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Tumble mustard, Sisymbrium altissimum, seeds.

Close-up of 22 small, tan seeds scattered on a gray background. A 1 millimeter scale indicates size and shows the seeds are less than 1 millimeter. Copyright information is at the bottom (Copyright 2007 The Regents of the University of California. All rights reserved.). Credit: James A. O'Brien, University of California
Credit: James A. O'Brien, University of California
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