Definitions
1.NounAny plant in the genus Ambrosia, especially Ambrosia artemisiifolia (common ragweed).
2.NounThe plant Helenium amarum (yellow sneezeweed).
3.NounParthenium hysterophorus (false ragweed)
4.NounArtemisia tripartita subsp. tripartita (syn. Artemisia trifida; threetip sagebrush)
5.NounPicris rhagadioloides (syn. Picris sprengeriana; tall oxtongue)
6.NounTetraneuris spp.