ragwort

noun

1. (countable, uncountable)Any of a number of wild flowering plants with yellow flowers in the family Asteraceae, mostly belonging to Senecio and related genera.

   “Ragwort is under the command of dame Venus, and cleanses, digests and discusses.”

   “Sea-poppies and ragwort were plants of ill-fame, too.”

   “As we all know, witches ride through the air on a broom, but sometimes their means of locomotion was a bulrush, a branch of thorn, mullein stalks, cornstalk, or ragweed, called fairies' horse in Ireland.”