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Definition of St John's wort
1. Noun. 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.
Group relationships: Genus Hypericum, Hypericum
Specialized synonyms: Common St John's Wort, Hypericum Androsaemum, Tutsan, Great St John's Wort, Hypericum Ascyron, Hypericum Pyramidatum, Creeping St John's Wort, Hypericum Calycinum, Hypericum Gentianoides, Nitweed, Orange Grass, Pine-weed, Pineweed, Hypericum Crux Andrae, St Andrews's Cross, Hypericum Hypericoides, Low St Andrew's Cross, Hypericum Perforatum, Klammath Weed, Hypericum Prolificum, Hypericum Spathulatum, Shrubby St John's Wort, Hypericum Maculatum, Hypericum Tetrapterum, St Peter's Wort, Hypericum Virginianum, Marsh St-john's Wort
Generic synonyms: Subshrub, Suffrutex
Specialized synonyms: Common St John's Wort, Hypericum Androsaemum, Tutsan, Great St John's Wort, Hypericum Ascyron, Hypericum Pyramidatum, Creeping St John's Wort, Hypericum Calycinum, Hypericum Gentianoides, Nitweed, Orange Grass, Pine-weed, Pineweed, Hypericum Crux Andrae, St Andrews's Cross, Hypericum Hypericoides, Low St Andrew's Cross, Hypericum Perforatum, Klammath Weed, Hypericum Prolificum, Hypericum Spathulatum, Shrubby St John's Wort, Hypericum Maculatum, Hypericum Tetrapterum, St Peter's Wort, Hypericum Virginianum, Marsh St-john's Wort
Generic synonyms: Subshrub, Suffrutex