Eleocharis palustris (L.) Roem. & Schult.
Common Name: SPIKE-RUSH
Synonym: Eleocharis smallii
Coefficient of Conservatism: 5
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Sedge

E. smallii of Michigan Flora.

In almost all kinds of wet places; especially common in shallow water of marshes and along marshy shores and river margins; also in bogs, wet meadows, swamp borders, etc.

Plants with slender culms and small achenes are rather easily confused with E. erythropoda, but large robust plants are easily recognized. The summits of the leaf sheaths in E. palustris tend to be blacker than the merely darkened ones of E. erythropoda. The tubercle ranges from dome-shaped (no longer than broad) to elongate in both species, though tending to be shorter and more conical in E. erythropoda. The circumpolar E. mamillata could well occur in the Lake Superior region. It has perianth bristles mostly 5–6 (–8) and averaging longer than achenes (tubercles included); E. palustris has perianth bristles absent or up to 4 (–5) and usually shorter than achene plus tubercle.

Locations

Alcona County
Alger County
Alpena County
Antrim County
Baraga County
Barry County
Benzie County
Berrien County
Branch County
Calhoun County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Clinton County
Crawford County
Delta County
Dickinson County
Emmet County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia County
Iron County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Leelanau County
    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
Missaukee County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oakland County
Ogemaw County
Ontonagon County
Oscoda County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Schoolcraft County
St. Clair County
Washtenaw County
Wayne County
Wexford County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 11, 2017. http://www.michiganflora.net/species.aspx?id=1115.