Equisetum pratense Ehrh.
Common Name: MEADOW HORSETAIL
Coefficient of Conservatism: 10
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt Fern Al

Equisetum pratense stand A. A. Reznicek stand

Moist to wet deciduous or mixed conifer-hardwood forests, often in springy or seepy sites or along streams; conifer swamps; very local, especially southward. 

A much more delicate and slender plant than Equisetum arvense, shade forms of which are often mistaken for it. Fertile stems are rarely collected and poorly known. Branching of the fertile stems after the strobilus is spent seems more erratic and irregular than in E. sylvaticum.  Occasional fertile stems may not develop branches and simply wither, but this requires more field observations. The internodes of the main stem of E. pratense are finely papillose-roughened, even on the fertile stems. 

Locations

Alcona County
Alger County
Alpena County
Baraga County
Benzie County
Cheboygan County
Chippewa County
    Including Drummond Island
Delta County
Dickinson County
Emmet County
Gladwin County
Gogebic County
Houghton County
Ingham County
Keweenaw County
Lake County
Lapeer County
Leelanau County
Luce County
Mackinac County
Macomb County
Marquette County
Menominee County
Ontonagon County
Otsego County
Presque Isle County
Schoolcraft County
St. Clair County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 16, 2017. http://michiganflora.net/species.aspx?id=1202.