St. JohnswortSt. Johns·wort
any of a genus (Hypericum) of ornamental plants of the St. Johnswort family, with usually yellow flowers and numerous stamens
Origin of St. Johnswortafter Saint John + wort: reason for name uncertain
designating a family (Guttiferae, order Theales) of dicotyledonous trees, shrubs, and plants used for timber, in drugs, etc.
Also written St-John's-wort, St. John's wort