Nigrina serrata Thunberg, Nova Acta Regiae Soc. Sci. Upsal., ser. 2, 7: 142. 1815.

Leaf blade elliptic, obovate, or ovate-lanceolate, sometimes ovate-elliptic or oblong, glabrous, margin densely sharply serrate. Fl. Apr-May.

Wet places in forests, valleys, ravine thickets, swamps, streamsides; 100-1800 m. Anhui, Fujian, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Hunan, Jiangsu, Jiangxi, Sichuan, Yunnan [Japan, Russia (S Kurile Islands)]