. Pedicels 6-8.5 mm. Calyx with densely appressed short hairs and glandular hairs; tube 2-2.5 mm; lobes narrowly triangular, 3-4.5 mm. Corolla purple; standard elliptic, 10-13 mm, apex obtuse; wings 10-12.5 mm, clawed at base; keel incurved, 12.5-15 mm, clawed at base. Ovary 2.5-3 mm, shortly appressed hairy; style incurved, ca. 10 mm. Legume ovoid, 6-9 × 4-5.5 mm, shortly ascending hairy, apex obtuse. Seeds purplish black, reniform, ca. 2 × 4 mm. Fl. and fr. Oct-Dec.