Woody climber, up to 10 m long; young stems glabrous or pubescent, terete; older stems 4-angled or winged, the wings often becoming corky and up to 2.5 cm wide. Leaves thick and fleshy, glaucous, usually sparsely pubescent; petiole 2–40 mm long; blade broadly ovate to suborbicular, 2–13 cm long and wide, ± cordate at the base, rounded at the apex, with crenate or dentate margins. Flowers produced with the leaves, in 2.5–25 cm long inflorescences; peduncle 1–3.5 cm long; pedicels 3–7 mm long, elongating up to 15 mm in fruit. Calyx c. 1 mm long, glabrous. Petals green, yellowish or whitish, 3–3.5 mm long, glabrous. Fruits ellipsoid, 11–15 x 7–13 mm, reddish. Seed ellipsoid, compressed, 8–10 x 5–6 mm, with dorsal ridge but otherwise smooth.