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Ironwood (Name given to various trees)

a name given to various trees from the quality of their timber. for it either an integral number or a The ironwood or hop-hornbeam of Amer- vulgar fraction; we may, however, apica (Ostrya virginica), order Cupuliferæ, proximate to it as closely as may be deof an imperfect power of the degree indicated is irrational. Such quantities are often called surds. is a tree with a trunk not exceeding six sired. In general, every indicated root inches in diameter, with very hard wood, so heavy that it sinks in water, and foliage resembling that of birch. The species of the genus Sideroxylon, known as ironwood, are natives of the tropics and also of New Zealand, the Cape, etc.

The S. inerme, or smooth ironwood of the cape, has long been cultivated in the greenhouses of Europe. Diospyros Ebenum (the ebony) is also named iron wood, as is the Metrosideros vera of Java.