widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States
同义词：oxtongue??/??bristly oxtongue??/??bugloss??/??Picris echioides
any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
同义词：ragweed??/??ambrosia
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