Philadelphia fleabane (Erigeron philadelphicus, Asteraceae) is a common native weed throughout most of North America. Also called common fleabane, this aster features yellow disc florets and up to 250 thin ray florets that vary in color from white to pink (Brandenburg 2010).
The aster family is extremely diverse, and the genus Erigeron (fleabanes) contains 191 North American species. Identification of asters to the species level often seems daunting, but it’s not impossible. Of this genus there are only a handful that occur in the Great Lakes region. Of these, only Philadelphia fleabane has the aforementioned flower structure and leaves that wrap around the stems.
Brandenburg, D.M. 2010. National Wildlife Federation Field Guide to Wildflowers of North America. Andrew Stewart Publishing, Inc., New York, NY.