Tall liana or scandent shrub when young. Shoots and branchlets pubescent, glabrescent. Leaves: petiole 4–8 (–10) mm long; lamina lanceolate or narrowly ovate, 7–17 cm long, 2.5–6 cm wide, obtuse or rounded or sometimes acute at base, acute at apex, much paler on underside, sparsely puberulous, glabrescent; secondary veins 8–12 pairs. Flowers c. 4–5 cm diam., ± odourless. Pedicel 5.5–7.5 cm long, sparsely puberulous; bract 6.5–12 mm long, 4–5 mm wide. Sepals 3, ovate, 12–17 mm long, 9–10 mm wide, sparsely puberulous. Petals 3 + 3 in 2 whorls, sparsely puberulous, greenish yellow to yellow (often with a red base, fide Cooper & Cooper 2004: 21); outer petals ovate, 42–55 mm long, c. 27 mm wide; inner petals elliptic, 35–47 mm long, c. 18–20 mm wide, concave inside at base. Stamens c. 150, 1.5–2 mm long, anthers hooded. Carpels c. 100; ovary 1.5–1.8 mm long. Apocarps 3.5–6.5 cm long, c. 1 cm wide, constricted between each seed, black; stipe 5–9 mm long. Seeds 1–4 (–7), subglobular, 6.5–8 mm long, 5.5–6.5 mm wide.
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