Cardamine pratensis L.
Common Name: CUCKOO-FLOWER
Coefficient of Conservatism: 10
Coefficient of Wetness: -5
Wetness Index: OBL
Physiognomy: Nt P-Forb

Cardamine pratensis A. A. Reznicek

Fens, wet meadows, lakeshores, on logs and hummocks in marshy ground, borders of forest pools and streams, tamarack and cedar swamps; typically in undisturbed wetlands and often in shallow, cold water.

An attractive spring-flowering plant found around the world in northern latitudes. Our plants are almost all native, the var. palustris Wimmer & Grab. (or subsp. palustris (Wimmer & Grab.) Clausen), now often recognized as Cardamine dentata Schult. This has pure white flowers, drying to pale brown, middle cauline leaves with the leaflets narrowed to a more or less distinct petiolule, and the enlarged terminal leaflets of the basal leaves with inconspicuous callus tips on the vein ends, these tips not excurrent and usually wider than long.

The European plant, var. pratensis, is occasionally cultivated, and a single wild collection is known, from along the St. Mary's River in Chippewa Co. (Voss 15286 in 1980). This has usually pink to purple flowers, drying pinkish, middle cauline leaves with the leaflets essentially sessile, and clearly excurrent callus on the enlarged terminal leaflets of the basal leaves, this callus often more or less pointed and sometimes longer than wide.

Locations

Alcona County
Barry County
Benzie County
Berrien County
Calhoun County
Cass County
Cheboygan County
Chippewa County
Crawford County
Delta County
Eaton County
Emmet County
Gogebic County
Gratiot County
Hillsdale County
Ingham County
Ionia County
Isabella County
Jackson County
Kalamazoo County
Kent County
Lake County
Leelanau County
Lenawee County
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Marquette County
Mecosta County
Newaygo County
Oakland County
Roscommon County
Sanilac County
St. Clair County
Washtenaw County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. June 24, 2018. https://www.michiganflora.net/species.aspx?id=633.