Liane to 6 m.; older stems brown, glabrous, striate and slightly rugulose; young stems dark brown, puberulous, striate and lenticellate, hairy at the nodes.. Leaves 3-foliolate; petiole 3–11 cm. long, with a line of hairs above; petiolules slightly channelled, 0.7–2.5 cm. long; leaflets elliptic to ovate, 4.5–9.5 cm. long, 2.5–6 cm. wide, shortly to distinctly acuminate at the apex, rounded, subcordate or almost cuneate at the base, rather thick, shortly rather roughly pubescent above, chiefly on the midrib, sparsely pilose on the nerves beneath or more densely so on both surfaces, even ± velvety beneath; lateral nerves 3–5 on each side.. Inflorescences probably 15–20-flowered; buds ellipsoid, 3–6.5 mm. long.. Flowers greenish white.. Outer tepals 5–11 mm. long, 5-nerved, pubescent outside; inner slightly shorter, 1-nerved, almost glabrous.. Filament-appendages urceolate, up to 3 mm. long, shortly stipitate, the margins laciniate; inter-staminal glands minute; connectives papillose.. Stigma 3–5-lobed.. Fruit-body 0.8–1.3 cm. long, 7–8 mm. wide, (2–)3–4-winged; wings broadly rounded, the larger pair 3.5–4 cm. long, 3 cm. wide, the smaller 1.3–2.5 cm. long, 0.5–1.2 cm. wide.. Seed depressed ovoid, 6.5 mm. long, 5.5 mm. wide, the margin keeled and faces yellow glandular.. Fig. 2/10–15.
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