knapweed

Alteration of knopweed. This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term.

• IPA^(key): /ˈnæpwiːd/

knapweed (countable and uncountable, plural knapweeds)

1. Any of various common weeds of the genus Centaurea
   1. especially Centaurea nigra.

• clubweed

• bighead knapweed (Centaurea macrocephala)
• black knapweed (Centaurea nigra)
• brown knapweed (Centaurea jacea)
• common knapweed (Centaurea nigra)
• diffuse knapweed (Centaurea diffusa)
• giant knapweed (Centaurea macrocephala)
• great knapweed (Centaurea scabiosa)
• greater knapweed (Centaurea scabiosa)
• Jersey knapweed (Centaurea paniculata)
• lesser knapweed (Centaurea nigra)
• Russian knapweed (Rhaponticum repens)
• singleflower knapweed (Centaurea uniflora)
• slender knapweed (Centaurea spp.)
• spotted knapweed (Centaurea maculosa)
• squarrose knapweed (Centaurea virgata ssp. squarrosa)
• tumble knapweed (Centaurea diffusa)
• white knapweed (Centaurea diffusa)

• knapweed on Wikipedia.Wikipedia
• “knapweed”, in OneLook Dictionary Search.