Stems spirally twisted, twining, terete, striate, glabrous or sometimes hirsute along striae. Petiole 0.5-1.5(-2) cm, slender, scabrous; leaf blade lanceolate, ovate-lanceolate, or ovate, 4-9 × 1-2.5(-3) cm, base rounded to cordate, margin crenulate, apex acuminate and sometimes caudate, veins 3-5. Inflorescences 1-6-flowered cymes; bracts 1-3 pairs, lanceolate to ovate, 0.5-2 cm. Pedicel 2-5 mm, hirsute. Calyx cylindric; tube 1-1.4 cm, wingless or narrowly winged, with puberulent and/or scabrous-ciliate ridges; lobes linear-lanceolate, 3-5(-9) mm, apex acuminate. Corolla pale purple to blue, campanulate, 4-5 cm; lobes ovate-triangular, 5-6 mm, apex acuminate; plicae semiorbicular, 1.5-2 mm, margin crenulate. Filaments linear, 1.8-2 cm; anthers ellipsoid, 2-3 mm. Disc ca. 1.5 mm. Ovary subsessile, ca. 1.3 cm. Style linear, 1.8-2 cm. Berries purple, subsessile, fusiform, 1.4-2 cm, included in withered corolla. Seeds ellipsoid, discoid, wingless. Fl. and fr. Aug-Nov.
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