Liane. Stems herbaceous, ribbed, glabrous or pubescent, climbing to 15 m. or more, perennial, becoming thickened when old. Leaves petiolate, 3–5-foliolate; median leaflet elliptic, acuminate, acute, tapered into the petiolule, entire or shallowly sinuate-toothed, glabrous or sparsely hairy or punctate, 3-nerved from near the base with 2 well-developed ascending lateral nerves, 60–170 mm. long, 30–100 mm. broad; lateral leaflets similar; petiolules 2–20 mm. long; petiole 19–80 mm. long, pubescent like the petiolules. Probracts 5–8 mm. long. Male flowers in 100–300 mm. long racemes; bracts 2.5–8 mm. long, 1.5–3 mm. broad; pedicels 8–35 mm. long; receptacle-tube campanulate, 2.5–3.5 mm. long, densely glandular-hairy inside above; lobes triangular, glandular-dentate, 2–4 mm. long; petals ± 25 × 12 mm., white with dark purple mark at the base inside; stamens 3; anthers coherent in centre of flower. Female flowers stalked, details unknown. Fruit whitish when ripe, with yellowish flesh, ellipsoid, tapered at both ends, rather sharply 10-ribbed, up to ± 600 mm. long. Seeds many, very broadly and asymmetrically ovate in outline, 32–36 × 33–37 × 10–12 mm.; testa smooth, with the endocarpic fibrous sheath poorly developed or absent. Fig. 1/7, p. 14.