1. 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
   "pyrethrums brought early colour to the spring border";
   - painted daisy, Tanacetum coccineum, Chrysanthemum coccineum
    
2. White-flowered pyrethrum of Balkan area whose pinnate leaves are white and silky-hairy below; source of an insecticide; sometimes placed in genus Chrysanthemum
   "They grew pyrethrum as a natural pest control";
   - Dalmatian pyrethrum, Dalmatia pyrethrum, Tanacetum cinerariifolium, Chrysanthemum cinerariifolium
    
3. A natural insecticide made from dried chrysanthemum flowers
   "Pyrethrum is used as a natural insecticide"

1. Used in former classifications for plants later placed in genus Chrysanthemum and now often included in genus Tanacetum
   - genus Pyrethrum

Derived forms: pyrethrums

Type of: asterid dicot genus, flower, herb, herbaceous plant, insect powder, insecticide

Part of: aster family, Asteraceae, Compositae, family Asteraceae, family Compositae, genus Tanacetum, Tanacetum

Encyclopedia: Pyrethrum