Description from Flora of China
Flowering stems simple or branched, erect or prostrate, 9-15 cm. Leaves alternate or 3-verticillate, pseudopetiolate, usually deciduous; leaf blade ovate to orbicular, 1.5-3.2 × 1-1.3 cm, base abruptly and narrowly cuneate, apex rounded, minutely papillate. Cyme scorpioid, pedunculate; bracts shortly petiolate, orbicular, 4-5 mm, apex minutely papilliferous. Flowers unequally 4-merous. Sepals narrowly triangular, ca. 0.8 mm, apex obtuse. Petals lanceolate-oblong, 3.5-5 × ca. 1 mm, apex obtuse. Stamens 8, slightly shorter than petals; antepetalous ones inserted ca. 0.8 mm from petal base. Nectar scales broadly spatulate, ca. 0.7 × 0.4 mm, apex obtuse. Carpels 4, divergent, 4-5 mm, base connate. Styles ca. 0.8 mm. Follicles many seeded. Seeds ovoid, 1-1.2 mm, mammillate. Fl. Aug-Sep.
* Among rocks near streams; 500-1000 m. Anhui, Guangdong, Guizhou, Jiangxi.