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Smooth crabgrass, Digitaria ischaemum, collar and sheath.

Close-up of vibrant green grass blades with a highlighted joint, set against a black background. 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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