Description from Flora of China
Herbs perennial. Stems purplish, erect, acutely 4-winged/angled, wings ca. 0.25 mm wide, glabrous, white barbate at nodes. Petiole purple, 3-5 mm; leaf blade triangular-ovate, 1.5-3 × 1.2-1.8 cm, very sparsely white pubescent, base cuneate to cordate, margin irregularly 3-5-serrate, apex acute. Racemes terminal, lax, poorly defined, 3-7 cm; bracts leaflike, 5-7 mm, 1-crenate, short petiolate. Pedicel ca. 3 mm, pubescent. Calyx ca. 4 mm, pubescent on veins and margin outside; scutellum ca. 2 mm. Corolla purple-red, to 2 cm, densely white glandular pubescent outside; tube short, erect, base slightly saccate, throat to 6 mm wide, apex of upper lip 2-lobulate; middle lobe of lower lip to 6 mm wide, apex 4-lobulate.
* Evergreen broad-leaved forests; 2000-2200 m. Yunnan.