The names swamp ash and water ash refer to situations in which the tree grows best. It is one of the thirstiest inhabitants of the forest. Its aggressive roots ramify through the soil and drink up the moisture so voraciously that if water is not abundant, neighboring trees and plants may find their roots robbed, and the functions of healthy growth will be interfered with. This has led to a general belief that black ash poisons trees that it touches. It simply robs their roots. Carolina and Lombardy poplars will sometimes do the same thing. The name black ash by which this tree is now known in most regions where it grows refers to the color of the large, prominent, shiny, blue-black buds in late winter and early spring; to the very dark green leaves in summer--which at a distance resemble the foliage of post oak--and, to some extent, to the dark brown color of the heartwood, though the wood is not always a safe means of identification if judged from superficial appearance only. The form of the tree assists in identifying it; for it is the slimmest of the ashes, in proportion to its height. Trunks three feet through are heard of, but few persons have ever seen one much over twenty inches, and many are about done growing when they are one foot in diameter. Yet the trunks of such are very tall, perhaps seventy or eighty feet. Their appearance has been likened to tall, slender columns of dark gray granite. They often stand so straight that a plummet line will not reveal a deviation from the perpendicular. The tree has been called elder-leaved ash. The form of the foliage has something to do with that name, but the odor more. Crush the leaves, and they smell like elder. The compound leaves are from twelve to sixteen inches long; the leaflets range from seven to eleven in number, and the side leaflets have no stalks. The leaves appear late in spring, and they fall early in autumn. They drop with the butternut leaves, and like them, all at once. The seed is winged, and the wing forms a margin entirely round the seed. The wood of black ash is rather soft, moderately heavy, tough, but only moderately strong, not durable in contact with the soil, dark brown in color with sapwood whiter. The species ranges farther north than any other ash, and grows in cold swamps and on the low banks of streams and lakes from Newfoundland to Winnipeg, and southward to Virginia, southern Illinois, southern Missouri, and Arkansas.