What is a perennial plant (Pyrethrum, or Chrysanthemum, Parthenium) allied to camomile, having finely divided leaves and white blossoms; -- so named from its supposed febrifugal qualities called?

feverfew — A perennial plant (Pyrethrum, or Chrysanthemum, Parthenium) allied to camomile, having finely divided leaves and white blossoms; -- so named from its supposed febrifugal qualities. (Webster's 1913.)

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