Verbena officinalis seeds mature in Oct.马鞭草 ma bian cao. Grassy places on mountain slopes; 100-1800 m. Anhui, Fujian, Gansu, Guangdong, Guangxi, Guizhou, Hainan, Hubei, Hunan, Jiangsu, Jiangxi, Shaanxi, Shanxi, Sichuan, Taiwan, Xinjiang, Xizang, Yunnan, Zhejiang [worldwide weed in temperate zones and tropics.