Rumex crispus L.
Coefficient of Conservatism: *
Coefficient of Wetness: 0
Wetness Index: FAC
Physiognomy: Ad P-Forb

A European native, well known as a common and troublesome tap-rooted weed across North America. Collected by D. Cooley as early as 1837, probably in Macomb Co., and now found throughout in both moist and dry ground, thriving in disturbed places, along roadsides, in fields, and also in more natural habitats such as streamsides, in clearings in swamps and forests, and on shores.

Many of our plants have a well-developed “grain” on only 1 of the 3 inner tepals [f. unicallosum Peterm.] The inner tepals vary from entire to shallowly toothed, both types of margin often being found on the same plant, sometimes even on the same fruit. Hybrids with R. obtusifolius [R. ×pratensis Mert. & W. D. J. Koch] occur occasionally. Apparent hybrids have been seen from Berrien, Houghton, Ingham, and Macomb Cos. and North Manitou Island (Leelanau Co.), and doubtless occur elsewhere.


Alcona County
Alger County
Allegan County
Alpena County
Antrim County
Arenac County
Baraga County
Barry County
Benzie County
Berrien County
Calhoun County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Clinton County
Crawford County
Delta County
Dickinson County
Emmet County
Gladwin County
Gogebic County
Gratiot County
Hillsdale County
Houghton County
Huron County
Ingham County
Ionia County
Iosco County
Isabella County
Jackson County
Kalamazoo County
Kent County
Keweenaw County
    Including Isle Royale
Lake County
Lapeer 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
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Saginaw County
Sanilac County
Schoolcraft 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. September 24, 2022.