noun
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.
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