Lathyrus palustris L.
Common Name: MARSH PEA
Coefficient of Conservatism: 7
Coefficient of Wetness: -3
Wetness Index: FACW
Physiognomy: Nt P-Vine

Moist thickets, shores, beach flats, marshes, fens, wet meadows, conifer swamps (cedar or tamarack), stream and river banks, ditches and swales, borders of forests.

Variable in size and shape of leaflets and stipules, in pubescence, and in other characters. The several named varieties all run into each other. One of the clearest is var. myrtifolius (Willd.) A. Gray, with the stem wingless. Other forms have the stem narrowly winged, and it is mostly among these plants that rare ones occur with stipules more than 7 mm broad. These can usually also be distinguished from the wingless L. ochroleucus by their bluish to pink or purple flowers (except in albinos) and the often ± sharply acute basal lobes on the stipules (compared to rather rounded, though toothed, lobes in L. ochroleucus).

Locations

Alcona County
Allegan County
Alpena County
Antrim 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
Clinton County
Delta County
Dickinson County
Eaton County
Emmet County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Ingham County
Iosco County
Jackson County
Kalamazoo County
Kent County
Keweenaw County
    Including Isle Royale
Leelanau County
    Including Fox 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
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oakland County
Ottawa County
Presque Isle County
Roscommon County
Schoolcraft County
Shiawassee County
St. Clair County
St. Joseph County
Tuscola 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 17, 2017. http://www.michiganflora.net/species.aspx?id=1311.