Description from Flora of China
Herbs erect, rhizomatous. Stems ca. 55 cm tall, ascending, base ca. 2.5 mm wide, densely white pilose, sometimes with short leafy branchlets. Petiole 1-1.8 cm; leaf blade broadly ovate, 5-7 × 2.5-4.5 cm, papery, adaxially sparsely pilose, abaxially pilose and with purple-black glands, veins whitish, base rounded to shallowly cordate, margin coarsely crenate to double crenate, apex obtuse. Racemes terminal or axillary; bracts deciduous. Pedicel ca. 2 mm, densely pilose. Calyx ca. 2 mm, to 3 mm in fruit, densely pilose; scutellum ca. 1.5 mm in fruit. Corolla purple-red, 1.6-1.9 cm, sparsely puberulent outside, sparsely pilose at middle inside, base bent, throat to 4 mm wide; middle lobe of lower lip broadly ovate, ca. 3.5 mm wide, apex emarginate; lateral lobes ovate, ca. 2 mm wide. Nutlets unknown. Fl. May.
* Forests. Guangdong (Ruyuan Yao Xian).