Coefficient of Conservatism:
Coefficient of Wetness:
Native of Europe and adjacent areas; a very local weed of roadsides and yards first collected in Michigan in 1961 in Houghton Co.
Hybrids between our two species are known (A. ×hybrida A. Kern.).
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 20, 2018. http://michiganflora.net/species.aspx?id=1535.