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Common Name:
KLAMATH WEED, GOATWEED, COMMON ST. JOHN'S-WORT
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Coefficient of Conservatism:
*
Coefficient of Wetness:
5
Wetness Index:
UPL
Physiognomy:
Ad P-Forb
R. W. Smith
Abundant on fields, roadsides, and railroads; spreading to rock outcrops, shores, and elsewhere. A thoroughly naturalized weed, originally from Europe. First collected in Michigan in 1839 by D. Cooley in Macomb Co.
Although other species of Hypericum are also poisonous if ingested, this abundant species has been an important livestock-poisoning plant, especially in western North America. One of its properties is to make animals hypersensitive to light.
This species is much less black-spotted than H. punctatum, but it does have prominent translucent dots in the leaves. The stem is angled (compared to terete in H. punctatum); a ridge extends downward from the base of the midrib of each leaf.
Locations
Alcona County
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Alger County
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Allegan County
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Alpena County
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Antrim County
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Arenac County
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Baraga County
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Barry County
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Benzie County
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Berrien County
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Branch County
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Calhoun County
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Cass County
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Charlevoix County
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Including Beaver Island
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Cheboygan County
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Chippewa County
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Including Drummond Island
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Clare County
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Clinton County
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Crawford County
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Delta County
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Dickinson County
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Emmet County
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Genesee County
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Gladwin County
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Gogebic County
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Grand Traverse County
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Hillsdale County
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Houghton County
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Huron County
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Ingham County
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Ionia County
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Iron County
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Isabella County
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Jackson County
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Kalamazoo County
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Kalkaska County
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Kent County
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Keweenaw County
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Including Isle Royale
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Lake County
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Lapeer County
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Leelanau County
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Including Fox Islands
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Including Manitou Islands
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Lenawee County
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Livingston County
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Luce County
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Mackinac County
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Including Bois Blanc, Mackinac, Round Islands
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Macomb County
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Manistee County
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Marquette County
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Mason County
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Mecosta County
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Menominee County
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Missaukee County
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Monroe County
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Montcalm County
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Montmorency County
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Muskegon County
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Newaygo County
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Oakland County
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Oceana County
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Ogemaw County
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Ontonagon County
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Oscoda County
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Otsego County
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Ottawa County
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Presque Isle County
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Roscommon County
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Saginaw County
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Sanilac County
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Schoolcraft County
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Shiawassee County
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St. Clair County
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St. Joseph County
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Tuscola County
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Van Buren County
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Washtenaw County
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Wayne County
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Wexford County
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Citation:
MICHIGAN FLORA ONLINE. A. A. Reznicek, E. G. Voss, & B. S. Walters. February 2011. University of Michigan. Web. January 29, 2023. https://michiganflora.net/species.aspx?id=1465.