Description from Flora of China
Herbs rhizomatous. Stems 28-35 cm tall, erect, glabrous except for pubescent angles, purple-black when dry. Petiole of mid stem leaves 1.5-4 cm; leaf blade dark purple-black abaxially, cordate, 3-5.5 × 2.7-3.8 cm, herbaceous, sparsely white strigose, abaxially light colored and glabrous, veins finely pubescent, base cordate, margin crenate, apex obtuse. Racemes terminal and axillary, 4.5-12 cm; bracts oblanceolate, slightly longer than pedicel, sparsely ciliate. Pedicel 1.5-2.5 mm, densely pubescent. Calyx ca. 2 mm, glandular puberulent; scutellum ca. 1 mm. Corolla 1.4-1.6 cm, puberulent outside, tube straight, base slightly saccate, throat to 4 mm wide; middle lobe of lower lip spreading, triangular-ovate, ca. 3 mm wide, margin entire; lateral lobes oblong, ca. 2 mm wide. Nutlets unknown. Fl. Apr.
* Guangdong (Yingde Xian).