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Leaves 3-foliolate; leaflets 1–4.5 × 0.5–2 cm, narrowly ovate to elliptic-lanceolate, narrowed to an obtuse, mucronulate apex, rounded at the base, glabrous or sparsely appressed puberulent on both surfaces; petioles 1.2–3 cm long; rhachis 1.5–5 mm long; petiolules 1 mm long; stipules 3–4 × 1–2 mm, elliptic-lanceolate, striate; stipels 1–2 mm long, linear.
Standard greenish-yellow or cream-coloured, often with a faint mauve mark inside, 6–13 × 4–8 mm, oblong-obovate, emarginate; wings 5–10 mm long; keel 6–11 mm long.
Seeds yellow-brown with black mottling or mottled orange, pale buff and greyish-black, 2–3 × 2 × 1–1.5 mm, oblong, compressed, the margins keeled.
Calyx glabrous or glabrescent; tube 1.5–2 mm long; lobes 1.5–3 mm long, ciliate, the upper pair almost completely or completely fused.
Flowers axillary, solitary or paired; pedicels 1 mm long; bracts 1 mm long; bracteoles 2–3 mm long, linear, persistent.
Annual or short-lived perennial climbing or trailing herb, 30–135 cm long, often forming a tangled mass.
Pods 30–48 × 3–4 mm, linear, glabrous or sparsely pubescent, beaked, 8–10-seeded.
Stems glabrous or sparsely puberulous.
