WordNet
greater knapweed
n. tall European perennial having purple flower heads [syn: great knapweed, Centaurea scabiosa]
Usage examples of "greater knapweed".
The flowers are without the spreading outer rays of the Greater Knapweed, the florets being all tubular, which makes the black fringes to the bracts of the involucre most noticeable, hence the name of the species.