The plant Helenium amarum (yellow sneezeweed).
Any plant in the genus Ambrosia, especially Ambrosia artemisiifolia (common ragweed).
Parthenium hysterophorus (false ragweed)
Picris rhagadioloides (syn. Picris sprengeriana; tall oxtongue)
Artemisia tripartita subsp. tripartita (syn. Artemisia trifida; threetip sagebrush)
Tetraneuris spp.
A European aromatic perennial herb, Tanacetum parthenium (or Chrysanthemum parthenium or Pyrethrum parthenium), having daisy-like flowers; valued as a traditional medicine, especially for headaches.