Matricaria discoidea DC.
Common Name: PINEAPPLE-WEED
Coefficient of Conservatism: *
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Ad A-Forb

Usually considered native to western North America, but migrated eastward in historic times. First collected 1921 (Houghton Co.) and 1925 (Oakland Co.). In the 1930’s, six widely dispersed counties were added to the documented distribution, and the species is still spreading extensively. Usually in relatively bare disturbed sites: roadsides, railroads, cultivated fields and gardens, lawns, cut-over forests, vacant lots, dumps, gravel pits, parking lots, fill, etc. This is one of the few weedy American plants that has apparently spread to (rather than from) Europe.

Locations

Alcona County
Alger County
Alpena County
Antrim County
Arenac County
Baraga County
Benzie County
Berrien County
Branch County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Crawford County
Delta County
Dickinson County
Eaton County
Emmet County
Gladwin County
Gogebic County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia County
Iosco County
Iron County
Isabella County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Lapeer County
Leelanau County
Lenawee County
Luce County
Mackinac County
Macomb County
Marquette County
Mecosta County
Menominee County
Monroe County
Montmorency County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Osceola County
Oscoda County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Sanilac County
Schoolcraft County
St. Clair County
St. Joseph 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. September 23, 2017. http://michiganflora.net/species.aspx?id=406.