Stems 30-60 cm or more, brown spotted, glabrous, simple, with 3-5 nodes. Petiole 1-3 cm; leaf blade broadly elliptic to obovate, 8-24 X 4-11 cm, glabrous, base sometimes oblique, broadly to narrowly cuneate, margin entire, apex acute, short vermiform sclereids surrounding vascular bundles; lateral veins 4-6 on each side of midrib. Cymes 5-7-flowered; peduncle 1-1.5 cm, glabrous; involucre 2.5-3 cm in diam., outside glabrous. Calyx 2-2.5 cm, 5-lobed from above middle; lobes equal, triangular-ovate, 7-10 X 8-10 mm, outside and margin glabrous. Corolla outside white, inside pale yellow with purple spots, ca. 4.5 cm, outside sparsely glandular puberulent, inside with a ring of hairs; tube ca. 3.5 cm; adaxial lip ca. 8 mm; abaxial lip ca. 1 cm. Anthers ca. 4 mm; staminodes 2, ca. 8 mm. Pistil ca. 2.5 cm, glabrous. Capsule 2-2.5 cm. Fl. Aug, fr. Sep-Oct.
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