Stems twining, stout, terete, striate, lower internodes 1-3 cm, upper internodes 5-10 cm. Lower stem leaves many pairs; leaf blade ovate, 1-3 × 1-2 cm. Upper leaves sessile or petiole to less than 5 mm; leaf blade lanceolate, 4-6 × ca. 1 cm, base rounded, apex acuminate and caudate, veins 3-5. Inflorescences 1 or 2flowered. Pedicel 1-4 cm, slender; bractlets sometimes present, lanceolate, ca. 10 × 1-3 mm. Calyx narrowly campanulate; tube (0.8-)1-1.2 cm, entire or less often split on 1 side; lobes linear-lanceolate, 2-6 mm, apex acute. Corolla pink, blue-purple, or purple, campanulate, 3-3.5 cm; lobes broadly triangular, 2-3 × ca. 4 mm, apex acute; plicae semiorbicular to truncate, ca. 1 × 2-3 mm, margin erose. Stamens inserted at middle of corolla tube; filaments linear-subulate, ca. 1 cm; anthers ellipsoid, 2-3 mm. Nectaries ovate. Style linear, ca. 5 mm including linear stigma lobes. Capsules brown, ellipsoid, compressed, 2-2.5 cm, included in corolla to exserted; gynophore 1.5-2 cm. Seeds brown, discoid, 2-2.5 mm in diam., broadly winged. Fl. and fr. Sep-Oct.
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