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,
widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States 同义词：oxtongue, bristly oxtongue, bugloss, Picris echioides,
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