Stems spirally twisted, twining, slender, terete, striate. Petiole 0.5-1.5 cm, slender; leaf blade ovate-lanceolate, 6-9 × 2-2.5 cm, base rounded to subcordate, margin subentire to sometimes crenulate, apex acuminate and caudate, veins 3-5. Inflorescences 1 or 2flowered; bracts sometimes present, lanceolate, 1-2 cm. Pedicel 5-8 mm. Calyx campanulate; tube 6-9(-11) mm, broadly winged; lobes lanceolate, 0.7-1.3 cm, apex acuminate. Corolla white, narrowly campanulate, 2.5-3 cm; lobes ovate-triangular, ca. 4 mm, apex acute; plicae semiorbicular, ca. 2 mm, margin crenulate. Filaments linear, 1.2-1.5 cm; anthers ellipsoid, ca. 1 mm. Disc ca. 1 mm. Ovary 7-12 mm; gynophore ca. 6-10 mm at anthesis. Style linear, 6-9 mm. Berries red to dark purple, narrowly ellipsoid, (1.5-)2-4 cm; gynophore 1-2 cm. Seeds dark purple, elliptic, triquetrous, compressed, ca. 2 mm, distinctly winged. Fl. and fr. Aug-Sep.
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