Stems spirally twisted, twining, terete. Petiole 2-3 cm; leaf blade lanceolate, ovate-lanceolate, or ovate, 6-11 × 2.5-3.5 cm, base rounded to shallowly cordate, margin crenulate, apex acuminate, veins 3. Inflorescences 1-flowered or cymes; bracts 1-4 pairs, scalelike, narrowly lanceolate. Pedicel 2-3 mm. Calyx campanulate; tube 7-9 mm, winged; lobes lanceolate, 0.9-1.5 cm, widely keeled, apex acute to acuminate. Corolla yellowish white, narrowly campanulate, 3.5-4 cm; lobes triangular, 4-5 mm, apex acuminate; plicae obliquely triangular, 1-2.5 mm, margin crenulate. Filaments linear, 1-2 cm; anthers ellipsoid, 1-2 mm. Disc 1-1.5 mm. Ovary 7-9 mm; gynophore 2-3 mm. Style linear, 1.5-2.5 cm. Berries red-purple, subglobose, 1-1.8 × 0.8-1.1 cm, included in corolla; gynophore 1-3 mm. Seeds dark purple, ellipsoid to ovoid, discoid, 1.5-2 mm, wingless.
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