Shrubs 1-2 m tall. Stems densely pubescent, sometimes also sparsely bristly. Petiole 1.5-2 cm, pubescent; leaf blade ovate, 3-8 × 1.5-5 cm, pilose, base cordate, margin finely crenate-serrate, slightly corrugate, apex subacuminate. Cymes (1-)3-flowered, pubescent; peduncle 1-2 cm; bracteoles leaflike to linear or linear-lanceolate, 4-6 mm, ciliate. Pedicel 5-7 mm. Calyx campanulate, ca. 1 cm in flower, to 1.5 cm in fruit, sparsely pubescent outside, glabrous inside, tube ca. 8 mm; teeth 5, triangular to broadly triangular, equal, ca. 2 mm, apex mucronate-acuminate. Corolla yellow, ca. 3.2 cm, puberulent outside, glabrous inside; tube ca. 2.2 cm, dilated in throat; upper lip ca. 3 mm, emarginate; lower lip larger, middle lobe slightly undulate to conspicuously dentate. Filaments puberulent. Style glabrous, equally 2-cleft. Nutlets black-brown, ovoid-ellipsoid, ca. 1 × 2.5 mm, flattened, winged at apex, striate.
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