Coefficient of Conservatism:
Coefficient of Wetness:
A European species very locally adventive as a weed in North America. Collected in Michigan only in 1886 near Lansing, Ingham Co., by L. H. Bailey (GH).
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 11, 2017. http://michiganflora.net/species.aspx?id=230.