Coefficient of Conservatism:
Coefficient of Wetness:
P. pensylvanica of Michigan Flora.
Rock outcrops and adjacent clearings near Lake Superior; mostly occurring to the west and north of the Great Lakes but also in the Gulf of St. Lawrence.
Including Isle Royale
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 11, 2017. http://www.michiganflora.net/species.aspx?id=2511.