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Leaf blade 2–18.5 × 1–14 cm, triangular-ovate, acute at the apex, coarsely serrate or biserrate on the margins, deeply or widely cordate at the base, chartaceous, 5–7-nerved from the base, sparingly pubescent and setose on upper surface, whitish-tomentose and setose along the midrib and main nerves beneath; lateral nerves in 3–5 pairs, scarcely prominent above, slightly so beneath, camptodromous or craspedodromous.
Inflorescences up to 11 cm long, on peduncles up to 3 cm long, leaf-opposed, mostly male with 1(2) female flowers at the base; axis tomentellous; male bracts 2–3 mm long, linear, 1-flowered; male bracteoles 1–2 mm long, subulate; female bracts and bracteoles resembling those of the male, but slightly larger.
Male flowers: pedicels 2 mm long; buds turbinate; calyx lobes 1.5 × 1 mm, elliptic-ovate, obtuse, sparingly puberulous without, glabrous within; stamens 1 mm long; pistillode flat, 3-lobed, the lobes truncate at the apex.
Climber. Leaves triangular-ovate, 20-120(-160) x 10-90(-120) mm, acute, coarsely serrate, greyish tomen-tose, venation prominent beneath. Stinging hairs virulent. Flowers green.
Seeds 3 mm in diameter, globose, greyish-brown, unevenly finely dark brown-granulate and with scattered patches of minute whitish papillae.
A climbing branched severely urticating perennial herb or shrub, up to 9 m tall when supported, monoecious.
Stems and petioles tomentellous, or retrorsely puberulous and hispid and sometimes stinging-setose.
Fruit 4–5 × 7–8 mm, 3-lobed, smooth, puberulous and setose.
Stipules 5–6 mm long, linear-lanceolate.
Petiole up to 13.5 cm long.
