Scandent to 20 m. or more, stems becoming woody when old, arising from flattened tuberous rootstock up to 150 cm. across. Leaf-lamina 2–8 × 2–8 cm., ovate to broadly ovate in outline, cordate, subsucculent, glabrous, unlobed or palmately 3–5–7-lobed; lobes triangular, obtuse, apiculate, the central largest, ± acuminate, sometimes acute. Petiole 1–4 cm. long, glabrous. male flowers 2–7 in corymbiform axillary fascicles; peduncles c. 2 mm. long, obsolescent; pedicels 5–30 mm. long. Receptacle-tube 0·5–1 mm. long; lobes 2–3 mm. long, ovate, obtuse to rounded. Petals 4–7 mm. long, brownish, unequal, 2 rather larger and darker, 3 smaller and paler; anther-connective slightly produced beyond the thecae but not obviously appendaged. female flowers 1–2, axillary; pedicels 1–2 cm. long; ovary c. 15 × 2–2·5 mm. Fruit 4·3–6·5 × 1·4–2·2 cm., cylindric-obconic, smooth, glabrous, obscurely veined. Seeds with compressed verrucose linear-oblong body and broad wing, 29–55 mm. long; body 16–25 × 4–7 mm.; wing 15–30 × 7–14 mm.
