Subshrubs or shrubs, to 3 m tall. Stems blackish brown, subterete, pubescent. Petiole 1-4 cm, puberulent; leaf blade ovate-elliptic to oblong-lanceolate, 5-15 × 3-5.5 cm, abaxially light green and pubescent along veins, adaxially slightly pubescent, secondary veins ca. 7 on each side of midvein, base cuneate to broadly cuneate, margin entire, apex acute to acuminate. Thyrses 3-10 cm, densely flowered; bracts triangular, ca. 7 × 3 mm, brown tomentose; bracteoles subulate, 3-4 × ca. 1.5 mm, brown tomentose. Pedicel 1-3 mm, pubescent. Calyx 4-5 mm; lobes linear-lanceolate, densely pubescent with non-glandular trichomes. Corolla white or light purplish, 3.5-4.5 cm, outside finely and sparingly pubescent with gland-tipped trichomes; tube 2.5-3.5 cm; lower lip 3-lobed, lobes oblong and ca. 1 cm; upper lip 2-lobed to middle. Stamens slightly exserted; filaments ca. 3 mm, glabrous; anther thecae ovoid. Ovary pilose; style basally white pilose; stigma spherical. Capsule clavate, ca. 2.5 cm. Seeds subcircular in outline, ca. 3.5 mm in diam., verrucose, glabrous. Fl. Apr-Jun, fr. Aug.
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