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Pyrethrum, any of a group of flowers (genus Chrysanthemum) that produce insect powder. Similar in appearance to the daisy, pyrethrums have stems measuring up to 1 ft (30 cm). The insecticide is developed from the powdered or dried flowers and is considered one of the least harmful to humans and animals. Kenya is the world's chief exporter of pyrethrum.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Providence to Rafflesia