Also found in: Thesaurus, Medical, Encyclopedia, Wikipedia.


Any of various weedy thistlelike plants in the composite family having flowers grouped in a head with a spiny involucre, especially several species of the genus Centaurea and the Eurasian species Acroptilon repens.

[Middle English knopwed : knop, knob; see knop + wed, weed; see weed1.]


(Plants) any of several plants of the genus Centaurea, having purplish thistle-like flowers: family Asteraceae (composites). See also centaury2, hardheads
[C15 knopwed; see knop, weed1]



any composite plant of the genus Centaurea, esp. the weedy C. nigra, having rose-purple flowers set on a dark-colored, knoblike bract.
[1400–50; late Middle English knopwed=knoppe a small rounded protuberance + weed1]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.knapweed - any of various plants of the genus Centaurea having purple thistlelike flowersknapweed - any of various plants of the genus Centaurea having purple thistlelike flowers
slender knapweed - a variety of knapweed
Jersey knapweed - a variety of knapweed
centaury - any plant of the genus Centaurea
black knapweed, Centaurea nigra, hardheads, lesser knapweed - a weedy perennial with tough wiry stems and purple flowers; native to Europe but widely naturalized
Centaurea scabiosa, great knapweed, greater knapweed - tall European perennial having purple flower heads
References in periodicals archive ?
Collections were also made from species such as black knapweed, betony, common rock rose, woodruff and pig nut.
What had looked like a productive natural opening far from the road had morphed into a monotone sweep of brown knapweed pressing against the edge of the woods.
Honeysuckle, multiflora rose, bittersweet, Japanese barberry, autumn olive, buckthorn, and spotted knapweed are found throughout the treatment area in moderate to heavy amounts.
And already, 11 bee orchids have flowered in the Brierdene area of Whitley Bay, along with plants such as birds foot trefoil, black knapweed and red clover - creating the perfect habitat for the borough's bees, as well as a range of butterflies.
Everyone is also invited to participate in a special work-day event to clear the land of knapweed, an invasive plant, on Saturday, Nov.
In fact, the European flies introduced to control knapweed made a tasty snack for local deer mice.
Bozievich said he's heard from many local farmers and livestock owners who feel the current policy is too restrictive and isn't doing enough to prevent the spread of certain invasive species, like meadow knapweed.
Coleoptera: Curculionidae) has also been shown to reduce spotted knapweed density (Corn 2006; Story et al.
There was also Sage the Owl and Constable Knapweed.
This list was narrowed down to two really promising plant species with anticancer properties, Akhilia zat al-alf waraqah" Achillea falcate, and "Shawk al-dardar," Centauria ainetensis, commonly known as yarrow and loggerheads or knapweed, respectively.
A review of remote sensing of invasive weeds and example of the early detection of spotted knapweed (Centaurea maculosa) and babysbreath (Gypsophila paniculata) with a hyperspectral sensor.