Variable climber to at least 20 m in dense forest, often much smaller. Tubers 2–3(–5), usually one or two per growing season plus withering tuber(s) from previous season, c. 14–20 by 5–8.5 cm, variable in shape but usually cylindric to clavate, sometimes lobed according to Prain & Burkill (1936), vertically oriented, subtended by woody crown. Indumentum present on all parts except tepals of male flower and inner whorl tepals of female flower, hairs simple, 0.05–0.3 mm long, dense on young shoots and inflorescences. Stems 2–5 mm in diam., twining to the left, annual, terete, towards base woody and densely prickly, prickles lax on upper stem. Leaves 3–5(–7)-foliolate, rarely simple on reproductive shoots, alternate, leaflet blades narrowly obovate to oblanceolate, each with a single main vein (prominent below) and secondary veins which do not anastomose to form a submarginal “collecting vein”, chartaceous, margins entire, base cuneate to narrowly cuneate, apex rounded to acuminate with a filiform to narrowly deltoid forerunner tip, lateral leaflet blades usually asymmetric; petioles 3.2–15.5 cm long, sometimes with prickles, petiolules 1.6– 1.8 mm long; cataphylls and lateral nodal organs absent; bulbils 3–30 mm in diam., globose to ovoid, pitted or tuberculate. Inflorescences pendent, tepals inserted on discoidgibbous torus, free, fleshy in texture, especially in female flowers; male inflorescences racemose, compound, 1–2 per axil, partial inflorescences 1–2(– 3) per axil, peduncles 1.4–3 mm long, axes 0.8–3.2 cm long; female inflorescences spicate, simple, 1–3(–5) per axil. Male flowers very strongly fragrant, apically conical in bud and only appearing to open at the apex, pedicels 0.2–0.8 mm long, outer tepals 1–1.5 by 0.8–1.1 mm, ovate, inner tepals 1–1.5 by 1.0–1.1 mm, obovate, thickened along dorsal midrib; stamens 3, filaments 0.25–0.4 mm long, staminodes 3. Capsules 11– 21 by 8.5–12.5 mm. Seeds 3–4.5 by 3.5–4 mm, lenticular-ovoid with a small apical projection; wing 7–11 by 3.5–5 mm, extending from seed base, oblong.