St. John's wort (Hypericum perforatum)

Has yellow flowers at the top of the stem in the head is broom. The fruit is tree-shaped box. Blossoms in May - September. It is distributed throughout the country in grassy areas around bushes and fellings, and around the fields. There are about 22 species of this herb. The upper-surface part is used, which is collected at the beginning or during the time of flowering.
Contains essential oils, tanning substances, resins, carotene, etc.