Stems more than 20 cm, sparsely purple spotted, glabrous, branched or simple, with few to many sometimes swollen nodes. Petiole 1.4-4.5 cm; leaf blade narrowly to broadly ovate, 9.5-12.5 X 4.4-5.1 cm, adaxially pubescent, abaxially glabrous, base sometimes slightly unequal, rounded to cuneate, margin entire, apex acute to slightly acuminate, vermiform sclereids surrounding vascular bundles; lateral veins 8-11 on each side of midrib. Cymes ca. 6-flowered; peduncle 1.5-2.1(-4) cm, glabrous; complete involucre unknown, outside sparsely pubescent. Calyx 5-sect from base; segments equal, narrowly lanceolate, 1.3-14 cm X ca. 2.5 mm, outside and margin glandular puberulent. Corolla outside white, inside purple spotted, ca. 2.1 cm, outside glandular puberulent, inside with a ring of hairs; tube ca. 1.5 cm; adaxial lip ca. 5 mm; abaxial lip ca. 6 mm. Anthers ca. 2.5 mm; staminodes 2, ca. 6 mm. Pistil ca. 2 cm; ovary glabrous. Style sparsely glandular. Capsule ca. 1.9 cm. Fl. Sep-Oct, fr. Oct-Nov.
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