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Leaflets 1.1–5.5 × 0.1–2 cm, ovate-elliptic, elliptic or lanceolate, obtuse to acute at the apex, rounded at the base, glabrous on both surfaces or sparsely puberulous beneath, sometimes microscopically dotted above; petioles 0.6–4 cm long; rhachis 1–7 mm long; petiolules 0.5–2.8 mm long; stipules 1.3–3.1 mm long, oblong-lanceolate.
Standard pale pink or maroon outside, darker along the middle, pinkish-mauve inside, purple at the base or with a violet-edged white zone, 1–1.8 × 0.8–1.8 cm, rounded to squarish, emarginate; wings pinkish-mauve; keel pinkish-mauve, white along the lower margin.
Inflorescences 1–3-flowered; peduncles 0.4–7 cm long; pedicels 1.4–6.1 mm long, pubescent; bracts and bracteoles persistent, 1.5–3 mm long, lanceolate to oblong-lanceolate.
Calyx glabrous or sparsely puberulous; tube 2.3–5.5 mm long; lower lobes 0.7–3 mm long, triangular, ciliolate; upper pair joined to form a bifid lip.
Seeds brown with black mottling, 2.5 × 1.8–2 × 1.5 mm, oblong-ovoid or squarish, glabrous; hilum elliptic, minute.
Pods 3.3–4.6 cm × 3.5–4 mm, linear, acute, margined, glabrous or minutely puberulous along the margins.
Perennial trailing or climbing herb up to 1 m long, from a slender rootstock.
Stems slender, branched, glabrous or sparsely puberulous.
