Description from Flora of China
Herbs. Stems ascending, to 50 cm, base prostrate, to 7 mm in diam., strigose, glabrescent. Petiole 2-6 cm, densely pubescent; leaf blade ovate, 11-18 × 6-8 cm, membranous, sparsely pubescent, densely so on veins, adaxially also bristly, base rounded, margin crenulate, apex acute. Verticillasters many flowered, globose; bracteoles oblanceolate-obovate, 3-6 × 2-3 mm, membranous, conspicuously ribbed, apex sparsely bristly. Flowers sessile. Calyx tubular-campanulate, nearly transparent, sparsely white bristly, glabrous inside, ca. 7 mm; teeth broadly triangular, acute, less than 1 × 2 mm; mouth subtruncate, pleated. Corolla purple, ca. 1.5 cm, glabrous on limb; tube slender, to 10 × 1.2 mm, uniformly wide, glabrous, pilose annulate inside; upper lip oblong, ca. 5 mm, erect, margin entire; lower lip horizontally spreading, middle lobe ovate, emarginate; lateral lobes oblong, margin entire. Ovary black-brown, glabrous. Nutlets unknown.
Sandy streamsides in tropical rain forests; 100-2500 m. Yunnan [Vietnam].