Stems twining, terete, striate, lower internodes 2-4 cm, upper internodes 5-13 cm. Stem leaves larger toward apex; lowermost leaves sessile, ovate, 1-1.5 cm, abaxially hirsute; middle leaves subsessile, ovate, 3-6 × 1-3.5 cm, leathery, base rounded, apex acuminate to acute; upper leaves short petiolate, lanceolate to ovate-lanceolate, 5-7 × 1-1.5 cm, abaxially papillate along veins, base rounded, margin crenulate, apex acuminate, veins 3-5. Inflorescences 1-flowered, rarely cymes. Pedicel 1-10 cm, slender. Calyx sometimes pale purple, tubular, 1.5-2 cm; tube apex with a transparent intracalycular membrane, entire or less often split on 1 side, usually densely hirsute along veins; lobes ovate-triangular to triangular, 3-9 × 2-5 mm, apex acute. Corolla purple, funnelform, ca. 5 cm; lobes broadly triangular, ca. 3 × 4 mm, apex acute; plicae semiorbicular to truncate, oblique, 3-4 × ca. 1 mm, margin erose. Stamens inserted at middle of corolla tube; filaments linear-subulate, 1.2-1.5 cm; anthers ellipsoid, 4-5 mm. Nectaries narrowly ovate. Style linear, ca. 4 mm; stigma lobes linear. Capsules ellipsoid, compressed, 2-3 × 1-1.5 cm, exserted from corolla; gynophore 3-4 cm. Seeds brown, discoid, ca. 3 mm in diam., broadly winged. Fl. and fr. Sep-Oct.
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