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Hieracium aurantiacum L.
Coefficient of Conservatism: *
Coefficient of Wetness: 5
Wetness Index: UPL
Physiognomy: Ad P-Forb

Occurs almost everywhere: can be colorfully abundant along roadsides and in dry fields, but also invading logged areas, forests, shores, moist pastures, marshy ground, and cedar swamps. Apparently introduced from Europe as a garden ornamental in Vermont by 1875, and soon spread throughout northern New England and beyond. The first Michigan collection is from Alpena Co. in 1895, and it spread rapidly in that part of the state; there are also reports from Lenawee Co. in 1897 and Kent Co. in 1901, so the species may have been introduced ± simultaneously at more than one place in Michigan.

Hybrids with H. piloselloides occur occasionally where both parents are found and can be recognized by the intermediate shade of the ligules and/or by bicolored ligules (red apically, yellow basally). The bicolored aspect is, if anything, intensified in herbarium specimens several years after they were dried. Hybrids with ligule color closer to one of the parents are more likely to be keyed as that parent unless the collector has carefully described the situation on the label. Also, ligules of H. aurantiacum tend to be paler in plants growing in shade. Morphological characters are not very helpful in confirming hybrids. Specimens at least temporarily identified as hybrids are known from Alcona, Alger, Benzie, Cheboygan, Delta, Kalamazoo, Keweenaw, Lenawee, Luce, Mackinac, Schoolcraft, and Washtenaw Cos. A collection from Iosco Co. with bicolored ligules may be H. aurantiacum × H. caespitosum, with very broad, hairy, denticulate leaves.


Alcona County
Alger County
Allegan County
Alpena County
Antrim County
Arenac County
Baraga County
Barry County
Bay County
Benzie County
Berrien County
Calhoun County
Cass County
Charlevoix County
    Including Beaver Island
Cheboygan County
Chippewa County
    Including Drummond Island
Clare County
Clinton County
Crawford County
Delta County
Dickinson County
Eaton County
Emmet County
Genesee County
Gladwin County
Gogebic County
Grand Traverse County
Gratiot County
Hillsdale County
Houghton County
Ingham County
Ionia County
Iosco County
Iron County
Isabella County
Jackson County
Kalamazoo County
Kalkaska 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
Montcalm County
Montmorency County
Muskegon County
Newaygo County
Oakland County
Oceana County
Ogemaw County
Ontonagon County
Osceola County
Oscoda County
Otsego County
Ottawa County
Presque Isle County
Roscommon County
Saginaw County
Sanilac County
Schoolcraft County
Shiawassee 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. January 30, 2023.