Slender twiner, dying back to perennial rootstock; stems to 2 m long, glabrous. Leaves: pseudo-stipules broadly cordate-ovate, 4.5–11 mm long, 4–10 mm wide, deciduous; petiole 1.5–5 cm long; lamina broadly ovate, 4–8 cm long, 4–8 cm wide, glabrous above or rarely puberulent, sparsely puberulent below or sometimes glabrous; base deeply cordate; apex abruptly acuminate to obtuse. Inflorescence a 2–4-flowered raceme; pedicels 0.2–1.5 cm long. Calyx straight or slightly curved, whitish with reddish limb, glabrous outside; utricle subglobose, 0.5–0.7 cm long; tube 15–17 mm long; limb 1-lobed, linguiform, 1.9–2.6 cm long, 0.5–0.7 cm wide, 3-dentate at apex. Fruit subglobose to shortly obloid, 1–2 cm long, 1–1.5 cm diam., not beaked. Seed cordate-ovate, slightly concave-convex, 4–5 mm long, 3.5–4.5 mm wide, 0.7–1 mm thick, verrucose on both surfaces, not winged.
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