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Common St. John’s Wort
Hypericum perforatum

Other Names: N/A

  • Hypericaceae – St. John’s Wort family
  • 2-2.5 cm (3/4-1 inch) head
  • 5 golden-yellow petals with black dots near edges
  • multiple stamens in groups of 3
  • 3 separate styles
  • arranged in forking clusters at the end of branches
  • 2.5-5 cm (1-2 inches) long in opposite arrangement
  • has translucent dots
  • in many parts of North America, not in far north, southeast or southwest
  • in fields, along roads, and in distressed areas
Flowering Time
  • June - September
  • exotic from Europe; plant can grow to be 30-60 cm (1-2 feet) tall
  • may cause dermatitis in some grazing animals
  • used for medicinal purposes, but may increase sun sensitivity
Name Origin
  • This family is said to bloom on June 24, Saint John’s Eve, giving this family its common name.
Common St. John's Wort flower

St. John's Wort Leaves