Coefficient of Conservatism:
Coefficient of Wetness:
Collected by R. K. Rabeler in 1982 in a gravelly ditch at Hancock, Houghton Co., with D. carthusianorum.
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 15, 2017. http://www.michiganflora.net/species.aspx?id=752.