Coefficient of Conservatism:
Coefficient of Wetness:
Native farther south, in Michigan first collected in 1968 in Gratiot Co. (G. Gopoian in 1968, ALM). Like T. luteum, it is a popular shade-garden plant apparently spreading from cultivation elsewhere in Michigan though herbarium documentation is sparse as yet.
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. March 20, 2018. http://michiganflora.net/species.aspx?id=2729.