Stems twining, terete, 2-3 mm in diam. Petiole 5-10 mm, slender; leaf blade lanceolate to ovate-lanceolate, 6-7 × 1-2.5 cm, base rounded, margin entire or sometimes slightly revolute, apex acuminate to sometimes caudate, veins 3. Inflorescences 1-3flowered cymes; bracts 1-3 pairs, ovate, to 1 cm. Pedicel 3-10 mm. Calyx campanulate; tube 1-1.4 cm, broadly winged; lobes linear-lanceolate, 5-6 mm. Corolla blue, narrowly campanulate, 3.5-4 cm; lobes ovate-triangular, 5-6 mm, apex acuminate and caudate; plicae semiorbicular, 1.5-2 mm, margin entire or crenulate. Filaments linear, 1.8-2 cm; anthers ellipsoid, ca. 1.5 mm. Disc ca. 1 mm. Style 8-10 mm. Capsules ellipsoid to obovoid-ellipsoid, ca. 3 cm, included in persistent corolla; gynophore less than 5 mm. Seeds light brown, discoid to compressed triquetrous, 2-2.5 mm, broadly winged along ridges. Fl. and fr. Sep-Oct.
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