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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.
This species is a large deciduous tree, which forms a pyramidal habit. [4] It may reach 30 to 35 m (98 to 115 ft) in height in its natural habitat, but is usually shorter in cultivation. [5] The trunk is smoothly cylindrical and green or grey-green in colour, often tapering unbranched to the very tip of the tree.
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Branch attachment in common ash Fraxinus excelsior L. Figure 1: Anatomical drawing of the wood grain of a branch attachment in a tree. Initially branches are mechanically attached to the trunks of trees by forming interlocking wood grain patterns at the top of the joint, within what is known as 'axillary wood' (Fig. 1). [1]
A transverse section through a tree trunk or a horizontal core will show concentric circles of lighter or darker wood – tree rings. [68] These rings are the annual growth rings [69] [70] There may also be rays running at right angles to growth rings. These are vascular rays which are thin sheets of living tissue permeating the wood. [68]
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Ceiba pentandra is a tropical tree of the order Malvales and the family Malvaceae (previously emplaced in the family Bombacaceae), native to Mexico, Central America and the Caribbean, northern South America, and (as the variety C. pentandra var guineensis) West Africa.
Xanthorrhoea australis, the grass tree or austral grasstree, [1] is an Australian plant. It is the most commonly seen species of the genus Xanthorrhoea. Its trunk can grow up to several metres tall and is often branched. In certain Aboriginal languages, it is called bukkup, baggup or kawee. [1]