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Yellow starthistle, Centaurea solstitialis, infestation.

Many yellow starthistle flowering plants infesting a hillside, so much so that the hill is yellow from afar. Copyright information is at the bottom (Copyright 2007 The Regents of the University of California. All rights reserved.). Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources — Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources

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