Engelsk definition
An annual species in the family ASTERACEA, genus Parthenium which sometimes is referred to as feverfew, not to be confused with the medicinal herb often cultivated in the garden, TANACETUM PARTHENIUM. Parthenium hysterophorus is an invasive allelopathic weed indigenous to the Caribbean, Central and South America and has similar rosette stage structures as COMMON RAGWEED. It contains sesquiterpene lactones including parthenin which is poisonous to grazing animals and allergenic and irritant, causing Parthenium dermatitis in humans.