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Feverfew (Tanacetum parthenium; syn. Chrysanthemum parthenium (L.) Pers., Pyrethrum parthenium Sm.) is a traditional medicinal herb which is found in many old gardens, and is also occasionally grown for ornament. The plant grows into a small bush up to around 46 cm (18 in) high, with citrus-scented leaves and is covered by flowers reminiscent of daisies. It spreads rapidly, and they will cover a wide area after a few years. It is also commonly seen in the literature by its synonyms, Chrysanthemum parthenium (L.) Bernh. and Pyrethrum parthenium (L.) Sm.
The word "feverfew" derives from the Latin febrifugia, meaning "fever reducer." It has been used for reducing fever, for treating headaches, arthritis and digestive problems. It is hypothesized that by inhibiting the release of serotonin and prostaglandins, both of which are believed to aid the onset of migraines, feverfew limits the inflammation of blood vessels in the head