Coefficient of Conservatism:
5
Coefficient of Wetness:
-5
Wetness Index:
OBL
Physiognomy:
Nt P-Forb
G. E. Crow
Lakes and rivers; also ditches, ponds, bogs; usually in fairly shallow water (to 1.5 m) but recorded at depths to 3.7 m.
This species almost never fails to produce floating leaves, and can hardly be confused with any other (but see comments under P. oakesianus). Upper portions (lacking submersed leaves) of such species as P. nodosus and P. amplifolius with large floating leaf blades may nearly always be distinguished by their rounded or tapered bases. Furthermore, in P. natans the petiole generally has a rather sharp bend and a band of different (lighter) color at the junction with the cordate blade. P. pulcher also has cordate floating leaves, but the fruit is prominently keeled and the broad submersed leaves are generally evident.
Locations
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Alcona County
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Alger County
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Allegan County
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Alpena County
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Antrim County
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Arenac County
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Only on Charity Island
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Baraga County
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Barry County
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Bay County
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Berrien County
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Branch County
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Calhoun County
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Cass County
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Charlevoix County
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Including Beaver Island
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Cheboygan County
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Chippewa County
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Including Drummond Island
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Clare County
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Clinton County
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Crawford County
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Delta County
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Dickinson County
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Eaton County
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Emmet County
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Genesee County
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Gladwin County
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Gogebic County
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Grand Traverse County
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Gratiot County
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Hillsdale County
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Houghton County
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Ingham County
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Ionia County
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Iosco County
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Iron County
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Isabella County
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Jackson County
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Kalamazoo County
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Kalkaska County
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Kent County
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Keweenaw County
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Including Isle Royale
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Lapeer County
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Leelanau County
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Including Manitou Islands
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Lenawee County
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Livingston County
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Luce County
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Mackinac County
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Including Bois Blanc, Mackinac, Round Islands
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Macomb County
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Manistee County
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Marquette County
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Mason County
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Mecosta County
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Menominee County
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Missaukee County
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Monroe County
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Montcalm County
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Montmorency County
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Muskegon County
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Newaygo County
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Oakland County
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Ogemaw County
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Ontonagon County
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Osceola County
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Oscoda County
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Otsego County
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Ottawa County
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Presque Isle County
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Roscommon County
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Schoolcraft County
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St. Clair County
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St. Joseph County
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Van Buren County
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Washtenaw County
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Wayne County
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Wexford County
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Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 18, 2019. https://michiganflora.net/species.aspx?id=2330.