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Leaflets 3, 3–7 × 0.5–3 cm, linear-oblong, oblong-lanceolate or ovate, acute to rounded and mucronulate at the apex, rounded to slightly subcordate at the base, sometimes slightly subhastate, glabrous or nearly so; secondary veins leaving midrib almost at a right-angle; petiole 1.2–3 cm long; rhachis 0.3–0.6 cm long; stipules 3–6 × c. 2 mm, lanceolate, often reflexed, truncate or very slightly bilobed at the base, multinerved.
Flower yellow, tinged with mauve, 10–13 × 12–14 mm; pedicels 0.5–2 mm long, not expanding as the pod matures; bracteoles 1.5–2 mm long, ovate-lanceolate, 1-nerved.
Peduncle 5–9 cm × 0.5–1.8 mm, 3-winged (mainly in the lowest part), glabrous to puberulous; rhachis 3–25 mm long, 3–12-noded, longest internode 2 mm long.
Calyx glabrescent; tube 1.5–2 mm long; lobes 1–2.5 mm long, ciliolate, lower lobe slightly longer, upper lobes united into an emarginate lip.
Seed small, 1.5–2.5 mm in diameter, subglobose to cubic, white when fresh, cream-coloured later; hilum central, without an aril.
Standard with two central appendages; keel with a short beak up to 2 mm long, slightly twisted towards the left.
Perennial prostrate, trailing or twining herb, 0.6–1.8 m long.
Pod 4–5 cm × 3–4 mm, linear, cylindrical, with a curved beak.
Alternate anthers with a pair of glands at their base.
Ovary 13–18-ovuled; style tip almost not beaked.
Stem glabrous, usually ± winged.
Pollen exine not reticulate.
