Herbs 40-100 cm tall, erect. Stems terete, glabrous. Petiole 0.8-1.5 cm, minutely puberulent; leaf blade ovate-elliptic, 5.8-7.5 × 3-3.5 cm, glabrous except puberulent on margin and midvein, secondary veins 6 or 7 on each side of midvein, base rounded to constricted cuneate, apex attenuate. Inflorescences terminal, interrupted panicles composed of cymes, ca. 10 × 2 cm; rachis glabrous; bracts triangular, ca. 1.2 × 1 mm, glabrous. Calyx ca. 4.5 mm; lobes spatulate-oblanceolate, glabrous, apex acute. Corolla to 3.5 cm, outside glabrous, inside pubescent; tube basally cylindric for ca. 1/3 of its length then gradually widening into a funnel-shaped throat; lobes of lower lip 3-5 mm. Staminal filaments 4-6 mm, glabrous; anther thecae to 2.5 mm, ± equal or with lower theca smaller, ± parallel, slightly or not overlapping. Ovary glabrous; style glabrous. Capsule not seen. Fl. Aug-Sep.
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