英语词汇“knapweed”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

knapweed

/ˈnapwiːd

noun [mass noun]

A tough-stemmed Eurasian plant that typically has purple thistle-like flower heads, occurring chiefly in grassland and on roadsides.

Genus Centaurea, family Compositae: several species, including the widespread common (or lesser) knapweed (C. nigra) (also called hardheads).

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.
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.

单词	knapweed
释义	knapweed /ˈnapwiːd / noun [mass noun] A tough-stemmed Eurasian plant that typically has purple thistle-like flower heads, occurring chiefly in grassland and on roadsides. Genus Centaurea, family Compositae: several species, including the widespread common (or lesser) knapweed (C. nigra) (also called hardheads). 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. 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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