Stems spirally twisted and twining, nearly 4angled. Petiole 0.5-1.5 cm; leaf blade lanceolate to ovate, 4-9 × 1.5-4 cm, base rounded to shallowly cordate, margin not revolute, apex acuminate to acute; veins 3-5, abaxially distinct. Inflorescences clusters of 2-5 flowers; bracts scalelike or subulate. Pedicel 0-5 mm; bractlets 1 pair per flower, oblanceolate, 2-6 mm. Calyx narrowly campanulate; tube 0.7-1.3 cm, winged; lobes linear-subulate, arcuate spreading, 0.6-2 cm, apex acuminate to attenuate. Corolla greenish blue to pale purple, narrowly campanulate, 3.3-5 cm; lobes ovate-triangular, 7-9 mm, apex acuminate; plicae semiorbicular or triangular, 1-3 mm, margin entire or occasionally few toothed. Filaments 2-2.5 cm; anthers ellipsoid, 1.5-2 mm. Disc 1.5-3 mm. Ovary subsessile, 7-10 mm. Style 1.7-2 cm. Berries ellipsoid, 1.8-2.2 cm × 8-10 mm.
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