Climbing or scrambling, dioecious or monoecious perennial with tuberous woody rootstock; stems to c. 3 m long, glabrous, flexuous. Lvs all similar. Petioles slender, = or often > lamina. Lamina 3-8 × 2-6 cm, ± triangular or hastate with 2 long basal lobes at 45° to petiole, otherwise entire, slightly puberulent on main veins below when young; sinus broad and rounded; apex acuminate to cuspidate. Panicle pyramidal, with small lvs in the lower axils only. Pedicels filiform, long, glabrous. Perianth 1.5-2 mm long, green; outer segments ± ovate-oblong, becoming strongly reflexed in ♀ fls. Fr. valves (4)-6-9-(9.5) mm diam., orbicular, entire, prominently reticulate, cordate, yellow, pink to crimson; tubercles 0. Nuts c. 3 mm long, glossy light brown; keels almost winged.