Bitterweed - Definition
bitterweed
n 1: widespread European weed with spiny tongue-shaped leaves
and yellow flowers; naturalized in United States [syn:
oxtongue, bristly oxtongue, bitterweed, bugloss,
Picris echioides]
2: 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: ragweed, ambrosia, bitterweed]