Fleabane, a genus of about 200 species of annual and perennial herbs with daisy-like flowers. The name refers to a superstition that the plants drive away fleas. Fleabanes grow chiefly in temperate regions.
The Canada fleabane, horseweed, or butterweed, grows to more than six feet (1.8 m) tall and bears numerous tiny flowers that do not spread open. It is common in waste places in North America; so are the common fleabane and the daisy fleabane. Both of these species grow to more than four feet (1.2 m) tall. They bear yellow-centered white, pink, or purplish flowers about half an inch (13 mm) in diameter.
Fleabanes belong to the genus Erigeron of the family Compositae. Canada fleabane is E. canadensis; common, E. annuus; daisy, E. strigosus.Fleabane , or horseweed, grows more than six feet tall and bears tiny flowers.