It is a common plant on the grounds of low and medium altitude. It is an herb native to Europe, which has become naturalized in America and Australia. The flower petals are golden yellow with small black spots on its edges, the Latin appellation (perforatum) comes from small holes -in fact they are essentially pockets of oil that can be seen against the light in each of the leaves of this plant. They are twice as long as the sepals. A peculiarity of this herb is that, by crushing between the fingers some of its leaves, leaves a stain on the skin, orange sap.