Plants herbaceous. Stems slender, 20-26 cm, sparsely appressed puberulent or subglabrous. Leaves basal or subbasal, rarely on stem, mostly simple, sometimes 2- or 3-foliolate; petiole 2.5-9 cm; leaf blade cordate-ovate, 2-4.3 × 1.3-3.6 cm, abaxially violet, glabrous, pubescent on veins, base cordate, margin undulate-crenate; terminal leaflets larger than lateral. Inflorescences puberulent; verticillasters 6-10-flowered, widely spaced, in terminal racemes or panicles 10-20 cm; bracts ovate-lanceolate, 2-5 mm. Pedicel ca. 1.5 mm. Calyx green, tubular, ca. 4.5 mm, abaxially tinged red when dry, subglabrous, sparsely yellowish glandular; upper lip semicircular-triangular, margin entire, apex mucronate; lower lip shallowly 2-toothed, teeth triangular. Corolla purple or white, ca. 7 mm, pubescent; tube finely pilose annulate inside, slightly exserted, ca. 0.8 mm wide, slightly dilated at throat; upper lip straight, lower lip longer. Stamens exserted; filaments ca. 1 mm; connectives 2-4 mm, upper arms ca. 1.5 mm, lower arms ca. 0.9 mm, without apical anther cells, separate. Nutlets brown, narrowly ovoid, ca. 1.3 mm, apex acute. Fl. Apr-May.

Hilltops, valleys, streamsides, waste areas, forests; 100-1200 m. Fujian, Guangdong, Guangxi, Guizhou, Hunan, Jiangxi, Taiwan, Zhejiang [Philippines]