Lycopus uniflorus Michx.
Coefficient of Conservatism: 2
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Usually in habitats similar to those of our other common species, L. americanus, and often growing with or near it; shores, swamps (cedar, tamarack, hardwoods); wet prairies, fens, bogs; ditches, borrow pits, ponds; wet thickets, meadows, stream banks.

Some calyx lobes, especially on fruiting material, may be as long as 1.4 mm but still without exceeding the nutlets.

Specimens from Gratiot and Huron Cos. have been annotated as L. ×sherardii E. S. Steele, a hybrid with L. virginicus; these look like robust L. uniflorus although the ends of the nutlets are a bit more toothed than usual. One specimen from Muskegon Co. and one from Ontonagon Co. appear to be similar and in each case both species were also present nearby.  A collection from Lenawee Co. (R. W. Smith 1900 in 1986, MICH) has the short calyx lobes of L. uniflorus but smooth nutlets (and pinnatifid lower leaves) of L. americanus and is presumably a hybrid. Some collections from Monroe Co. (E. G. Voss 14902 in 1976, MICH; A. A. Reznicek 7839 in 1986, MICH, MSC) have the vegetative aspect of L. asper but the calyx and nutlets of L. uniflorus.


Alcona County
Alger County
Allegan County
Alpena County
Arenac County
    Including Charity Island
Baraga County
Barry County
Bay 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
Emmet County
Genesee County
Gladwin County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Iosco County
Iron County
Isabella County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Manistee County
Marquette County
Mason County
Mecosta County
Menominee County
Midland County
Missaukee County
Monroe County
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Oscoda County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Sanilac County
Schoolcraft County
St. Clair County
St. Joseph County
Van Buren County
Washtenaw County
Wayne County
Wexford County


MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 3, 2022.