Stems twining, terete, striate, internodes 5-8 cm. Leaves subsessile or petiole to ca. 3 mm; leaf blade lanceolate to ovate-lanceolate, ca. 6 × 1.5-2 cm, leathery, base rounded, apex acuminate, veins 3-5. Inflorescences 1-flowered or cymes. Pedicel 1-3.5 cm, slender; bractlets sometimes present, 1-3 pairs, lanceolate, to 5 mm. Calyx tubular; tube 1.3-1.5 cm, apex with a transparent intracalycular membrane, split on 1 side; lobes lanceolate, 2-3 × ca. 1 mm, apex acute. Corolla purple, campanulate, ca. 4 cm; lobes broadly triangular, ca. 3 × 4 mm, apex acute; plicae semiorbicular to truncate, oblique, ca. 1 × 3 mm, margin entire. Stamens inserted at basal part of corolla tube; filaments linear-subulate, 1.3-1.4 cm; anthers ellipsoid, ca. 2.5 mm. Nectaries ovate. Style linear, ca. 8 mm; stigma lobes linear. Capsules ovoid, compressed, exserted from corolla; gynophore linear, ca. 2 cm. Seeds brown, discoid, broadly winged. Fl. Sep.
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