Coefficient of Conservatism:
Coefficient of Wetness:
R. W. Smith
Old fields; a rare escape from cultivation. A commonly grown subshrubby herb, first collected outside of cultivation by J. Wesch in Iron Co. in 2001.
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 22, 2018. http://www.michiganflora.net/species.aspx?id=2825.