Hypericum patulum, known as goldencup St. John's wort or yellow mosqueta, is a species of flowering plant in Hypericum sect. Ascyreia.
Hypericum patulum was originally described by Carl Peter Thunberg in 1784. It was first published in Systema Vegetabilium later that year by Johan Andreas Murray.The species has a sporophytic and gametopythic chromosome count of 18 each.
Hypericum patulum has 5 accepted variants as subordinate taxa:
H. patulum var. attenuatum Choisy 1824
H. patulum var. forrestii ...
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