Description from Flora of China
Herbs perennial, 1-2 m tall. Stem erect or slightly stoloniferous, terete or angulate, simple or branched, gradually glabrous downward. Leaves opposite or alternate; petiole 2-10 mm, pubescent; leaf blade ovate, oblong, or lanceolate, 1-7 × 0.5-3 mm, base cuneate, both surfaces pubescent and ciliate, apex acute, with a mucro. Spikes terminal or axillary, 1-5 cm × 3-4 mm, lanose, in terminal complex thyrsoid structures. Flowers many, dense, ca. 2 mm. Bracts and bracteoles ovate, 1-1.5 mm, adaxially pilose. Tepals white, oblong, 2-2.5 mm, with a green midvein, adaxially glabrous, slightly hairy, apex acuminate. Stamens ca. 1 mm; pseudostaminodes triangular. Utricles ovate, ca. 2 mm, glabrous. Seeds black, reniform, ca. 1 mm. Fl. and fr. Apr-Oct.
Hillsides; above 2500 m. Guangdong, Guangxi, Guizhou, Yunnan [India, Myanmar].