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
Allegan County
Berrien County
Calhoun County
Cass County
Charlevoix County
    Only on Beaver Island
Cheboygan County
Chippewa County
Clinton County
Grand Traverse County
Gratiot County
Hillsdale County
Ingham County
Jackson County
Kalamazoo County
Kent County
Leelanau County
    Only on Fox Islands
    Including Manitou Islands
Livingston County
Mackinac County
    Only on Bois Blanc, Mackinac, Round Islands
Mason County
Missaukee County
Muskegon County
Oakland County
Oceana County
Ottawa County
Schoolcraft County
Washtenaw County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 13, 2017. http://www.michiganflora.net/species.aspx?id=174.