Helianthus strumosus L.
Coefficient of Conservatism: 4
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt P-Forb

Wide-ranging in the eastern United States and native at least in part in Michigan, though somewhat weedy. Habitats recorded for it are as diverse as its morphology; usually in dry sandy ground, including oak forests, but also in moist ground; roadsides, prairies, clearings, fields, river banks, and other places.

This species is unfortunately somewhat of a variable species in which have been accommodated all the eastern polyploid sunflowers that cannot be placed in any other species. It also seems to intergrade with others and to be quite plastic in leaf shape and other characters. For example, several specimens with leaves densely pubescent beneath and other characters of this taxon have the long phyllaries of H. decapetalus. Others seem to approach H. divaricatus.


Allegan County
Barry County
Bay County
Calhoun County
Cass County
Cheboygan County
Delta County
Hillsdale County
Ionia County
Jackson County
Kalamazoo County
Kent County
Lapeer County
Lenawee County
Livingston County
Macomb County
Menominee County
Midland County
Monroe County
Montcalm County
Newaygo County
Oakland County
Oceana County
Schoolcraft County
St. Clair County
St. Joseph County
Van Buren County
Washtenaw County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 22, 2021. https://michiganflora.net/species.aspx?id=358.