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