Stems to 1 m, unspotted, glabrous, simple, nodes many. Petiole 1-5.5 cm; leaf blade ovate-lanceolate to elliptic-lanceolate, 9.5-12.5 X 4.4-5.6 cm, adaxially sparsely pubescent, abaxially glabrous, base broadly cuneate, margin repand-crenate, apex acuminate, vermiform sclereids surrounding vascular bundles; lateral veins 10-12 on each side of midrib. Cymes 6-9-flowered; peduncle 3-3.6 cm, glabrous; involucre ca. 1.7 cm in diam., outside glabrous. Calyx 5-sect from base; segments equal, linear-lanceolate, 1.9-2 cm X ca. 2.5 mm, outside and margin glabrous. Corolla outside white, ca. 3.4 cm, outside glabrous, inside with a ring of hairs; tube ca. 2.6 cm; adaxial lip ca. 6 mm; abaxial lip ca. 8 mm. Anthers ca. 2 mm; staminodes 3, 1.5-5.5 mm. Pistil ca. 2.2 cm, glabrous. Capsule unknown. Fl. Sep-Oct.
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