Coefficient of Conservatism:
Coefficient of Wetness:
P. canbyi of Michigan Flora.
Rock crevices on Isle Royale. Michigan plants belong to subsp. secunda.
This is a primarily western species disjunct to the Great Lakes region.
Only on Isle Royale
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 16, 2017. http://michiganflora.net/species.aspx?id=2204.