Trunk (botany)

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The base of a Yellow Birch trunk

In botany, the trunk (or bole) is the stem and main wooden axis of a tree,[1] which is an important feature in tree identification, and which often differs markedly from the bottom of the trunk to the top, depending on the species. The trunk is the most important part of the tree for timber production.

Trunks occur both in "true" woody plants as well as non-woody plants such as palms and other monocots, though the internal physiology is different in each case. In all plants, trunks thicken over time due to formation of secondary growth (or in monocots, pseudo-secondary growth). Trunks can be vulnerable to damage, including sunburn. Trunks which are cut down in logging are generally called logs and if cut to a specific length bolts.


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  1. ^ "trunk". The Free Online Dictionary. Retrieved 2017-02-17. 

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