Description from Flora of China
Herbs perennial, stoloniferous. Stems erect, 20-40 cm tall, spreading villous, much branched. Petiole 1-2 cm, spreading villous; leaf blade of mid stem leaves circular to ovate-triangular, 2-4 × 1.8-3 cm, basal leaf blade sometimes subreniform, 0.7-1.3 × 0.5-1.5 cm, adaxially appressed villous, abaxially puberulent except for villous veins, base truncate to subcordate, margin double crenate, apex obtuse to acute. Verticillasters 2-flowered, in spikes 5-10 cm; rachis villous; bracts ovate, 3-lobed. Pedicel 2.5-3.5 mm, villous. Calyx campanulate, 3-4 × 2-2.5 mm; teeth triangular, subequal, obtuse, subglabrous except for ciliate margin. Corolla purplish red, 7-8 mm, subglabrous outside; limb obliquely spreading, middle lobe subcircular, lateral lobes obliquely ovate-triangular and subequal. Nutlets chestnut brown, oblong-obovoid, ca. 1.2 mm, smooth. Fl. Jul.
Forests; 1800-2500 m. Hunan, Liaoning, Sichuan, Yunnan [Japan, Korea].