Description from Flora of China
Herbs erect. Stems 40-80 cm, densely pubescent and spreading pilose. Petiole 2-10 cm; leaf blade ovate-cordate, 9-17 × 4-10 cm, pubescent and pilose especially on veins abaxially, distinctly glandular, base cordate, margin crenulate, apex acuminate. Thyrses 7-30 cm, 1.5-2 cm in diam.; verticillasters many, 2-10-flowered, surrounded by minute subulate bracts; rachises densely minutely hispid and spreading pilose; bracteoles minute, subulate. Pedicel ca. 1 mm, to 2 mm in fruit, base 1-bracteolate, densely minutely hispid and spreading pilose. Calyx campanulate, ca. 3 mm, puberulent, glandular, subglabrous in fruit, bristly annulate inside; tube ca. 2 mm, throat glandular otherwise glabrous; teeth lanceolate, apex acute, posterior tooth largest, broadly ovate, apex truncate. Corolla ca. 9 mm, limb purple; tube white, puberulent, retrorse pubescent inside; middle lobe of lower lip subcircular, lateral lobes ovate. Nutlets black, ca. 1 mm. Fl. Apr, fr. Apr-May.
Streamsides, wet areas in forests; 1200-1800 m. Yunnan [Myanmar, Vietnam].