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