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Leaflets 3, 1.2–8 × 0.9–6.5 cm, ovate or rhombic, the laterals oblique, subacute to acuminate, rounded, truncate, cuneate or slightly subcordate at the base, pubescent or glabrescent and gland-dotted above, pubescent to densely velvety (particularly on the venation) and with dense yellow to red gland dots beneath, rarely almost glabrous; venation rather prominent and reticulate beneath; petiole 0.9–6.5 cm long; rhachis 0.9–1.7 cm long; petiolules 0.5–3 mm long; stipules 3.5–13 × 2.5–6 mm, oblong to ovate-lanceolate, sometimes conspicuous, acuminate, subcordate or truncate, veined, pubescent.
Inflorescences axillary, lax, the flowers mostly paired along the rhachis, which is glandular-hairy, 3–14 cm long; peduncle c. 6.5 cm long; pedicels 4–19 mm long, glandular-hairy; bracts deciduous, 6–15 × 2–8 mm, ovate to lanceolate, acuminate, pubescent, the young inflorescences sometimes appearing comose.
Pods yellowish-green when young with distinctive darker green reticulation, later brown, 30–38 × 6–8 mm, narrowly elliptic-oblong, apiculate, densely covered with viscid glandular hairs and also with shorter hairs and gland dots.
Standard yellow, densely veined with dark purple or crimson outside, 13–21 × 8–12 mm, elliptic, glabrous; wings yellow; keel white or yellowish, with purple veins inside at the tip which coalesce to form a purple flush.
Calyx pubescent and glandular; tube 3–4 mm long; lobes 5.5–17 mm long, mostly linear, the lowest longest and widest, the upper pair joined for ± one-quarter to one-third of their length.
Stems glabrescent to mostly rather densely covered with appressed white hairs, particularly on the ridges and with numerous reddish gland dots.
Seeds chestnut-brown with darker mottling, 5.5 × 4 mm, elliptic-reniform.
Perennial climbing herb 1–2.5 m long from a woody rootstock.
