Sparganium emersum Rehm.
Common Name: GREEN-FRUITED BUR-REED
Synonym: Sparganium chlorocarpum
Coefficient of Conservatism: 6
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Sparganium emersum B. S. Walters

S. chlorocarpum of Michigan Flora.

All kinds of moist and wet places: shores, bogs, lakes (in up to 6 dm of water), beach pools, stream borders.

Our most common single-styled species and certainly our most variable species, although only very rarely is the inflorescence branched. The stem is short (much surpassed by leaves) and the heads crowded (usually fewer and smaller) in plants referred to as subsp. acaule (Beeby) C. D. K. Cook & M. S. Nicholls, but the significance of this variation is unclear.

The heads are rarely all axillary in some populations, but such specimens may be placed here by the shiny, rather light green achenes with long ribbed beaks, the ribs extending onto the apical half of the achene (which is often dull and speckled with red on the lower half, below the constriction).

Locations

Alger County
Alpena County
Arenac County
Baraga County
Bay County
Benzie County
Calhoun County
Cass County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Chippewa County
Clare County
Delta County
Dickinson County
Emmet County
Gogebic County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia County
Iosco County
Iron County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Leelanau County
    Including Manitou Islands
Lenawee County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Manistee County
Marquette County
Mecosta County
Menominee County
Missaukee County
Monroe County
Montcalm County
Montmorency County
Muskegon County
Oakland County
Ogemaw County
Ontonagon County
Otsego County
Presque Isle County
Roscommon County
Schoolcraft County
St. Clair County
Van Buren County
Washtenaw County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 12, 2017. http://www.michiganflora.net/species.aspx?id=2741.