Elms of sixteen distinct species are native to boreal and temperate regions of the Northern Hemisphere, with this single exception: western North America is without a rep resentative. Europe has three species, two of which ex tend their range into eastern Asia and northern Africa. Southern and central Asia have their own species. Five are native to our Eastern states. Two European species are in cultivation in the North Atlantic states, especially in the neighborhood of Boston, where they are as familiar as the native species, in street planting.
Elm trees are valuable for shade and for lumber; their wood is hard, heavy, tough, pale in color, often difficult to split. The trees are distinguished from others by
their simple, unsymmetrical, strong-ribbed leaves, saw toothed, short-stalked, always unequal and often oblique at the base of the blade. The flowers, usually perfect, are inconspicuous, and the seeds are flat, entirely surrounded by a thin papery wing, that forms two hooks at the tip. Wind-carried, these seeds have had much to do with the wide distribution of elms.