Herbs twining. Stems terete, striate, glabrous. Petiole ca. 1 cm, glabrous; leaf blade deltate-cordate, 0.5-3 × 0.5-2 cm, papery, both surfaces glabrous, veins palmate, 2 pairs from base, base auriculate, sinus to 1.5 cm deep, apex acute. Flowers in axils of leafy shoots, solitary. Peduncle ascending, ca. 1 cm, glabrous; bractlets subulate, 1-2 × ca. 1 mm, inserted near base of peduncle. Calyx yellowish green; tube rectilinear or slightly curved, abaxially glabrous; utricle globose, ca. 5 mm in diam., sessile; tube ca. 5 × 2.5 mm; limb unilateral, lanceolate, ca. 1.2 × 0.3 cm, apex long acuminate or shortly tailed. Anthers elliptic, 0.3-0.4 mm. Gynostemium 6-lobed. Capsule ellipsoid, 1.5-2 × 1-1.2 cm, dehiscing acropetally. Seeds ovoid-cordiform, ca. 4 × 3 mm. Fl. May, fr. Oct-Dec.
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