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The Collaborative International Dictionary
Knapweed

Knapweed \Knap"weed`\, n. (Bot.) The black centaury ( Centaurea nigra); -- so called from the knoblike heads of flowers. Called also bullweed.

Wiktionary
knapweed

n. 1 Any of various common weeds of the genus ''Centaurea'' 2 # especially (taxlink Centaurea nigra species noshow=1).

WordNet
knapweed

n. any of various plants of the genus Centaurea having purple thistlelike flowers

Usage examples of "knapweed".

Others are scattered on the mounds and in the meads adjoining, where may be collected some heath still in bloom, prunella, hypericum, white yarrow, some heads of red clover, some beautiful buttercups, three bits of blue veronica, wild chamomile, tall yellowwood, pink centaury, succory, dock cress, daisies, fleabane, knapweed, and delicate blue harebells.

Others are scattered on the mounds and in the meads adjoining, where may be collected some heath still in bloom, prunella, hypericum, white yarrow, some heads of red clover, some beautiful buttercups, three bits of blue veronica, wild chamomile, tall yellowwood, pink centaury, succory, dock cress, daisies, fleabane, knapweed, and delicate blue harebells.

Centaurea nigra, the Black Knapweed, is a perennial, with an unwinged, erect stem, 6 inches to 3 feet high, generally freely branched in the upper part.

Poplars line the banks of creeks and shallow rivers, giving way to hawthorn and dogwood and at last to the broad expanse of feather grass and 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.

Nobody tended the grave --if grave it was, for nobody was even sure of that--but everybody knew that the little mound always produced the wild flower that was in season--wild violets, primroses, cowslips, marguerite daisies, scabious, knapweed.

Jake could see the asphalt whipping by, brown stalks of knapweed bent in the car's side draft.