Senecio vulgaris L.
Common Name: COMMON GROUNDSEL
Coefficient of Conservatism: *
Coefficient of Wetness: 3
Wetness Index: FACU
Physiognomy: Ad A-Forb

This is the commonest, Old World, pinnatifid-leaved, weedy groundsel in Michigan. It has evidently been long established here, having been collected as early as 1838 from a roadside in Calhoun Co. Now a local weed in gardens, lawns, nurseries, and cultivated fields; in disturbed sites, including sidewalk cracks, parking lots, bulldozed areas, shores. In sheltered areas by buildings it may bloom virtually year-round.

The involucre in this species and S. sylvaticus are ca. (4–) 6–7 mm long, generally a bit longer than in Jacobaea vulgaris and about the same length as the native S. eremophilus Richardson, which has bracteoles almost as long as the primary phyllaries, conspicuous rays, and has been collected at Thunder Bay, Ontario, and thus could be found in Michigan.

Locations

Alpena County
Baraga County
Bay County
Berrien County
Calhoun County
Cheboygan County
Chippewa County
Clare County
Crawford County
Emmet County
Gogebic County
Hillsdale County
Houghton County
Ingham County
Iosco County
Iron County
Isabella County
Kent County
Keweenaw County
Lenawee County
Mackinac County
    Including Bois Blanc, Mackinac, Round Islands
Macomb County
Marquette County
Mecosta County
Montcalm County
Newaygo County
Oakland County
Oscoda County
Ottawa County
Saginaw County
Sanilac County
Schoolcraft County
St. Clair County
Tuscola 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=442.