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NCI Dictionary of Cancer Terms

purple coneflower  listen  (PER-pul KONE-flow-er)

  An herb native to North America that has been used to prevent and treat the common cold and other respiratory infections. Purple coneflower may interfere with treatment that uses the immune system to fight cancer. The scientific names are Echinacea purpurea and Echinacea angustifolia. Also called echinacea.