Equisetum fluviatile L.
Common Name: WATER HORSETAIL

Coefficient of Conservatism: 7
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt Fern Al

This is basically a marsh emergent, occurring in water to 6-8 dm deep; also occurring on lake shores, slow moving streams, very wet meadows and swales, ditches, bog margins and sometimes on moist shores. It can grow in understories of swamp forests, but is mostly in sunny sites.
This is an easily recognized species because the stems are soft and easily flattened due to the large diameter of the central cavity (the stem like a soda straw in morphology). Hybridizes rarely with E. arvense to form E. ×litorale, a plant generally intermediate in both habitat and morphology (see E. arvense).

Locations

Allegan County
Antrim County
Arenac County
Baraga County
Barry County
Benzie County
Berrien County
Branch County
Calhoun County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Chippewa County
    Only on Drummond Island
Clare County
Clinton County
Delta County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lapeer County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston 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
Newaygo County
Oakland County
Oscoda County
Ottawa County
Roscommon County
Schoolcraft County
St. Clair County
Washtenaw County
Wexford County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. October 24, 2014. http://michiganflora.net/species.aspx?id=1198.