The American elm is a small to medium-sized (to very large) tree, at maturity with spreading branches forming a broad-spreading, fan-shaped crown. The branches just start closer to the ground. It is actually an older clone developed before the advent of DED in the United States. American Elm (Ulmus americana), once a stately and magnificent tree that lined America's city streets, has partly followed in the footsteps of the American Chestnut, with many large American Elms succumbing to Dutch Elm disease.This pathogen (transmitted by the elm bark beetle) plugs the vascular system of the tree, preventing the flow of water and nutrients and slowly killing it. USDA introduction. The apex of these leaves, on the other hand, is acuminate. American Elm Tree. The leaves of American elm are alternate in arrangement, oval, sharp pointed with double-toothed margins, and have prominent midrib and lateral veins. The ironwood leaf also has veins that branch out near the edge of the leaf. The American elm is known for its tough wood, which was used in the past to make wagon wheels. 'Valley Forge' - A U.S. National Arboretum introduction, this plant is probably the best choice for installation in … The base of elm leaves have an asymmetrical shape. The twigs are slender, reddish-brown turning as gray with age, hairy at first and smooth later. In order to identify an elm leaf, one should check whether it is 4 to 6 inches in length; the width has to be 1 to 3 inches. It forms the traditional vase shape, to 70' tall and 50' wide with yellow fall color. The base of the leaf is unequal and the surface of the leaf … American Elms used to line the sidewalks before Dutch Elm disease. Best used as street tree. This is a cultivar of the American elm. With its majestic, vase-shaped form accentuated by long, drooping branches, American elm is one of New England's most beautiful trees and was once a ubiquitous and monumental street tree in most towns. American Elm Leaves - Photo by Paul Wray, Iowa State University. Types Of Elm Trees 1. Imagine whole neighborhoods with American Elms on both sides creating an arch over the road. This double-trunk elm still shows the American Elm shape. It is the most similar in appearance and form to the American Elm, displaying the elegant vase shape crown. Look at the bark to verify that the shape is of an American Elm tree. Jefferson (Ulmus americana 'Jefferson'): Excellent resistance to Dutch elm disease; vase-shaped habit; considered sterile. Developed at the Morton Arboretum, this hybrid clone has shown good Dutch Elm disease resistance, elm leaf beetle and elm leaf miner resistance. Excellent resistance to Dutch elm disease and elm yellows, but can be susceptible to elm leaf beetle. Leaves of the elm have a single/double serrated margin. 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