St John's wort
noun
1- a herbaceous plant or shrub with distinctive yellow five-petalled flowers and paired oval leaves金丝桃。
1.1
- Genus Hypericum, family Guttiferae: many species.金丝桃属, 藤黄科：多种。
词源
so named because some species come into flower near the feast day of St John the Baptist (24 June).