Species: 

Hypericum perforatum

Common Name(s): 

common St. Johnswort, St. John's wort, Klamath weed

Habitats Impacted: 

rangeland, disturbed/waste areas

Regions likely to be Impacted: 

NE, NW

Present in Neighboring States?

AR, CO, KS, LA, MO, NM, TX

Currently known from Oklahoma?

Yes

Hypericum perforatum

Steve Dewey, Utah State University, Bugwood.org

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What you should know!

Crowds out native species. Toxic to livestock. has been shown to cause hyper photosensitivity. A seed or hay contaminant. Used medicinally.

Management information