Stems twining, stout, terete, internodes 10-20 cm. Petiole 1-3 cm, slender; leaf blade elliptic, ovate, or broadly ovate, 5-10 × 2-5 cm, leathery, base rounded to truncate, margin crenulate, apex acuminate and caudate. Inflorescences 2flowered or cymes. Pedicel 2-9 cm; bractlets absent, rarely 1-3 pairs and foliose. Calyx tubular; tube 1.2-1.7 cm, entire, rarely split on 1 side, apex with intracalycular membranes; lobes erect, ovate, 5-10 × 5-6 mm, base connate into a cupular limb. Corolla blue to purple, campanulate, 4-5 cm; lobes ovate, 4-6 × ca. 5 mm, apex acute; plicae semiorbicular to truncate, ca. 1 × 3-4 mm, margin erose. Stamens inserted just below middle of corolla tube; filaments linear-subulate, ca. 1.5 cm; anthers sagittate, 3-4 mm. Nectaries ovate. Style short, linear, ca. 6 mm including stigma lobes; stigma lobes linear. Capsules ellipsoid to obovoid, compressed, 2-3 cm, included in corolla to slightly exserted; gynophore 2-2.5 cm. Seeds dark brown, discoid, ca. 2 mm in diam., broadly winged. Fl. and fr. Oct-Dec.
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