Euphorbia polygonifolia L.
Coefficient of Conservatism: 10
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt A-Forb

Euphorbia polygonifolia A. A. Reznicek

Restricted in North America to the sandy beaches and dunes of the Great Lakes and the Atlantic Ocean; one of the few native annuals (along with Cakile) in such habitats. Appearances on the northernmost shores of Lakes Huron and Michigan appear sporadic and irregular; evidently absent from the Lake Superior shore.

This species tends to develop and fruit a little later than other common prostrate ones, but even if its distinctive relatively large fruits and smooth large seeds are not developed, the slender entire leaf blades (a little less oblique than in other species) and lack of petaloid appendages on the cyathium should help in recognizing it, apart from the restricted habitat.


Allegan County
Arenac County
Benzie County
Berrien County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Emmet County
Grand Traverse County
Huron County
Iosco County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Manistee County
Mason County
Menominee County
Monroe County
Muskegon County
Ottawa County
St. Clair County
Van Buren County


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