Lemna minor L.
Common Name: COMMON DUCKWEED
Coefficient of Conservatism: 5
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Floating on the surface of standing, even stagnant water of lakes, ponds, borders of streams, quiet backwaters, floodings, etc. Sometimes stranded on wet shores after lowering of water levels.

While there is no doubt that they are biologically distinct entities, Lemna minor and L. turionifera are very similar to each other, and can sometimes be essentially impossible to distinguish in the herbarium. Both occur nearly throughout the state, though L. minor is evidently less common northwards. Michigan material suggests that L. minor is often a paler green and perhaps slightly larger on average than L. turionifera (largest plant bodies seen only rarely more than ca. 3.5 (–4) mm long, while L. minor collections were seen up to 5.2 mm long).

Locations

Alcona County
Alger County
Allegan County
Antrim County
Arenac County
Baraga County
Berrien County
Branch County
Calhoun County
Cass County
Charlevoix County
Cheboygan County
Chippewa County
Clinton County
Crawford County
Delta County
Dickinson County
Gladwin County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Ingham County
Iron County
Isabella County
Jackson County
Kalamazoo County
Kent County
Lake County
Lapeer County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Manistee County
Marquette County
Mason County
Mecosta County
Missaukee County
Monroe County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Oscoda County
Ottawa County
Roscommon County
Saginaw County
Schoolcraft County
St. Joseph County
Tuscola County
Washtenaw County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. November 15, 2019. https://michiganflora.net/species.aspx?id=174.