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Saint John's wort is the plant species Hypericum perforatum, and is also known as Tipton's weed, chase-devil, or Klamath weed. With qualifiers, St John's wort is used to refer to any species of the genus Hypericum. Therefore, H. perforatum is sometimes called common St John's wort to differentiate it. St John's wort is widely known as an herbal treatment for mild forms of depression.