Abstract
Botanically trees are grouped into two classifications
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(1)
Broad leaved trees (hardwoods) are generally hard, tough, dense and dark-coloured with acid, aromatic or even poisonous secretions, although not all hardwoods are hard. The medullary rays in hardwoods are usually more clearly visible than in softwoods. Typical examples of hard-woods are oak, teak, mahogany, walnut, elm, iroko and sapele.
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Needle leaved trees (softwoods) are coniferous with cone-shaped seed vessels and narrow, needle-shaped leaves. They are usually elastic and easy to work, and have resinous or sweet secretions. Some softwoods such as pitch pine are quite hard. Typical examples of softwoods are European redwood, yellow pine, Douglas fir, spruce, Western hemlock and Western red cedar.
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© 1987 Ivor H. Seeley
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Seeley, I.H. (1987). Building Maintenance Problems and Their Solution—III. In: Building Maintenance. Building and Surveying Series. Palgrave, London. https://doi.org/10.1007/978-1-349-18925-0_4
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