Stems twining, terete, striate, internodes 10-13 cm. Petiole 1-2 cm; leaf blade ovate-lanceolate to ovate, 4-6 × 2-3 cm, leathery, base rounded, apex acuminate, veins 3-5. Inflorescences 2flowered or cymes. Pedicel 0.5-3.5 cm, slender. Calyx campanulate; tube 1.2-1.4 cm, membranous, split on 1 side; lobes lanceolate, ca. 6 × 1 mm, apex acute. Corolla pale purple to blue, campanulate, ca. 4 cm; lobes broadly triangular, 3-4 × 4-5 mm, apex acute; plicae semiorbicular to truncate, oblique, 3-4 mm wide, margin erose. Stamens inserted at middle of corolla tube; filaments linear-subulate, 1.2-1.5 cm; anthers sagittate, ca. 4 mm. Nectaries ovate. Ovary narrowly ellipsoid, 1-1.2 cm; gynophore ca. 1 cm. Style linear, ca. 7 mm including linear stigma lobes. Fl. Sep.
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