Abstract
In 1753, Carolus Linnaeus described tansy ragwort, Senecio jacobaea, in Species Plantarum. This species is a member of the largest genus of the sunflower family (Asteraceae), which encompasses 1300 genera and 21 000 species worldwide. Taxa in the genus Senecio L. range from herbs to shrubs and occur globally. Comparatively few senecios are of economic importance and many of them are weeds, among them tansy ragwort, which can infest pastures, crowding out more desirable forage and poisoning grazing livestock.
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