There are many species of St John’s wort but the leaves and stem of this one most closely resembles square-stalked St John’s wort (Hypericum tetrapterum). This Hypericum favours damp ground. I photographed it in the middle clearing which is not particularly damp but locally variable due to holes of old tree stumps.
The herbal remedy of St John’s wort is extracted from the flowers and leaves of common St John’s wort (Hypericum perforatum). It has been used over the centuries as a traditional medicine for wound healing and mental health problems.