Dioecious, twining vine; stems stout, 4-winged, twining to the right, the wing extending onto petiole. Leaves opposite; petioles 5-14 cm long; blades ovate-cordate, acuminate, with a broad to narrow basal sinus, 10-21 cm long, 6-14 cm wide; glands small, dark, scattered; veins (7) 9-11(13), palmate. Staminate inflorescences in narrow axillary panicles 20-30 cm long; pistillate inflorescences stout simple spikes, solitary in axils, to 25 cm long; rachis glabrous; flowers yellow; tepals 6, very thickened, ca 3 mm long; style 3, the branches bifid. Capsules 3-winged, suborbicular or broader than long, smooth; seeds winged. Croat 11616.