Stems spirally twisted, twining, slender, terete, striate. Petiole 0.5-1.5 cm, slender; leaf blade lanceolate, occasionally narrowly ovate, 3-8.5 × 0.6-3 cm, base rounded to subcordate, margin entire or crenulate, apex acuminate; veins 3. Inflorescences 1-flowered or cymes; bracts usually 1(-4) pairs, to 1 cm. Pedicel 0.2-1.5 cm. Calyx campanulate; tube (5-)7-12 mm, narrowly winged; lobes linear to linear-lanceolate, 5-14 mm, apex acuminate. Corolla white, pale yellow, pink, blue, or dark purple, narrowly campanulate, (2.5-)3-5 cm; lobes triangular, 4-5 mm, apex acuminate to acute; plicae semiorbicular, 1.5-2 mm, margin crenulate to erose. Filaments linear-subulate to linear, 1.5-2.2 cm; anthers ellipsoid, ca. 1 mm. Disc 1-1.2 mm. Ovary 0.8-1.5 cm; gynophore (0.3-)0.5-1.5 cm. Style 1-1.5 cm. Berries fusiform to ellipsoid, exserted from corolla. Fl. and fr. Aug-Dec.
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