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Mature plant of Russian knapweed, Rhaponticum (=Acroptilon) repens.

Mature plant of Russian knapweed, <i>Rhaponticum</i> (=<i>Acroptilon</i>) <i>repens</i>. Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources — Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources

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