Carex nigra (L.) Reichard
Common Name: BLACK SEDGE
Coefficient of Conservatism: 7
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt P-Sedge
Status: E
Carex nigra A. A. Reznicek

Very rare and scattered in meadows and swales in sandy soils.

The occurrence of the primarily northeast coast Carex nigra in Michigan (and the Great Lakes region) is puzzling. The few old records are from major ports and shipping channels in the southern Great Lakes region (including a 1904 collection from the shores of Belle Isle, in Detroit). It might seem these mark it clearly as a sporadic introduction. But the few recent northern Michigan collections are away from ports and shipping channels and associated with postglacial Great Lakes shorelines; the Upper Peninsula occurrence also quite far from habitation (though admittedly near an old trail). These could plausibly be considered native. 

A recent Ontario collection is a clear introduction in a roadside ditch. More observations are needed. 

Locations

Alcona County
Schoolcraft County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 27, 2021. https://www.michiganflora.net/species.aspx?id=1015.