Geranium robertianum L.
Common Name: HERB ROBERT
Coefficient of Conservatism: 3
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Nt A-Forb

Rich deciduous forests (oak-hickory or more often beech-maple), especially in clearings, along roads and trails, and at borders; rocky openings, gravelly shores, generally a calciphile; rarely associated with cedar. A circumpolar species, presumably native in our area although sometimes occurring in disturbed places. Sometimes considered introduced in western North America.

 

Reported by the First Survey, though no specimens appear to have survived; the first collection in Michigan dates from 1860, on Mackinac Island, and for some years, almost all of the collections were from or near the shores of the Great Lakes, especially northwards and on Islands. The first collection from an inland County in southern Michigan was by Emma Cole in Kent Co., in 1898, but only more recently has it been found widely inland and throughout southern Michigan, so it appears to have expanded its range in the state. Recent occurrences as an annoying weed in gardens and other urbanized and dirturbed sites may well represent plants more recently introduced, perhaps from Europe. The whole plant has a strong and rather unpleasant scent, quite evident especially after specimens have been shut in a confined space, not entirely unlike that of Solanum dulcamara.

 

Locations

Alger County
Allegan County
Alpena County
Antrim County
Barry County
Benzie County
Berrien County
Calhoun County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Delta County
Eaton County
Emmet County
Grand Traverse County
Hillsdale County
Huron County
Ionia County
Kalamazoo County
Kalkaska County
Kent County
Keweenaw County
Lake County
Leelanau County
    Including Fox Islands
    Including Manitou Islands
Livingston County
Luce County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Manistee County
Marquette County
Mason County
Mecosta County
Missaukee County
Monroe County
Montcalm County
Muskegon County
Newaygo County
Oakland County
Oceana County
Osceola County
Otsego County
Ottawa County
Presque Isle County
Sanilac County
Schoolcraft County
St. Clair County
Van Buren County
Washtenaw County
Wayne County
Wexford County

Citation:

MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. December 13, 2017. http://www.michiganflora.net/species.aspx?id=1410.