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Family = Asteraceae, Genus = Acroptilon, Species = repens, including synonyms,

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Acroptilon repens   (hardheads, Russian knapweed, Turkestan thistle)  
(= Centaurea repens in Flora of the Pacific Northwest)
Coarse, bushy perennial from deep rhizomes, 4-8 dm. tall, finely loose white-woolly throughout.
Distribution: Introduced chiefly east of the Cascades in Washington; widely distributed throughout much of North America.
Habitat: Dry, open areas at low elevation and foothills.
Origin: Introduced

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Washington Native Plant Society
WA Native Plant Society