Russian knapweed
noun
1A yellow-flowered knapweed, Centaurea ruthenica ( rare ).
2A perennial Eurasian knapweed, Acroptilon repens (formerly included in the genus Centaurea), with pink-purple flowers and creeping roots, considered to be invasive weed in North America and certain other areas.
Origin
Early 20th century.
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- hyperthermia
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