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feverfew, Tanacetum parthenium, Chrysanthemum parthenium | bushy aromatic European perennial herb having clusters of buttonlike white-rayed flower heads; valued traditionally for medicinal uses; bushy aromatic European perennial herb having clusters of buttonlike white-rayed flower heads; valued traditionally for medicinal uses; sometimes placed in genus Chrysanthemum ❲Tanacetum parthenium, Chrysanthemum parthenium❳ |