Description from Flora of China
Shrubs or robust herbs. Stems 1-5 m tall, flexuous, densely tawny stellate lanate. Petiole 1-4.5 cm; leaf blade oblong to broadly ovate, 11.5-26.5 × 4-11.5 cm, adaxially with minutely hispid and stipitate furcate-stellate hairs, abaxially densely gray stellate pubescent, base cuneate to cuneate-attenuate, margin coarsely serrate to crenate-dentate, apex acute to acuminate. Cymes many flowered, crowded, subsessile; bracts oblong, 9-14 × 3-4 mm; bracteoles linear, 6-9 × to 1.5 mm. Calyx campanulate, 9-11 × 5-6 mm, densely tawny stellate lanate, conspicuously veined, slightly enlarged and eventually splitting in fruit; teeth broadly triangular, 1-1.5 × ca. 3.5 mm. Corolla white or purplish, 2.4-3 cm, densely stellate lanate; tube ca. 1.5 mm in diam., apical half abruptly dilated to 9 mm wide at throat; upper lip straight, circular, ca. 5 × 7-8 mm; lower lip ca. 8 × 11 mm, middle lobe larger and obcordate, lateral lobes ovate. Ovary densely tawny hispidulous. Nutlets 4, abaxially oblong, triquetrous rounded, 4-5 × 3-3.5 mm, chestnut brown, with deciduous hairs. Fl. May, fr. Aug-Dec.
* Valley thickets, evergreen streamside forests; 700-1100 m. Yunnan.