ft:heartwood

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heartwood
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heartwood: The senescent inner or central portion of the wood (xylem) of an older stem or root, its cells no longer living, in which conduction has ceased and primary reserve materials are no longer stored, often containing terminal metabolic products, usually darker in color than the living, conducting sapwood that encircles it.[1]
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Example(s): Example sentence from FNA : [1] heartwood dark brown.

References

  1. Categorical Glossary for the Flora of North America Project, by Robert W. Kiger and Duncan M. Porter. 2001. Hunt Institute for Botanical Documentation.