Stems 16-60 cm, densely brown spotted, glabrous, simple or branched, with 7-15 nodes. Petiole 0.4-3.5 cm; leaf blade narrowly ovate to ovate or falcate, 5-12(-14) X 2-4.7 cm, glabrous, base slightly oblique, cuneate, margin nearly entire, apex acute to acuminate, vermiform sclereids surrounding vascular bundles; lateral veins 4-10 on each side of midrib. Cymes 2-7-flowered; peduncle 1-2 cm, glabrous; involucre 1.8-2.3 cm in diam., outside glabrous. Calyx 1.4-1.6 cm, 5-lobed from middle; lobes equal, elliptic to ovate-orbicular, 7-8 X 3-7 mm, outside and margin glabrous. Corolla outside pink, inside dark purple spotted, 3.8-4 cm, outside sparsely glandular puberulent, inside with a ring of hairs; tube 3-3.1 cm; adaxial lip 7-8 mm; abaxial lip ca. 9 mm. Anthers ca. 3 mm; staminodes 2, 4-5 mm. Pistil ca. 1.5 cm, glabrous. Capsule 1.8-2.4 cm. Fl. Sep-Oct, fr. Oct-Nov.
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