- any composite plant of the genus Centaurea, especially the weedy C. nigra, having rose-purple flowers set on a dark-colored, knoblike bract.
Origin of knapweed
Also called hardheads, Spanish button.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for knapweed
The seeds of brook-lime, flax, and knapweed the twite seems partial to, and this wild-weed field is to them a very paradise.Poachers and Poaching
The moth is out in July and in August, and may often be seen resting on the flowers of knapweed (Centaurea) in the daytime.The Moths of the British Isles, First Series
The knapweed was stunted and the scabious blooms drooped towards the dusty pasture.Sinister Street, vol. 1
C15 knopwed; see knop, weed 1