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Scientific Name
Hypericum perforatum L. (ITIS)
Common Name
St. Johnswort, St. John's wort, common St. Johnswort, Klamath weed, common goatweed, tipton weed
Native To
Eurasia and North Africa (Zouhar 2004)
Date of U.S. Introduction
1700s (Zouhar 2004)
Means of Introduction
Introduced as an ornamental and as a medicinal herb (Klein 2011)
Impact
Crowds out native species and forage on pasturelands; toxic to livestock (Klein 2011; Zouhar 2004)
St. Johnswort flower, Alaska
Credit
Photo by Michael Shephard; USDA, Forest Service
Source
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Citations
Integrated Taxonomic Information System. Hypericum perforatum. [Accessed Mar 22, 2015].