Catalogue › FlowersRagweed (Ambrosia)Every species of the genus Ambrosia in the catalogue.Lanceleaf ragweed (Ambrosia bidentata)Coastal ragweed (Ambrosia hispida)Cuman ragweed (Ambrosia psilostachya)Dwarf bur ragweed (Ambrosia pumila)Slimleaf bur ragweed (Ambrosia tenuifolia)Great ragweed (Ambrosia trifida)Roman Wormwood (Ambrosia artemesiifolia)