Climber of variable habit to at least 25 m. Tubers solitary, c. 10–20 by 5– 15 cm, variable in shape, usually globose to cylindric, sometimes digitate or irregularly lobed, shallowly buried, annually replaced, sometimes absent. Indumentum absent. Stems 15–20 mm in diam. toward base, twining to the left, annual, unarmed, terete but with a longitudinal groove in some herbarium specimens. Leaves simple, alternate, blade broadly ovate to orbicular, thinly chartaceous, 5–9(–11)-veined, margins entire or slightly undulate, base cordate, sometimes subcordate to rounded, apex acuminate; petioles 5–12 cm long, often with undulate margin; lateral nodal flanges present as a pair of membranous semicircular projections to c. 5 mm in diam. which clasp stem, margins sometimes erose; cataphylls absent; bulbils abundant, 0.2–12 cm in diam., usually globose to ovoid, sometimes cylindric, epidermis smooth to tuberculate or pitted. Inflorescences spicate, pendent, axes terete, flowers turned towards inflorescence apex; male inflorescences usually compound, 1–2 per axil, simple/partial inflorescences (1–)2–6 (–12) per axil, peduncles 0.3–0.8 cm long, axes 2.5–8 cm long; female inflorescences simple, (1–)2–6 per axil. Male flower colour (often preserved in dried specimens) turning from green or pale green to white-yellow or cream, then purple to reddish-brown, outer tepals 1.4–2.8 by 0.5–1.1 mm, lanceolate to elliptic-oblong, inner tepals 1.4–2.8 by 0.4–0.7 mm, narrowly oblong to narrowly oblong-elliptic or lorate, stamens 6. Capsules 25–50 by 10–12 mm. Seeds 3–5 by 2.3–4 mm, ovoid to ellipsoid with a small apical projection, wing extending from seed base, 12–16 by 5–6 mm, oblong to narrowly elliptic.