Carex tonsa (Fernald) E. P. Bicknell
Common Name: SEDGE
Synonym: Carex rugosperma
Coefficient of Conservatism: 5
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Nt P-Sedge

Carex tonsa var. tonsa A. A. Reznicek var. tonsa

C. rugosperma of Michigan Flora.

Generally in dry sandy (sometimes rocky) ground, including fields, stabilized dunes, and open oak, aspen, or pine forests and savannas; mostly in acidic soils.

Plants with thick, short, rigid leaves and perigynia glabrous or nearly so are var. tonsa in contrast to var. rugosperma (Mack.) Crins with long, thin, flexuous leaves and pubescent perigynia. Both varieties occur throughout Michigan; occasionally occurring together, but with the var. tonsa favoring dry open barren habitats. Early fruiting and inconspicuous, like the similar C. umbellata, and doubtless much overlooked.


Alcona County
Alger County
Allegan County
Alpena County
Antrim County
Barry County
Bay County
Benzie County
Berrien County
Cheboygan County
Chippewa County
    Including Drummond Island
Clinton County
Crawford County
Delta County
Dickinson County
Eaton County
Emmet County
Gogebic County
Grand Traverse County
Gratiot County
Huron County
Ingham County
Iosco County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Lapeer County
Leelanau County
Livingston County
Luce County
Mackinac County
Manistee County
Marquette County
Mecosta County
Midland County
Missaukee County
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Ogemaw County
Ontonagon County
Oscoda County
Ottawa County
Presque Isle County
Roscommon County
Schoolcraft County
Shiawassee County
St. Clair County
Tuscola County
Van Buren County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. July 23, 2021.