Hypericum tetrapterum
(redirected from Square-stalked St John's-wort)Also found in: Thesaurus.
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| Noun | 1. | Hypericum tetrapterum - European perennial St John's wort; Ireland and France to western Siberia St John's wort - any of numerous plants of the genus Hypericum having yellow flowers and transparently dotted leaves; traditionally gathered on St John's eve to ward off evil |