Stems 15-38 cm, sparsely purple-brown spotted, glabrous, simple, with 3-5 nodes. Petiole 0.4-3.8 cm; leaf blade usually oblique, elliptic to ovate, 4.5-12 X 2.5-6 cm, adaxially pubescent, abaxially glabrous to sparsely pubescent, base usually unequal, cuneate to rounded, margin conspicuously serrate to nearly entire, apex acute to acuminate, vermiform sclereids surrounding vascular bundles; lateral veins 5-10 on each side of midrib. Cymes 1-5-flowered; peduncle 5-12(-30) mm, glabrous; involucre 0.5-1 cm, outside glabrous. Calyx 5-sect from base; segments equal, lanceolate, 1.1-1.4 cm X 4-5 mm, outside and margin sparsely glandular puberulent. Corolla outside white, inside purple spotted, 3.7-4.4 cm, outside sparsely glandular puberulent, inside with a ring of hairs; tube 2.5-3 cm; adaxial lip 9-10 mm; abaxial lip 1.2-1.4 cm. Anthers ca. 2 mm; staminodes 2, ca. 7 mm. Pistil ca. 2 cm; ovary glabrous. Style sparsely glandular puberulent. Capsule ca. 3.5 cm. Fl. Sep-Oct, fr. Nov-Dec.
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