some of a number of old-world plants regarding the genus Chrysanthemum, particularly C. coccineum, cultivated for their showy flower heads.
An insecticide produced from the dried flower heads of Chrysanthemum cinerariifolium or C. coccineum.
any one of several perennial African flowers associated with the genus Chrysanthemum, particularly Chrysanthemum cinerariaefolium
some of a number of pesticides gotten because of these plants; pyrethrin
A plant of the genus Pyrethrum; feverfew.
[capitalized] A former genus of composite flowers of this tribe Anthemideæ, now included within the section Pyrethra within the genus Chrysanthemum, from where it was distinguished by achenes almost equally from five- to ten-ribbed and crowned with a pappus, figures now known to vary in the same types.
A powdered preparation of pyrethrum, made use of as an insectifuge. Also referred to as pyrethrum-powder. See insect-powder and buhach.
In pharmacy, the Anacyclus Pyrethrum, or pellitory-of-Spain.
made from dried rose minds of pyrethrum plants
white-flowered pyrethrum of Balkan location whoever pinnate leaves are white and silky-hairy below; source of an insecticide; occasionally put in genus Chrysanthemum
found in former classifications for flowers later put in genus Chrysanthemum and now usually incorporated into genus Tanacetum
spring-flowering garden perennial of Asiatic source having carefully divided aromatic leaves and white to pink-purple blossoms; source of an insecticide; sometimes placed in genus Chrysanthemum