Stems 12-40 cm, often sparsely brown spotted, densely brown puberulent to villous, simple, with 3-6 nodes. Petiole 2-11 cm; leaf blade elliptic to ovate, 7-21 X 4-14 cm, pubescent to densely so, base slightly unequal, cuneate to attenuate, margin entire to weakly serrate toward apex, apex acute to acuminate, without sclereids; lateral veins 5-8 on each side of midrib. Cymes 2-7(-21)-flowered; peduncle 0.4-5.5(-10) cm, sparsely glandular puberulent to pilose; involucre 1-2.5 cm in diam., outside sparsely glandular puberulent. Calyx 5-sect from base; segments equal, linear, 5-9 X 2.5-3 mm, outside and margin sparsely glandular puberulent. Corolla outside white, inside purple spotted, 3-3.4 cm, outside sparsely glandular puberulent, inside glabrous; tube 2.3-2.5 cm; adaxial lip 4-5 mm; abaxial lip 7-9 mm. Anthers ca. 3.2 mm; staminodes 2, 6-8 mm. Pistil 1.8-2.3 cm, sparsely glandular puberulent. Capsule 1.6-2.2 cm. Fl. Aug-Oct, fr. Sep-Nov.
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