Description from Flora of China
Herbs erect. Stems 0.3-2 m tall, green or purple, finely pilose or densely villous. Petiole 3-5 cm; leaf blade broadly ovate to circular, 4.5-13 × 2.8-10 cm, green, purplish, or purple-black, pilose or adaxially pilose, abaxially appressed villous, base rounded to broadly cuneate, margin narrowly to coarsely serrate, apex short acuminate or mucronate. Verticillasters 1.5-15 cm, densely villous; bracts ca. 4 × 4 mm, short acuminate, red-brown glandular. Pedicel ca. 1.5 mm, densely villous. Calyx ca. 3 mm, erect, base villous, yellow glandular, lower lip longer than upper lip; fruiting calyx 4-11 mm, base villous or pilose, glandular. Corolla 3-4 mm, slightly puberulent, tube 2-2.5 mm. Nutlets gray-brown or tawny, 1-1.5 mm in diam. Fl. Aug-Nov, fr. Aug-Dec.
Waste areas, cultivated in gardens. Fujian, Guangdong, Guangxi, Guizhou, Hebei, Hubei, Jiangsu, Jiangxi, Shanxi, Sichuan, Taiwan, Xizang, Yunnan, Zhejiang [Bhutan, Cambodia, India, Indonesia (Java), Japan, Korea, Laos, Vietnam]