Decodon verticillatus (L.) Elliott
Coefficient of Conservatism: 7
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt Shrub

Shallow water and mucky shores of ponds, lakes, marshes, and bogs, sometimes forming floating mats, often grows in very soft substrates.

The stems form an extensive pale spongy cork-like tissue (but soft and formed of cells containing cytoplasm) in the water. This “aerenchyma” forms at the base of the stem and at the tip of an arching stem when it strikes water and roots. The arching stems with enlarged floating tips, sometimes with another low arch developing beyond, are a unique aspect of this loosestrife. 

Though considered a shrub, typically, only the stems below the water line are perennial. 


Alcona County
Allegan County
Antrim County
Barry County
Benzie County
Berrien County
Branch County
Calhoun County
Cass County
Charlevoix County
Cheboygan County
Clare County
Clinton County
Crawford County
Emmet County
Genesee County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Ingham County
Iosco County
Isabella County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Lake County
Lapeer County
Leelanau County
Lenawee County
Livingston County
Mackinac County
Mason County
Mecosta County
Menominee County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oakland County
Osceola County
Otsego County
Ottawa County
Roscommon County
Shiawassee County
St. Clair County
St. Joseph County
Van Buren County
Washtenaw County
Wayne County


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