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A herb. It is a climbing plant that keeps growing from year to year. It grows 5 m long. The stems can form roots at the nodes and then produce tubers at this point. The plant is covered with soft yellow hairs. The leaflets are narrowly oval and hairy. The standard of the flowers is pink to violet inside and white near the throat. The pods are winged and square or X-shaped in cross section. The seeds are square to round. There are 8-13 seeds per pod. The seeds are reddish-brown.
Standard glabrous, green-tinged outside and purple towards the base, blue inside and tinged white or white veined towards the base, 1.5–2.4 × 1–2 cm, obovate, apex obcordate, base auriculate; wing and keel petals blue, white-tinged at the base, wings 9–18 × 4– 8 mm, narrowly obovate to oblong, with basal appendage to 3 mm long; keel 8–17 × 6–15 mm.
Calyx 5-lobed, glabrous to densely covered with spreading golden or brown hairs; tube 4–5 mm long, upper lobes 1–2 mm long, fused for almost all of their length; lateral lobes 1–2 mm long, triangular; lower lobe 3–5 mm long, narrowly lanceolate, indumentum more dense here than on the rest of the calyx.
Inflorescence axillary, subumbellate to umbellate; peduncle 2.5–16 cm long; rhachis (if subumbellate) to 10 mm long; pedicels 2–11 mm long; bracts 5–8 × 1–2 mm, lanceolate to narrowly ovate; bracteoles 8–12 × 5–9 mm, striate, sparsely to densely pilose with golden spreading hairs.
Leaflets 1.8–8 × 1–3.2 cm, elliptic, lanceolate or narrowly ovate to ovate, somewhat lobed, sparsely to densely pilose with golden hairs on the upper and lower surface; petiole 1.5–6.5 cm long; stipules appendaged below the point of insertion, 8–18 mm long overall.
Seeds reddish-brown, 4 × 3 × 2 mm; hilum 1–2 mm long, transversely bisecting the pale broadly elliptic aril.
Pod black, 3.2–7 × 0.5–0.7 cm, oblong, with 4 striate wings 2–3 mm wide, 11–15-seeded.
Ovary 5–12 mm long, cylindrical; stigma terminal or internal, penicillate.
Stems with appressed or spreading hairs.
Perennial climbing herb to 5 m long.
