Stems weakly twisted, twining, terete. Petiole 1-3(-4.5) cm; leaf blade ovate-lanceolate, ovate, or cordate, (1.5-)3.5-12 × (1-)2-5 cm, leathery, abaxially sometimes purple, base rounded to cordate, margin entire, apex acuminate and usually caudate; veins 3-5, indistinct. Inflorescences 1-flowered or cymes; bracts 1-4 pairs, leafy, lanceolate, 3-10 mm. Pedicel 0.5-1.5 cm. Calyx campanulate; tube (0.5-)1-1.3 cm, winged; lobes ascending or recurved only near tip, linear-lanceolate, 0.7-1.6 cm, apex acuminate. Corolla purple, campanulate, 3.5-4 cm; lobes ovate-triangular, 4-6 mm, apex acute; plicae broadly triangular, 1.5-2 mm, margin crenulate. Filaments linear-subulate, 1.5-1.8 cm; anthers ellipsoid, 1-2 mm. Disc 1-2 mm. Style linear, 1.5-2 cm. Berries dark purple, narrowly ellipsoid, 2-3 cm × 7-8 mm; gynophore less than 5 mm. Seeds dark purple, ellipsoid to ovoid, discoid, 2-2.5 mm, wingless. Fl. and fr. Aug-Dec.
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