Alliaria petiolata (M. Bieb.) Cavara & Grande
Coefficient of Conservatism: *
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Ad B-Forb

A native of Europe and Asia, naturalized locally in North America, but often abundant where found, in disturbed ground, such as roadsides, and in moist forests, even swamps. Now a serious pest of forest understories in some areas. The spread of this species has been recent; the first collection was in 1956 in Kent Co.

The Allium-like odor of the bruised plant is unusual in a family where the odor, if any, is normally of a turnip, cabbage, or horseradish nature. Alliaria is also distinctive in its slenderly petioled leaves with broad ± triangular, often cordate blades. The white petals are ca. 4–7 mm long and the fruit is a slender silique on a pedicel nearly as thick. It is a biennial, with ± evergreen basal rosettes whose leaves are more rounded than the stem leaves.


Allegan County
Alpena County
Antrim County
Barry County
Benzie County
Berrien County
Branch County
Calhoun County
Cass County
Eaton County
Emmet County
Gogebic County
Hillsdale County
Houghton County
Ingham County
Ionia County
Iron County
Jackson County
Kalamazoo County
Kent County
Lake County
Lapeer County
Lenawee County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Marquette County
Mason County
Mecosta County
Monroe County
Muskegon County
Newaygo County
Oceana County
Ontonagon County
Ottawa County
Van Buren County
Washtenaw County
Wayne County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. September 27, 2022.