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Leaflets 3, 1.2–14 × 1–13 cm, oblate, obovate, rhombic or ovate, the laterals oblique, all leaflets rounded, subacute or acute, rounded to slightly subcordate at the base, sparsely pubescent to practically glabrous on both surfaces and gland-dotted beneath; venation usually raised and rather reticulate beneath; petiole 1.3–9.5 cm long; rhachis 0.5–5.5 cm long; petiolules 1–4 mm long; stipules 4–9 × 0.5–2 mm, lanceolate, nervose, pubescent.
Inflorescences axillary and terminal, sometimes branched, lax to very dense, sticky and pubescent, held erect, lengthening in the fruiting stage, 5–28 × 4–5(14 when branched) cm, above a peduncle 0.5–10 cm long; flowers mostly paired; pedicels 3–11 mm long; bracts subpersistent, 4–10 × 1.5–4.5 mm, ovate-lanceolate, pubescent.
Calyx sometimes accrescent in the fruiting stage, pubescent and densely glandular, veined; tube 3–5 mm long; lobes elliptic-oblong, ovate-lanceolate or oblong-lanceolate, the lowest the longest, 8.5–17 × 2–6 mm, the laterals 5–15 × 1.5–4.5 mm, the upper pair joined only at the base or to about the middle.
Standard orange, usually red flushed outside and veined with purple or red, 11–16 × 7–9.5 mm, elliptic or obovate, mostly pubescent at the apex; wings deep yellow; keel pale or greenish-white with purple or pink tip.
Pods well exserted or enclosed within the persistent calyx, 10–17 × 4–6 mm, oblong, sometimes reticulated with green, glandular and pubescent.
Stems sometimes woody and ridged, pubescent and glandular or glabrescent.
Seeds brown, mottled, 3.5–5.5 × 3–4 × 2–3 mm, rounded oblong-reniform.
Robust to slender perennial climbing or trailing herb, 1–4 m long.
