Climber to 5 m. Tubers up to about six per plant at any one time, to 40 cm long, c. 0.5 cm in diam. at the apex and to c. 12 cm at the widest point, clavate to pyriform, each one annually replaced, subtended by a vertically oriented, ovoid woody crown. Indumentum absent. Stems1.5– 4 mm in diam., twining to the left, annual, unarmed, terete. Leaves simple, alternate, blades broadly to very broadly ovate, 5–7-veined, chartaceous, margins entire, base cordate, apex acute to acuminate; petioles 3.5–6.7 cm long; cataphylls, bulbils and lateral nodal organs absent. Inflorescences pendent, tepals inserted on a cup-shaped torus, fused at base; male inflorescences racemose, simple, 1 per axil, peduncles 10–18 mm long, axes 4.6–15.7 cm long; female inflorescences and female flowers not seen. Male flowers 2.7–3.3 mm in diam. at anthesis, pedicels 0.5–0.8 mm long, tepals free, inserted on the rim of a goblet-shaped torus c. 1/2 to 2/3rds of their length deep, outer tepals 2.6–2.8 by 1.0–1.1 mm, ovate to elliptic, inner tepals (Fig. 51J) 2.5–2.8 by 0.7–0.8 mm, narrowly obovate to spathulate, stamens 6, filaments erect to apically incurved. Infructescences 2.2–3.3 cm long, usually 1–2(– 5) capsules developing, capsules 22–26 by 39–46 mm. Seeds 4.0–5.5 by 5–7 mm, lenticular-ovoid, wing 20–21 by 18–20 mm, extending all around seed margin.