Persicaria maculosa Gray
Common Name: HEART'S-EASE, LADY'S-THUMB
Synonym: Polygonum persicaria
Coefficient of Conservatism: *
Coefficient of Wetness: 0
Wetness Index: FAC
Physiognomy: Ad A-Forb

Persicaria maculosa B. S. Walters

Polygonum persicaria of Michigan Flora.

A widespread weed, naturalized from Europe, more common in disturbed habitats (gardens, roadsides, etc.) and in drier ground than customary for P. pensylvanica and P. lapathifolia, but in many places grows with them: moist or dry disturbed ground, shores, fields, ditches, borders of marshes. First collected as long ago as 1838 in Van Buren Co.

There is usually a dark blotch in the middle of the leaf, but such a mark is also found at times in other species, e.g., P. lapathifolia and P. hydropiperoides.

Locations

Alger County
Allegan County
Antrim County
Arenac County
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
Dickinson County
Emmet County
Genesee County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Ingham County
Iosco County
Iron County
Isabella County
Jackson County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
Lapeer County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Lenawee County
Livingston County
Mackinac County
Macomb County
Marquette County
Mason County
Mecosta County
Menominee County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Ottawa County
Roscommon County
Saginaw County
Sanilac County
Schoolcraft County
Shiawassee County
St. Clair County
Van Buren County
Washtenaw County
Wayne County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 13, 2017. http://michiganflora.net/species.aspx?id=2286.