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Hypericum perforatum, known as perforate St John's-wort,[1] is a flowering plant in the family Hypericaceae and the type species of the genus Hypericum. Possibly a hybrid between H. maculatum and H. attenuatum, the species can be found across temperate areas of Eurasia and has been introduced as an invasive weed to much of North and South America, as well as South Africa and Australia. While the species is harmful to livestock and can interfere with prescription drugs, it has ... [wikipedia]