There are many excellent sources for learning more about the flowers that grow on Lake Superior's coast.
Following are a few that I've found especially helpful:
Andy’s Northern Ontario Wildflowers http://www.ontariowildflowers.com
Minnesota Wildflowers http://www.minnesotawildflowers.info
New England Wildflower Society https://gobotany.newenglandwild.org
Rare Species Guide, Minnesota DNR http://www.dnr.state.mn.us/rsg
Wildflowers of the BWCA and the North Shore
by Mark Sparky Stensaas and Rich Kollath
(Duluth, MN: Kollath & Stensaas Publishing, 2003)
Given, David R. and James H. Soper. "The Arctic-Alpine Element of the Vascular Flora at Lake Superior."
National Museums of Canada, Publications in Botany, No. 10, 1981.
Nyman, Yvonne. "The Pollen-Collecting Hairs of Campanula (Campanulaceae). I. Morphological Variation
and Retractive Mechanism." American Journal of Botany. Vol. 80 (12), 1993.
Soper, James H., Edward G. Voss, and Kenneth E. Guire. “Distribution of Primula mistassinica in the Great
Lakes Region.” The Michigan Botanist. Vol. 4, 1965.