ERIKA ALIN
There are many excellent sources for learning more about the flowers that grow on Lake Superior's coast.
Following are a few 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)
Anderson, Chel and Abdelheid Fischer. "Hay Pickers and Grass Gatherers: Botanical Exploration along the
Lakeshore." North Shore: A Natural History of the Minnesota Superior Coast. Minneapolis: University of Minnesota Press, 2015, 333-348.
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.
Larson, B.M.H and S.C.H. Barrett. Reproductive Biology of Island and Mainland Populations of Primula
mistassinica (Primulaceae) on Lake Huron shorelines. Canadian Journal of Botany 76, 1998.
Nature Gate. Knotted Pearlwort, Sagina nodosa.
http://www.luontoportti.com/suomi/en/kukkakasvit/knotted-pearlwort
Nyman, Yvonne. "The Pollen-Collecting Hairs of Campanula (Campanulaceae). I. Morphological Variation
and Retractive Mechanism" and II. Function and Adaptive Significance in Relation to Pollination.”American Journal of Botany. Vol. 80 (12), 1993.
Penskar, M.R. Special Plant Abstract for Sagina nodosa (pearlwort). Michigan Natural Features
Inventory. Lansing, MI, 2008.
Penskar, M.R. and J.A. Hansen. Special Plant Abstract for Pinguicula vulgaris (butterwort). Michigan Natural
Features Inventory, Lansing, MI, 2009.
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.