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Common St. John's-Wort (Hypericum perforatum)

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Family: CLUSIACEAE
Genus: Hypericum
Species: Common St. John's-Wort (Hypericum perforatum)

Common St. John's-Wort Species Images

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Common St. John's-Wort (Hypericum perforatum)
Common St. John's-Wort (Hypericum perforatum)


Common St. John's-Wort Species Description

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These plants are from foreign areas (those that occur outside of North America north of Mexico) that have been released intentionally or unintentionally. Plants that have been disseminated or escaped as a result of human activity, and become established somewhere within the United States, Canada or Greenland.

Allergenicity: No allergy has been reported for Common St. John's-Wort (Hypericum perforatum) species.

Pollination: Occurs in following seasons depending on latitude and elevation: Spring to Fall.

Angiosperm - Flowering Dicot: Plants in this group have two embryonic leaves (dicotyledons). Examples of dicotyledons are beans, buttercups, oaks, sunflowers, etc.

Forb: A broad-leaved herb other than a grass, especially one growing in a field, prairie, or meadow.

Weed: Any plant growing in cultivated ground to the injury of the crop or desired vegetation, or to the disfigurement of the place; an unsightly, useless, or injurious plant.

Perennial: Living for many years.

State Noxious Weed: unpleasant and possibly also harmful.

Herbaceous Stem: Not woody, lacking lignified tissues.

Common St. John's-Wort Species Usage

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Pharmacological: Used in medicine or pharmacological research.

Dye: Used as a colored dye.

Honey/Bee Pollen: A plant used as a source of food for Honey Bees, and may be a flavor of honey such as clover or alfalfa.

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Common St. John's-Wort Species Location

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The shaded areas on the map indicates where the species has been observed in the United States. Click the map to see a full scale version of these allergy areas.
  - Native, observed in a county
  - Introduced, observed in a county
  - Rarely observed
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