Herbs perennial. Stems slender, 30-60 cm tall, pubescent. Petiole slender, 1-4 cm; leaf blade triangular-ovate, 1.5-6.4 × 1.5-2 cm, hirtellous, adaxially olive green, abaxially greenish, base cordate, margin crenate to dentate, apex acute. Cymes axillary, sometimes helicoid, in loose terminal panicles; bracts subulate, minute, ca. 2.5 mm. Calyx tubular, minutely hispid, ca. 4 mm, veins elevated; teeth subequal, lanceolate, ca. 1 mm. Corolla purple, ca. 8 mm, pubescent, glabrous inside; tube ca. 0.8 mm in diam. at base, narrowest part ca. 2 mm, abruptly dilated into throat ca. 3 × 3 mm; upper lip ca. 1.2 mm, 2-lobed; lower lip longer, middle lobe subcircular, ca. 2.5 × 2.2 mm, margin undulate. Style exserted. Nutlets dark purple-brown, ovoid, triquetrous, ca. 0.8 × 0.6 mm, glabrous. Fl. and fr. Apr-Oct.

* Thickets; 100-700 m. Guangdong, Henan, Hubei, Hunan, Shaanxi, Sichuan.