Phalaris arundinacea L.
Coefficient of Conservatism: 0
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt P-Grass

Marshes and wet shores, borders of streams and ponds, in ditches. The glumes are usually glabrous, rarely minutely hispidulous.

The species is apparently native, in part, but can also form dense stands completely choking out other vegetation. It is, in fact, becoming a serious problem in wetlands in southern Michigan especially. That weedy elements are derived from introductions from Europe was suggested by Dore & McNeill (1980), for the species is also native in Eurasia. The genetic studies of Jakubowski, Jackson, & Casler (2014) provide more evidence of alien and native races, plus documentation of native populations in northern Michigan, though morphological discrimination of the two remains elusive. Phalaris was collected by the First Survey in 1838.

In f. variegata (Parn.) Druce (Ribbon Grass), frequently cultivated for its ornamental foliage, the leaf blades are longitudinally striped with white or cream. Colonies of this form (known from Houghton, Ingham, Jackson, Kent, Keweenaw, Leelanau, Osceola, St. Clair, Shiawassee, Washtenaw, and Wayne Cos.) are presumably escapes from cultivation. 

Sometimes separated as Phalaroides arundinacea  (L.) Rauschert from the rather different looking annual species.


Alcona County
Alger County
Alpena County
Antrim County
Arenac County
Baraga County
Barry County
Bay County
Benzie County
Berrien County
Branch County
Calhoun County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Clinton County
Crawford County
Delta County
Eaton County
Emmet County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia 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
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Midland County
Missaukee County
Monroe County
Montmorency County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Osceola County
Oscoda County
Ottawa County
Presque Isle County
Roscommon County
Schoolcraft County
Shiawassee County
St. Clair County
St. Joseph County
Tuscola 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. December 2, 2022.