Solidago ptarmicoides (Torr. & A. Gray) B. Boivin
Coefficient of Conservatism: 6
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt P-Forb

Local in jack pine plains and sandy prairie-like areas; calcareous flats along Lake Huron; limestone outcrops; fens and calcareous river banks; rock crevices and ledges on Lake Superior. Very local southward.

This species was long placed in the broadly construed genus Aster, which it resembles in the numerous, long, and white rays compared with those of the other flat-topped goldenrods. It hybridizes with typical goldenrods, not with true asters. Hybrids with S. ohioensis [S. ×krotkovii B. Boivin] occur rarely where the two species grow together, e.g., on Drummond Island (Chippewa Co.), along the Escanaba River (Delta Co.), and at Thompson's Harbor (Presque Isle Co.) First-generation hybrids are recognizable in the field because of the pale yellow or cream-colored rays. Such plants may resemble S. houghtonii; however, the rays are not only paler, but also more numerous and/or longer; the pedicels may be smooth and glabrous, scabrous, or rough-hispidulous. Some intermediates appear closer to one presumed parent and some to the other; backcrossing can be suspected.


Alcona County
Allegan County
Alpena County
Chippewa County
    Only on Drummond Island
Crawford County
Delta County
Iosco County
Keweenaw County
    Including Isle Royale
Lake County
Mackinac County
Macomb County
Mecosta County
Menominee County
Midland County
Newaygo County
Oakland County
Ogemaw County
Oscoda County
Presque Isle County
Tuscola County
Washtenaw County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. November 26, 2022.