Chrysolina hyperici is a species of leaf beetle commonly known as the St. John's Wort beetle. It is characterized by its vibrant metallic green coloration and its small size, typically measuring around 6-8 millimeters in length. This beetle is native to Europe and is known to feed exclusively on St. John's Wort plants (Hypericum perforatum). It plays an important role in controlling the growth of this invasive plant species.