Any of several aromatic chrysanthmums of genus Tanacetum, esp. T. Coccineum. Also an insecticide made from the dried leaves of these plants, esp. Tanacetum cinerariifolium.

made of dried flower heads of pyrethrum plants

white-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum

spring-flowering garden perennial of Asiatic origin having finely divided aromatic leaves and white to pink-purple flowers; source of an insecticide; sometimes placed in genus Chrysanthemum

used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum

A natural insecticide made from several insecticides called pyrethrins. Pyrethrum powder is produced from the flower heads of two species of chrysanthemum grown in the highlands of Africa, South America, and southeast Asia; low toxicity to people and pets.

Natural insecticide made from the blossoms of various chrysanthemums. Pyrethrum is the most effective natural spider mite exterminator.

Pyrethrum refers to several Old World plants of the genus Chrysanthemum (e.g., C. coccineum) which are cultivated as ornamentals for their showy flower heads. It is also the name of a natural insecticide made from the dried flower heads of C. cinerariifolium and C. coccineum. Some members of Chrysanthemum, including these two, are placed in another genus, Tanacetum, by some authorities.