bitterweed

Any plant in the genus Ambrosia, especially Ambrosia artemisiifolia (common ragweed).

The plant Helenium amarum (yellow sneezeweed).

Parthenium hysterophorus (false ragweed)

Artemisia tripartita subsp. tripartita (syn. Artemisia trifida; threetip sagebrush)

Picris rhagadioloides (syn. Picris sprengeriana; tall oxtongue)

Tetraneuris spp.