Trunk (botany)
Main wooden axis of a tree / From Wikipedia, the free encyclopedia
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"Tree trunk" redirects here. For other uses, see Tree trunk (disambiguation).
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.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/e/e5/Yellow_birch_trunk.jpg/150px-Yellow_birch_trunk.jpg)
The trunk is the most important part of the tree for timber production.