These trees are found mostly in the North, where they form large forests from which are taken the large quantities of timber of this kind used every year. The wood is very popular for use in rough building construction or for finished work which is to be painted, as it is very regular in structure and consequently easy to work; it can be obtained in large, long, straight pieces, and is light and strong. The demand for woods of this kind is considerably in excess of the demand for the harder woods. The trees are mostly but not all evergreen, and bear needles instead of leaves, together with the cones, from which they are called conifers.