1. bitterweed [ Synonyms: bristly oxtongue, bugloss, oxtongue, picris echioides] | |
Widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States
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2. bitterweed [ Synonyms: ambrosia, ragweed] | |
Any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
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