Description from Flora of China
Herbs with long, lanate stolons. Stems solitary, ca. 50 cm, retrorse strigose, leafless toward base. Lower stem leaves early deciduous; petiole densely strigose, 3-5 cm, longest basally; upper stem leaf blades broadly triangular-ovate, 4-9 × 3-6 cm, herbaceous, adaxially sparsely strigose, densely so on veins, abaxially densely white tomentose except for strigose veins, base broadly cuneate, margin gradually remote dentate-serrate above base, apex short acuminate; lateral veins 5-7 pairs, inconspicuous. Verticillasters 4-8-flowered, surrounded by leaflike bracts and linear bracteoles; peduncle ca. 5 mm. Flowers sessile. Calyx tubular-campanulate, 8-9 mm, densely strigose, hirsute inside, veins inconspicuous; teeth equal, narrowly triangular, acute. Corolla white, 1.5-2 cm, densely strigose, slender, straight, recurved at apex; upper lip oblong, entire; lower lip somewhat larger, middle lobe trapeziform, apex emarginate, hirsute-puberulent inside. Ovary glabrous. Fl. Jul.
* Valley streamsides. Hunan.