Coefficient of Conservatism:
Coefficient of Wetness:
A. A. Reznicek
A North American arctic species, coming as far south as the United States only in Isle Royale National Park, where it grows on rock on the main island and on several of the offshore islands at the northeastern end of the archipelago. It is apparently very local on the nearby Canadian shore.
Only on Isle Royale
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 14, 2017. http://www.michiganflora.net/species.aspx?id=2671.