Slender vine; stems to 1.5 m long, glabrous. Leaves: pseudo-stipules absent; petiole 0.5–5.5 cm long; lamina narrowly sagittate or sagittate to ovate-sagittate, 1.2–11.5 cm long, 0.5–5 cm wide, glabrous above, sparsely puberulent or glabrous below; base sagittate or shallowly to deeply cordate; apex acute to blunt. Flowers solitary; pedicels 0.1–0.5 cm long. Calyx straight or curved, creamish or greyish mottled maroon or purplish brown, glabrous outside; utricle subglobose, 0.3–0.7 cm long; tube 6–14 mm long; limb 1-lobed, linguiform, 0.9–2.2 cm long, 0.2–0.3 cm wide; apex obtuse, mucronate to emarginate. Fruit globose to obloid, 1–2 cm long, 1–1.6 cm diam., not beaked. Seed cordate-triangular, concave-convex, 3–5.5 mm long, 3–5 mm wide, 1–1.5 mm thick, verrucose on both surfaces, not winged.
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