Slender to robust vine; stems to 20 m long; young branches retrorsely pubescent, glabrescent. Leaves: petiole 0.7–2.5 (–4.5) cm long; lamina oblong-ovate or oblong-triangular to slightly lyrate-oblong, 3–18.5 (–25) cm long, 1.3–7.5 (–15) cm wide, glabrous above, puberulent to pubescent with straight and hooked hairs below; base cordate; apex acuminate or sometimes acute. Flowers leaf-opposed, solitary or in long axillary racemes. Calyx pinkish or mauve with purplish veins or streaks, pubescent outside; utricle 9–11 mm long; tube 13–16 mm long; lobes erect, folded, broadly obtuse, 7–10 mm long, dark maroon on revolute margin, with marginal fringe of white hairs; apex obtuse. Fruit obloid, 3–7.5 cm long, 2–3 cm diam. Seed triangular to heart-shaped, 5.5–7 mm long, 5–8 mm diam., 0.5–1 mm thick, flat; surface minutely textured.
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