Roots unknown. Stems twining, more than 1 m, glabrous, branched. Leaves alternate; petiole 0.5-2 cm, puberulent; blade ovate to lanceolate, 2-10 × 1-6 cm, abaxially densely pubescent, adaxially hispidulous, base cordate to rounded, margin minutely serrate or subentire, apex acute to acuminate. Flowers axillary, almost opposite to leaves, forming cymes; pedicels 2.5-7 cm, glabrous at lower and middle part, pubescent at top. Calyx adnate to ovary up to middle part; tube semiglobose, 10-ribbed, glabrous or sparsely pubescent; lobes linear to linear-lanceolate, 10-20 × 2-3 mm, both sides hispidulous entirely or only above, with 1 or 2 verrucose denticles on each side, sinus between calyx lobes broad and truncate. Corolla pale greenish white, flushed and spotted crimson, purple inside, or tube white, lobes deep purple, campanulate, 2-3.2 × 2-3 cm, pubescent less frequently, outside glabrous, lobed to 1/3; lobes deltoid, sometimes recurved. Filaments slightly dilated at base, ca. 6 mm, glabrous; anthers as long as filaments, glabrous. Capsules globose in inferior part, conical in superior part, 1-2 × 1.2-1.6 cm. Seeds brownish yellow, oblong, ca. 0.7 mm. Fl. Sep-Nov, fr. Oct-Nov.
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