Plant size variable, generally smaller at higher elevations. Stems slender, spirally twisted, twining, terete. Petiole to 1.7 cm; leaf blade lanceolate to triangular-ovate, occasionally linear-lanceolate, 1.5-7 × 0.3-2.3 cm, base rounded to shallowly cordate, margin crenulate, apex long acuminate and caudate, veins 3. Flowers 1 or 2, axillary and terminal on an axillary peduncle; peduncle 0.5-2 cm; bracts leafy, triangular-ovate or scaly. Flowers sessile or pedicel to 3 mm. Calyx campanulate; tube 3-7 mm, wingless, expanded in fruit; lobes ascending, linear, 1-7 mm. Corolla light pink-purple, longitudinally purple striped outside, narrowly campanulate, 1.8-3.2 cm; lobes triangular, 2-3 mm; plicae suborbicular, 1-1.5 mm. Filaments 1.2-2 cm; anthers ellipsoid, ca. 0.8 mm. Disc 1-1.5 mm. Ovary 6-12 mm; gynophore 2-4 mm. Style 1-1.2 cm. Berries red-purple, subglobose, 0.7-1.6 × 0.7-1.2 cm. Seeds brown, triquetrous, wingless. Fl. and fr. Sep-Mar.
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