Virgate deciduous shrubs up to 3 m tall. Stems 1-2, distinctly ribbed, verrucose, patently hairy when young becoming glabrous when older. Leaves pinnately trifoliolate, inserted spirally, spreading. Stipules 3-4 mm long, persistent, appressed, subulate. Leaflets variable, stem leaflets larger than those subtending inflorescences, terminal leaflet 30-55 x 18-35 mm, laterals smaller, obovate to very broadly obovate, emarginate, mucro arching, base obtuse to cuneate; young leaflets covered in black appressed hairs, mature leaflets glabrous above, sparsely appressed hairy below, hairs denser along margins; minutely and densely nigro-punctate above in dry state, less so below, glands even sized above, variously sized below; strongly smelling; petiole (5-)15-30(-40) mm long; petiolules 1.0-1.5 mm long; rhachis 5-10 mm long. Inflorescences densely racemose, terminal on short 50-100 mm long, seasonal shoots, occasionally terminating longer leader shoots up to 300 mm long; greatly exceeding subtending leaves; comprised of 20-25 triplets, pedicels 2.5-3.5 mm long; each triplet subtended by a single, pubescent 3.0-4.0 x 1.5-3.0 mm lanceolate bract; bracts being narrower towards the apex. Flowers white, flushed with lilac, 8-9 mm long. Calyx lobes 6 mm long, tube 4 mm long; teeth triangular, slightly shorter than tube, 11 mm wide, vexillar teeth fused higher up; all teeth densely black velutinous outside, glabrous inside; finely and evenly glandular over the entire calyx. Standard 9-10 x 7-8 mm, broadly elliptic, claw 3 mm long, scarcely auriculate; appendages absent, apex emarginate. Wing petals 3 mm longer than keel, 9 x 2.5-3.0 mm with a 3.0-3.5 mm long claw, undulate, incurving at tip; sculpturing present, upper central comprised of 10-12 vertical irregular transcostal lamellae. Keel petals 6.5 mm long, 2 mm wide with 3.0-3.5 mm long claw, lower margins fused. Androecium 6.5 mm long, vexillar stamen fused for half its length; sheath fused for lower half, fenestrate. Pistil 6 mm long; ovary 2 mm long, hairy, height of curvature 1.5 mm; style thickened at point of flexure; stigma capitate, papillose. Fruits 8 x 3-4 mm, covered in short black patent hairs, apex acute, lower margin convex-concave, upper margin straight becoming humped near the end, asymmetrically oblong. Seeds 3.5 x 2.5 mm, chestnut brown, hilum nearly central.
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