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Pyrethrum was a genus of several Old World plants now classified in either Chrysanthemum or Tanacetum which are cultivated as ornamentals for their showy flower heads. Pyrethrum continues to be used as a common name for plants formerly included in the genus Pyrethrum .
Pyrethrin I is a derivative of (+)-trans-chrysanthemic acid. [12] [13] Pyrethrin II is closely related, but one methyl group is oxidized to a carboxymethyl group, the resulting core being called pyrethric acid.
Tanacetum cinerariifolium is a species of flowering plant in the aster family, Asteraceae, [1] and formerly part of the genus Pyrethrum, but now placed in the genus Chrysanthemum, or the genus Tanacetum by some biologists. It is called the Dalmatian chrysanthemum or Dalmatian pyrethrum, denoting its origin in that region of Europe (Dalmatia ...
Chemical structure of Allethrin isomers Chemical structure of Permethrin isomers. A pyrethroid is an organic compound similar to the natural pyrethrins, which are produced by the flowers of pyrethrums (Chrysanthemum cinerariaefolium and C. coccineum).
Pyrethrum parthenium Sm. Tanacetum parthenium , known as feverfew , [ 1 ] is a flowering plant in the daisy family, Asteraceae . It may be grown as an ornament , and may be identified by its synonyms, Chrysanthemum parthenium and Pyrethrum parthenium .
Pyrethrin and pyrethroids are used indoors, in gardens and the horticulture industry, and in agriculture. It is produced from the powdered flowers of certain species of pyrethrum, plants in the genera Chrysanthemum and Tanacetum. In more recent times it has had formulations with brand names such as Zacherlin. [3]
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