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sapwood
The wood just under the bark of a stem or branch; it differs from the heartwood in color and in physiologic activity (flow of sap).
📑 Synonyms:
alburnum
💬 Quotations
The inner structure of these dicotyledonous trunks is seen when we examine the cross section cut of a felled tree. In the centre is the heartwood, the durable wood of commercial value, the cells of which are hard and dry; next it the soft sapwood, the living part of the tree containing cells filled with sap; then the cambium layer, the zone of growing cells, and outside of this the bark.
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