Stems spirally twisted, twining, terete. Petiole 0.8-1.2 cm; leaf blade membranous, oblong-lanceolate to lanceolate, 4-9 × 1-2 cm, base rounded to cordate, margin crenulate, apex long acuminate, veins 3. Flowers 1 (or 2), usually terminal on an axillary peduncle 0.5-1.5 cm; bracts leafy, ovate to triangular, occasionally scaly. Pedicel 3-5 mm. Calyx campanulate; tube 7-10 mm, weakly winged; lobes straight, ascending in fruit, linear-lanceolate to lanceolate, 8-11 mm. Corolla rose-violet, narrowly campanulate, 3.6-4.2 cm; lobes widely triangular, ca. 3 mm; plicae semiorbicular, 1-1.5 mm, margin crenulate. Filaments 2-2.5 cm; anthers ellipsoid, ca. 1.5 mm. Disc 1.5-2 mm. Ovary subsessile, 1.8-2.5 cm. Style 1.2-1.7 cm. Berries red, subsessile, narrowly ellipsoid, 3-4.5 cm × ca. 7 mm. Seeds black, compressed, wingless. Fl. and fr. Aug-Jan.
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