Description from Flora of China
Plants 15-30 cm tall. Rhizomes short, stout, with long rootlets. Stems erect, terete, striate, simple. Basal leaves short petiolate; leaf blade obovate-spatulate, 8-10 × 3-6 cm including petiole, base narrowed, margin entire or slightly undulate, apex rounded, veins pinnate. Stem leaves sessile, spatulate, 1.5-2.5 cm × 7-10 mm, base rounded, margin entire, apex obtuse, veins pinnate. Inflorescences erect, rachis terete, striate, simple, ca. 3 mm wide when pressed; nodes minutely hairy. Pedicel spreading, 8-10 mm; bractlets 2 per flower, linear-lanceolate, 5-7 mm. Calyx 3.5-4.5 mm; lobes linear-lanceolate, apex acuminate, veins distinct. Corolla greenish, 1-1.2 cm; lobes ovate-triangular, 5-6 mm, margin entire, apex acuminate. Filaments 0.8-1 mm; anthers ellipsoid, 0.3-0.5 mm. Style linear, 2-3 mm. Capsules sessile, ovoid-conic, 1.5-1.8 cm. Seeds dark brown, 1.3-1.6 mm.
* Roadsides, forests; 1000-2100 m. Fujian, Guangdong, Guangxi, Guizhou, Hunan, SE Sichuan, NE Yunnan.