Climber to 0.5–1(–1.5) m. Tubers one per growing season, often with withering tuber of previous season, 14–16 by 1–1.5 cm, cylindric, vertically oriented, subtended by a small crown. Indumentum absent. Stems 1.5–2 mm in diam., twining to the left, annual, small prickles occasionally present towards base, otherwise unarmed, terete. Leaves simple, alternate, blades narrowly to broadly ovate or subdeltoid, 5–7-veined, chartaceous, margins entire, base subcordate to cordate, apex acuminate; petioles 1.1–4.6 cm long; cataphylls 5.5–6.5 by 2.2–2.7 mm, ovate; bulbils and lateral nodal organs absent. Inflorescences pendent, tepals inserted on discoid torus, fused at the base, erect, thinly chartaceous, with scattered small, narrowly oblong brown cystoliths visible; male inflorescences simple, 1–2 per axil, racemose with cymules of (1–)2–3 flowers on a short branch at each node, peduncles 1–4.2 cm long, axes 2.5–10 cm long, often weakly flexuous; female inflorescences spicate, simple, 1 per axil. Male flowers 1.6–3.3 mm in diam. at anthesis, (sub)sessile, outer tepals 2.3–3.1 by 1.3–1.9 mm, narrowly obovate, inner tepals 2.2–3.1 by 1.2–1.9 mm, obovate, stamens 6. Capsules 21–26 by 14–18.5 mm. Seeds 3.2–4 by 2–3 mm, ovoid-lenticular, wing 4.5–5.5 by 3.5–4.5 mm, obovate to oblong, extending from seed apex, a small basal wing sometimes also present.