An erect, densely branched, somewhat cylindrical shrub up to 150 cm tall. Stems 1-many, pubescent, nitid when villous, internodes short. Leaves digitately trifoliolate, petiolate, ascending, aggregated at the ends of short seasonal shoots. Leaflets 20-30(-35) x 3-3.5(-11) mm; laterals arcuate, asymmetrical, about 2/3 the length of the terminal leaflet; narrowly obovate to obovate, recurved-mucronate, base cuneate, margin finely crenate; surface nitid, densely glandular, glands either sunken or evident only as bumps on the surface, pellucid, drying blackish or reddish brown, glabrous, young leaflets prominently appressed sericeous along midrib and margins; petiole 3.5-4 mm long, persistent after leaf abscission; petiolules 1 mm long. Stipules 3-5 x 3 mm, longer than petioles, obliquely ovate-lanceolate to triangular, striate, membranous, glandular, clasping, pubescent. Inflorescences in axils of short shoots, pedunculate, pedicellate; peduncle 5-7 mm long, comprised of a single triplet of flowers; the triplet subtended by an ovate, 5 x 4 mm, black-haired, glandular bract. Flowers 11-13 mm long, mauve to dark purple. Calyx lobes unequal, 10-12 mm long; much longer than the tube; teeth 6-8 mm long; carinal tooth 6-7 mm wide, 3-4 times wider than other teeth; glabrous except for appressed black hairs along the veins and margins. Standard 12-13 x 7-8 mm, oblong to elliptic, mauve with large purple central nectar guide and veins; scarcely auriculate; claw 2 mm long; apex emarginate, glabrous. Wing petals 13 x 3 mm, claw 3 mm long; twice as long and enclosing keel blades; sculpturing upper basal and left central, comprised of up to 20 transcostal lamellae; tips billowy. Keel petals 6.5-7 x 2 mm, claw 2-2.5 mm long, apex slightly beaked. Androecium 6.5-7 mm long, vexillary stamen fused to lower =3 of adaxially split sheath, anthers 1-2 mm long, equal. Pistil 6-7 mm long; ovary 1.5 mm long, sparsely glandular; height of curvature 1.5 mm; stigma penicillate. Fruits 5 x 3 mm, papery, reticulate, glabrous. Seeds 4-5 x 2-3 mm, chestnut brown, hilum central.
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