Strong climber to 12 m.; stems brownish-green, herbaceous, rough, angular. Leaf-blade broadly ovate- or reniform-cordate in outline, sinuate-toothed, often rather remotely so, deep glossy green, somewhat bullate with sunken nerves and minutely setose becoming scabrid-punctate above, grey-green with raised softly- to scabrid-hairy nerves beneath, 80–240 mm. long, 80–280 mm. broad, palmately 5-lobed; lobes triangular, ovate or lanceolate, broadest or slightly narrowed towards the base, apiculate; petioles hairy, channelled above, 45–122 mm. long. Tendrils bifid. Probracts glandular, 3–5 mm. long, 2–3 mm. broad, larger in the ♀ than in the ♂ plant. Male flowers solitary or in 2–4-flowered racemiform groups on a 20–60 mm. long peduncle, accompanied by a coaxillary longer-pedicelled solitary flower; pedicels 5–40 mm. long, those of the racemose flowers subtended by fleshy bracts 2–4 mm. long and 2–3 mm. broad; receptacle-tube broad and shallow, sulcate in lower half, 2–5 mm. long; lobes ovate-acuminate, 12–25 mm. long; corolla orange-buff with green veins, urceolate, densely glandular-hairy internally about the middle, with the lobes 48–62 mm. long, 14–21 mm. broad, united in lower half or two-thirds; stamens 3. Female flowers solitary, on 20–34 mm. long stalks; ovary hairy, 13–24 mm. long, 2.5–5 mm. across, 10-ribbed; receptacle-tube 3–4 mm. long; lobes narrow, 6.5–19 mm. long; corolla glandular as in ♂, with lobes ± 50–52 mm. long and 16 mm. broad, united in lower half or quarter. Fruit red, cylindrical, 92–99 mm. long, 26–28 mm. across, with the fruit-stalk broadened upwards.