Description from Flora of China
Herbs perennial, rhizomatous. Stems 40-80 cm tall, ascending, ca. 2 mm in diam., rust pubescent, glandular, sometimes subglabrous, corky toward base. Petiole 1-1.6 cm; leaf blade elliptic to obovate-elliptic, 5-9 × 2.5-4 cm, yellowish glandular, adaxially sparsely pubescent, densely so along margin, abaxially gray or purplish and glabrous, base cuneate, margin undulate-crenate, apex acute. Racemes terminal, 4.5-7.5 cm; peduncle ca. 1.4 cm; bracts sessile, elliptic, 4-4.5(-7) mm, margin entire to sparsely serrate above middle, glandular, ciliate. Pedicel ca. 3 mm, densely glandular pubescent. Calyx ca. 2 mm, glandular outside, margin ciliate; scutellum spreading, ca. 1 mm. Corolla purplish or purple-red, ca. 2.2 cm, sparsely puberulent, glandular; tube ca. 1.6 cm, base bent, throat to 6 mm wide; middle lobe of lower lip oblate, ca. 5 mm wide, apex emarginate; lateral lobes triangular, ca. 2.5 mm wide. Nutlets unknown. Fl. Apr.
* Wet broad-leaved forests on limestone; 1400-1700 m. Yunnan (Xichou Xian).