| oxtongue | (n) widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States, Syn. bristly oxtongue, Picris echioides, bitterweed, bugloss |
| ragweed | (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, Syn. bitterweed, ambrosia |
| Bitterweed | n. (Bot.) A species of |