The white elm (Ulmus Americana) is one of the grandest trees of the temperate zones for street and avenue planting, and it should have a place in parks and on large lawns. Like all oar widely distributed native trees the species varies in hardiness and even in habit as grown in widely separated localities. Varieties from the South or East will not thrive on the prairie, but our native variety makes as fine trees as can be found in New England. Some specimens that have had plenty of room, planted in open prairie exposure forty years ago, have now a spread of top of ninety feet or more.
Ulmus effîisa, from east Europe, is also a grand tree for ornamental planting or shade over the prairie States, but as yet it has not been propagated to any great extent.
The cork-barked white elm (Ulmus racemosa) has been thus far a neglected tree. It has not been propagated or recommended for ornamental planting. But as found native in north Iowa, it is one of the most desirable of the elms, where rather compact, round-topped trees are desirable.
The red elm (Ulmus fulva) is used to some extent in ornamental planting at the East and Southeast. At the West the native trees make a fine appearance in groups, but isolated trees in open exposure are liable to fungus growths on the branches and leaves.
The European elm (Ulmus campestris) is more upright and compact than our white elm and is used to some extent in Eastern planting, but it is not hardy in the prairie States.