knapweed

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.