Coefficient of Conservatism:
Coefficient of Wetness:
Barely reaches into southern Michigan from the south, but goes farther north in Wisconsin; not native in Ontario. Undoubtedly native on river bluffs and in wet prairies, fens, and tamarack swamps in the southwestern Lower Peninsula.
This showy spring flower is commonly cultivated, and Washtenaw and Monroe Co. collections may be escapes from cultivation; an undated collection from Olivet, Eaton Co., (Atkinson, CU), could well have been simply collected from cultivated and is not mapped.