1775 Conyza canadensis (L.) Cronq.

Syn.: Erigeron canadensis L.

This species originates from N. America. From there it has spread as a weed over large areas in Europe, Africa, Asia, S. America, Australia and New Zealand. The present distribution is nearly circumpolar (Hultén, Circumpol. Il, p. 246, 391 and map 238).