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glossary of plant terms
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pith - the center part of a twig, usually a different color or texture from the surrounding tissue

continuous pith is uniformly colored with no divisions, as in this Carya ovata (shagbark hickory) twig  hires

chambered pith has hollow spaces between woody partitions that divide the pith, as in this Juglans nigra (black walnut) twig  hires

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