Elymus repens (L.) Gould
Common Name: QUACK GRASS
Synonym: Agropyron repens
Coefficient of Conservatism: *
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Ad P-Grass

Elymus repens ex W. H. Wagner slide collection

Agropyron repens of Michigan Flora.

A familiar weed of roadsides, clearings, fields, gardens, and disturbed ground generally; spreading into forests and on shores and dunes, where often appearing as if native. Introduced from Eurasia, at least in Michigan. While first collected in 1845 in Macomb Co., most collections are post-1900.

Extremely variable in the nature of awns, glumes, and pubescence of rachis. Rarely a robust plant will have 2 spikelets at most nodes of the spike and, with wide leaves, will thus closely resemble E. glaucus; however, the anthers of E. glaucus are shorter than the distinctive long ones of E. repens (3–6 mm), and E. glaucus lacks long-creeping rhizomes.


Alcona County
Alger County
Allegan County
Alpena County
Antrim County
Arenac County
Baraga County
Barry County
Benzie County
Berrien County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clinton County
Crawford County
Delta County
Dickinson County
Eaton County
Emmet County
Genesee County
Gladwin County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia County
Iosco County
Iron County
Isabella County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Lapeer County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Marquette County
Mason County
Mecosta County
Menominee County
Midland County
Monroe County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ontonagon County
Oscoda County
Ottawa County
Presque Isle County
Schoolcraft County
Shiawassee County
St. Clair County
St. Joseph 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. November 26, 2022. https://www.michiganflora.net/species.aspx?id=2101.