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knapweed Definition

knap·weed (napwēd′)

noun

any of several weedy plants (genus Centaurea) of the composite family; esp., a hardy perennial (C. nigra) with heads of rose-purple flowers

Etymology: earlier knopweed: see knop & weed

knapweed Usage Examples

Adjective modifier

  • black: Look out for wild carrot, white clover, weld, ragwort, thistle and black knapweed.
  • common: The flowerheads of greater knapweed have long rays which are lacking in common knapweed.
  • great: The flowerheads of greater knapweed have long rays which are lacking in common knapweed.
  • lesser: Lesser knapweed grows in grassland where its reddish-purple thistle-like flowers appear from July to September.
  • spotted: Dave Burch, the state's weed coordinator, estimated spotted knapweed costs the state's economy $ 42 million a year.

Modifies a noun

broomrape: The reserve also boasts probably the largest numbers of the parasitic knapweed broomrape anywhere in the county.

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