Plants glabrous throughout. Roots fusiform or carrot-shaped. Stems erect or sprawling, 30-50 cm, few branched. Leaves opposite or those at top sometimes alternate; petiole 1-7 mm; blade ovate or lanceolate, 4-9 × 1.6-3.5 cm, base rounded or obtuse, margin subentire or sinuous, apex acute or acuminate. Flowers terminal or opposite leaves at top. Calyx tube adnate to ovary for its entire length, broadly obconic, 6-10 × 15-18 mm; lobes triangular, 10-20 × 6-9 mm, margin entire, apex acute or acuminate. Corolla dark red-purple, broadly campanulate or funnelform-campanulate, 2-3.4 × 2.4-4 cm; lobes triangular, equaling tube. Filaments slightly dilated, ca. 6 mm; anthers ca. 5 mm. Capsules semiglobose below, conical above, 1.5-2 cm in diam.; valves 5-8 mm. Seeds numerous, yellow, oblong, ca. 2 × 1 mm, narrowly winged. Fl. and fr. Sep-Oct.
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