Climber to 6 m. Underground parts unknown. Indumentum absent except for simple hairs on very young shoots and a waxy pale green to white coating on leaf lower surfaces and immature capsules. Stems 1–3.5 mm in diam., twining to the right, annual, unarmed, terete. Leaves simple, opposite, blade narrowly lanceolate to lanceolate-oblong, thickly chartaceous to subcoriaceous, 3-veined, margins entire, base shallowly cordate to sagittate or auriculate, sometimes obtuse to rounded, apex acute to acuminate; petioles 0.7–4 cm long; cataphylls 4.5–5.2 by 2.7–3.1 mm, ovate to broadly ovate; lateral nodal organs and bulbils absent. Inflorescences spicate, pendent, tepals inserted on a discoid torus, free, fleshy in texture; male inflorescences simple or compound, compound inflorescences 1–2 per axil, simple/partial inflorescences 1–3(–5) per axil, peduncles 0.75–1.5 mm long, axes 0.5–2.8 cm long; female inflorescences simple, 1(–2) per axil. Male flowers with outer tepals 0.8–1 by 0.7–0.8 mm, ovate to broadly so, inner tepals 0.8–0.9 by 0.5–0.7 mm, obovate, stamens 6. Infructescences only 2–3 cm long, usually 1–3 capsules developing; capsules 13–15 by 19–23 mm. Seeds 3–5 by 2.8–4 mm, ovoid- to rounded-lenticular, wings 10–11 by 7–8 mm, extending all around seed margin.