Coefficient of Conservatism:
Coefficient of Wetness:
Native west and south of Michigan; widely cultivated, and our plants are doubtless escaped in marshy fields and ditches. First collected in 1952 in Ottawa Co. An earlier Farwell collection, from Wayne Co. in 1920, contains a source attribution from Oklahoma ad the plants was probably from cultivation and is not mapped.
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 11, 2017. http://michiganflora.net/species.aspx?id=399.