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Leaflets 3, 6–15 × 0.2–1.3 cm, oblong-lanceolate to lanceolate, acuminate to somewhat rounded and mucronulate at the apex, rounded or subcordate at the base, rather thick, glabrous except for some marginal papillae; lateral nerves very numerous, forming a right-angle with the midrib; venation raised and reticulate on both surfaces; petiole 2–7.5 cm long; rhachis 1–5 mm long; stipules 2–4 mm long, ovate-lanceolate, prolonged and cordate at the base, multinerved.
Calyx glabrous or sparsely pubescent; tube 2 mm long; lobes 1–2 mm long, deltate, ciliate, the lower as long as the laterals; upper pair united to form a slightly emarginate lip.
Flower yellow, 8–10 × 8–12 mm; pedicel 1.5–3 mm long, not expanding as the pod matures; bracteoles 1.5–2 mm long, ovate-lanceolate, 1-nerved.
Peduncle 0.5–10 cm × 0.2–0.8 mm, glabrous; rhachis 0.2–1.5 cm long, 2–7-noded, internodes 1–5 mm long, rarely up to 8 mm.
Pod 5–6 cm × 4–5 mm, linear-cylindrical, almost straight, compressed, glabrous or glabrescent, with a small curved beak.
Standard with two central appendages; keel slightly twisted towards the right, the beak short.
Seed 2.8–3 × 1.5–2 × 1.2 mm; hilum excentric; aril excentric, well developed.
Perennial climbing or trailing herb, 0.3–2 m long.
A glabrous twiner, with wiry stems to 6 ft. long,
Stem slender, wiry, glabrous.
Blue or yellow flowers
Ovary 8–10-ovuled.
