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sapwood

(Science: botany) The alburnum, or part of the wood on any exogenous tree next to the bark, being that portion of the tree through which the sap flows most freely; distinguished from heartwood. Newly formed outer wood lying between the cambium and the heartwood of a tree or woody plant; usually light colored; active in water conduction.The ring of living [[xylem [[tissue of a tree that lies within the layer of hardwood.