Definition of knapweed in English:

knapweed

noun ˈnapwiːdˈnæpwid

mass noun

A tough-stemmed Eurasian plant that typically has purple thistle-like flower heads, occurring chiefly in grassland and on roadsides.
矢车菊
Genus Centaurea, family Compositae: several species, including the widespread common (or lesser) knapweed (C. nigra) (also called hardheads)
Example sentencesExamples
- The oil from the seeds of cotton thistles was extracted for fuel and knapweed, centaurea scabiosa, was believed to promote healing of bruises and wounds.
- Currently, most producers apply chemicals on rangeland in spring or summer, when knapweed begins to flower, but research is showing that fall application may be preferable.
- Invasive weeds such as cheatgrass and knapweeds have settled on some 125 million acres of the American West.
- Spotted knapweed is not killed by fire, but sagebrush is.
- In Montana, gall flies released to limit knapweed turn out to provide a food bonanza for white-footed mice.

Origin

Late Middle English (originally as knopweed): from knop (because of its hard rounded involucre or ‘head’) + weed.

Definition of knapweed in US English:

knapweed

nounˈnæpwidˈnapwēd

A tough-stemmed Eurasian plant that typically has purple thistle-like flower heads, occurring chiefly in grassland and on roadsides.
矢车菊
Genus Centaurea, family Compositae: several species, including the widespread black knapweed (C. nigra) (also called hardheads)
Example sentencesExamples
- Invasive weeds such as cheatgrass and knapweeds have settled on some 125 million acres of the American West.
- The oil from the seeds of cotton thistles was extracted for fuel and knapweed, centaurea scabiosa, was believed to promote healing of bruises and wounds.
- Currently, most producers apply chemicals on rangeland in spring or summer, when knapweed begins to flower, but research is showing that fall application may be preferable.
- In Montana, gall flies released to limit knapweed turn out to provide a food bonanza for white-footed mice.
- Spotted knapweed is not killed by fire, but sagebrush is.

Origin

Late Middle English (originally as knopweed): from knop (because of its hard rounded involucre or ‘head’) + weed.

词汇	knapweed
释义	Definition of knapweed in English: knapweed noun ˈnapwiːdˈnæpwid mass noun A tough-stemmed Eurasian plant that typically has purple thistle-like flower heads, occurring chiefly in grassland and on roadsides. 矢车菊 Genus Centaurea, family Compositae: several species, including the widespread common (or lesser) knapweed (C. nigra) (also called hardheads) Example sentencesExamples The oil from the seeds of cotton thistles was extracted for fuel and knapweed, centaurea scabiosa, was believed to promote healing of bruises and wounds. Currently, most producers apply chemicals on rangeland in spring or summer, when knapweed begins to flower, but research is showing that fall application may be preferable. Invasive weeds such as cheatgrass and knapweeds have settled on some 125 million acres of the American West. Spotted knapweed is not killed by fire, but sagebrush is. In Montana, gall flies released to limit knapweed turn out to provide a food bonanza for white-footed mice. Origin Late Middle English (originally as knopweed): from knop (because of its hard rounded involucre or ‘head’) + weed. Definition of knapweed in US English: knapweed nounˈnæpwidˈnapwēd A tough-stemmed Eurasian plant that typically has purple thistle-like flower heads, occurring chiefly in grassland and on roadsides. 矢车菊 Genus Centaurea, family Compositae: several species, including the widespread black knapweed (C. nigra) (also called hardheads) Example sentencesExamples Invasive weeds such as cheatgrass and knapweeds have settled on some 125 million acres of the American West. The oil from the seeds of cotton thistles was extracted for fuel and knapweed, centaurea scabiosa, was believed to promote healing of bruises and wounds. Currently, most producers apply chemicals on rangeland in spring or summer, when knapweed begins to flower, but research is showing that fall application may be preferable. In Montana, gall flies released to limit knapweed turn out to provide a food bonanza for white-footed mice. Spotted knapweed is not killed by fire, but sagebrush is. Origin Late Middle English (originally as knopweed): from knop (because of its hard rounded involucre or ‘head’) + weed.
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