A plant of the genus Centipeda; either of the species Centipeda cunninghami or Centipeda minima, which induce sneezing and are known as a folk remedy for colds and allergic reactions.
A plant of the genus Helenium, especially Helenium autumnale.
Achillea ptarmica, a hardy flowering plant, poisonous to cattle, sheep and horses, but with various herbal applications in humans.