Coefficient of Conservatism:
Coefficient of Wetness:
R. W. Smith
Collected along railroads 1919–1922; adventive from somewhat farther south.
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 19, 2018. https://www.michiganflora.net/species.aspx?id=2242.