Thlaspi arvense L.
Common Name: PENNY CRESS
Coefficient of Conservatism: *
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Ad A-Forb

A native of Eurasia, long a weed of disturbed areas; the earliest Michigan collection (CU) seen is from Mackinac Island, by Horace Mann, Jr. (and Henry David Thoreau), in 1861.

Locations

Alger County
Allegan County
Alpena County
Arenac County
Bay County
Benzie County
Berrien County
Cheboygan County
Chippewa County
Crawford County
Delta County
Dickinson County
Eaton County
Emmet County
Gogebic County
Gratiot County
Hillsdale County
Houghton County
Ingham County
Ionia County
Isabella County
Kalamazoo County
Keweenaw County
    Including Isle Royale
Lapeer County
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Marquette County
Mecosta County
Monroe County
Montmorency County
Oakland County
Ontonagon County
Ottawa County
Saginaw County
Schoolcraft County
St. Clair County
St. Joseph County
Tuscola County
Van Buren County
Washtenaw County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 14, 2017. http://michiganflora.net/species.aspx?id=685.