Slender twining vine, dying back to perennial rootstock; stems to 1 m long, sparsely to moderately pubescent or rarely glabrous. Leaves caducous: pseudo-stipules absent; petiole 0.5–1.6 cm long; lamina of lower leaves broadly triangular, 2–4.5 cm long, 1.8–3.2 cm wide, upper leaves linear-lanceolate to linear, 3.2–16.5 cm long, (0.2–) 0.5–1.5 cm wide, sparsely to moderately pubescent on both surfaces; base sagittate-auriculate; apex acute to attenuate. Flowers solitary; pedicels 0.2–0.3 cm long. Calyx straight to geniculate, greenish with reddish purple veins and limb, mostly glabrous outside; utricle subglobose, 0.6–0.8 cm long; tube 10–15 mm long; limb 1-lobed, oblong, 1.5–3 cm long, 0.3–0.4 cm wide, apiculate. Fruit subglobose, 1.5–1.8 cm long, 1–1.2 cm diam., not beaked. Seed cordate-ovate, concave-convex, c. 4 mm long, c. 3 mm wide, c. 0.5 mm thick, verrucose on convex face, not winged.
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