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Perennial ryegrass, Lolium perenne, collar and sheath.

A close view of the collar and sheath of perennial ryegrass. Ligules are membranous. 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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