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

• Aquarius
• Aquarius the Water Bearer
• aquatic
• aquatic bird
• aquatic fern
• aquatic mammal
• aquatic plant
• aquatic vertebrate
• aquatically
• aquatics
• aquatint
• aquavit
• aqueduct
• aqueductus cerebri
• aqueous
• aqueous humor
• aqueous humour
• aqueous solution
• aquicultural
• aquiculture
• aquifer
• aquiferous
• Aquifoliaceae
• Aquila
• Aquila chrysaetos