Perennial climbing herb 0·3–1·8 m. long from a woody rootstock.. Stems with spreading ferruginous or yellow hairs and shorter adpressed white pubescence.. Leaflets 3, nearly always variegated above with paler green along the midrib, typically elliptic or elliptic-ovate, less often ovate-rounded or rhomboid, the laterals slightly oblique, 0·8–7·5 cm. long, 0·9–4 cm. wide, acute or less often obtuse or rounded at the apex, rounded at the base, pubescent on both surfaces, minutely gland-dotted beneath; venation slightly raised and reticulate above; petiole 0·5–5 cm. long; rhachis 0·1–1·1 cm. long; petiolules 1–2·5 mm. long; stipules lanceolate to ovate, 0·4–1·1 cm. long, 1–3 mm. wide, veined, pubescent.. Inflorescences with a rhachis 1·4–11 cm. long; peduncle 2–8 cm. long; pedicels 1·5–2 mm. long; bracts ovate-lanceolate, ± 2–6 mm. long, 1–2 mm. wide, often deciduous.. Calyx pubescent and with some tubercular-based hairs; tube 1·5–3 mm. long; lobes linear-triangular, 2–6 mm. long, the lowest the longest, the upper pair joined for ± half their length.. Standard yellow inside, veined purplish-crimson or reddish-brown or rose flushed outside, obovate, 0·9–1·1 cm. long, 7–8 mm. wide, finely pubescent or covered with spaced tubercular-based hairs; wings and keel yellow or greenish.. Pod oblong, 1·8–2·4(–2·8) cm. long, 5·5–7 mm. wide, acute at the apex, narrowed to the base, covered with yellow tubercular-based hairs, short white hairs and glands or sometimes only puberulous.. Seeds dark reddish-brown, oblong, longest dimension 3·5 mm., shorter dimensions 1·5 mm.
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