1. A weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized
   - lesser knapweed, black knapweed, hardheads

Type of: knapweed

• roll-on roll-off
• roll-top
• roll-top desk
• rollback
• rolled
• rolled biscuit
• rolled into one
• rolled oats
• roller
• roller bandage
• roller bearing
• roller bit
• roller blind
• roller coaster
• roller skate
• roller skating
• roller towel
• roller-skater
• Rollerblade
• rollerblader
• rollerblading
• rollick
• rollicking
• rollickingly
• rolling