Climber to 12 m. Tubers one per growing season, often with withering tuber of previous season, c. 5–20(–30) by 0.5–1.5 cm long, cylindric to clavate, vertically oriented. Indumentum usually present on all parts, simple hairs, 0.2–0.35 mm long, but often glabrescent to some degree. Stems 2.5–5 mm in diam., twining to the right, annual, toward base woody and spiny, unarmed on distal stems, terete. Leaves simple, opposite, sometimes subopposite or alternate towards base, blade usually ovate to very broadly ovate, sometimes ovate-oblong, chartaceous, 3–5-veined, margins entire, base obtuse to rounded, sometimes subcordate to cordate, apex acute to acuminate, obtuse or rarely retuse, forerunner tip horny and sometimes deflexed, deltoid to deltoid-acuminate; petioles 1.2–4.3 cm long, terete; cataphylls 4.5–7 by 3–5 mm, ovate; bulbils present in some races, 34–50 by 8.2–25 mm, clavate to globose or ovate. Inflorescences spicate, pendent, tepals inserted on a discoid torus; male inflorescences compound, 1–2 per axil, partial inflorescences 1–3(–5) per axil, peduncles 0.1–0. 4 cm long, axes 0.5–2.8 cm long; female inflorescences simple or compound, compound inflorescences 1 per axil, simple/partial inflorescences 1–2(– 3) per axil, peduncles 0.5– 1.2 cm long, axes 2.1–15(–25) cm long. Male flowers with tepals ovate to broadly so, outer 1.2–1.5 by 1–1.1 mm, ovate, inner 1.0–1.1 by 0.7–1 mm, ovate to broadly ovate; stamens 3, staminodes 3. Capsules 15–17 by 21–27 mm. Seeds 3–3.5 by 3.5–4.5 mm, rounded-lenticular to ovoid-lenticular, wing 13–14.5 by 11.5–12.5 mm, extending all around seed margin.