Coefficient of Conservatism:
Coefficient of Wetness:
Probably originally introduced from South or Central America, now a widespread weed throughout the world. Collected only twice in Michigan: in disturbed sites at Detroit (Wayne Co.) in 1893 and on the shores of Little Traverse Bay (Emmet Co.) in 1896.
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 16, 2017. http://michiganflora.net/species.aspx?id=517.