Coefficient of Conservatism:
Coefficient of Wetness:
Named for Polygonum, but also on Cephalanthus and doubtless other genera. Distinctive among our species in its very short style.
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 6, 2020. https://michiganflora.net/species.aspx?id=858.