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Diffuse Knapweed

Centaurea diffusa (species), “White Knapweed”

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On Wikipedia
Centaurea diffusa, also known as diffuse knapweed, white knapweed or tumble knapweed, is a member of the genus Centaurea in the family Asteraceae. This species is common throughout western North America but is not actually native to the North American continent, but to the eastern Mediterranean.
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