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.
"Lvs ovate-oblong to broadly ovate, 8–15 cm, short- acuminate, coarsely serrate or incised; infls 5–15 cm, terminal and from the upper axils; bracts oval, folded; pedicels 1–3 mm; cal at anthesis 3 mm, in fr 9–12 mm and hairy within. Native of India, cult. for its ornamental foliage and sometimes used as a condiment, but in larger amounts causing severe pulmonary edema; escaped into waste places and roadsides, Mass. to Io. and Kans., s. to Fla. and Tex. Aug., Sept."