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Male flower: 12–15 × 2–4(5) mm. (incl. the 2–3 mm. long stipe), campanulate; hypanthium 1–1·5 × 2–4(5) mm., shallowly cup-shaped; calyx-tube 0; sepals 8·5–13 × 2–3 mm., lanceolate, obtuse, subentire at the margin, remotely punctate; petals 8–13 × 2–3·5 mm., lanceolate, obtuse, 3–5-nerved, serrulate in the upper 1/2, sparsely punctate; corona 0 or a low ring c. 0·1 mm. wide; stamen-filaments 2–3 mm. long, connate at the base for 1–2 mm., inserted at the base of the hypanthium; anthers 4·5–5 × 1(1·5) mm., obtuse; disk-glands 0; vestigal ovary, incl. the gynophore, 1–1·5 mm. long.
Female flower: c. 10 × 4 mm. (incl. the c. 0·5 mm. long stipe), campanulate; hypanthium c. 1 mm. long, saucer-shaped; calyx-tube 0; sepals 8–9 ×3 mm., lanceolate, subobtuse, subentire; petals c. 3·5 × 0·33 0·5 mm., linear, subacute, 1-nerved, entire; corona 0; staminodes c. 0·5 mm. long, free; disk-glands 0; pistil 7–7·5 mm. long; gynophore c. 0·5 mm. long; ovary c. 5·5 × 3 mm., ellipsoid; style 0–0·5 mm. long, with stigmas c. 1·5 mm. in diameter, reniform, with papillate margins.
Leaf-lamina 4–12 × 3·5–10 cm., orbicular to ovate, obtuse to acute at the apex, margin entire or rarely with lobes up to 7·5 mm, deep, cordate at the base, chartaceous, brownish-green above, greyish-glaucous and sometimes punctate beneath, with 3(5) main nerves from the base and with 1(2) pairs of nerves from the midrib ascending towards the apex, distinctly reticulate; petiole 1·5–11 cm. long.
Cymes in the axils of normal leaves or sometimes in the axils of ± reduced leaves borne on short shoots up to 10 cm. long; peduncles 0·25–5 cm. long, up to 15-flowered in male and 1–3-flowered in female; tendrils 0 or 1,1–2 cm. long; bracts and bracteoles 0·5–1· mm. long, narrowly triangular, acute, serrulate; pedicels 0·5–5(12) mm. long in male, 0·5–4 mm. in female.
Gland at the lamina-base single, 1–2 mm. in diameter, on a spathulate median appendage 1·5–2·5 mm. long; lamina-glands (0)2–4, 0·5–1 mm. in diameter, near the axils of the upper lateral nerves; marginal glands c. 0·25 mm. in diameter, up to 6 on each side.
Capsule 4(4·5) × 2–2·5 cm., ovate-oblong or subfusiform, with smooth coriaceous pericarp, c. 30-seeded.
Seeds c. 4–5 × 2·5 × 2 mm., ± ellipsoid, pitted.
Stipules 0·5–1 mm. long, reniform, lacerate.
Sterile tendrils 10–25 cm. long, simple.
Subligneous climber up to 20 m.
