Noun: bitterweed 'bi-tu(r),weed
- Widespread European weed with spiny tongue-shaped leaves and yellow flowers; naturalized in United States
"bitterweed's prickly leaves discouraged grazing animals";
- oxtongue, bristly oxtongue, bugloss, Picris echioides
- Any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
"Bitterweed invaded the neglected field";
- ragweed, ambrosia
Derived forms: bitterweeds
Type of: weed
Part of: genus Ambrosia, genus Picris, Picris
Encyclopedia: Bitterweed