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. The apex of these leaves, on the other hand, is acuminate. American Elm Tree. 'Valley Forge' - A U.S. National Arboretum introduction, this plant is probably the best choice for installation in … 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. 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. The base of the leaf is unequal and the surface of the leaf … Excellent resistance to Dutch elm disease and elm yellows, but can be susceptible to elm leaf beetle. Best used as street tree. Types Of Elm Trees 1. It is actually an older clone developed before the advent of DED in the United States. Imagine whole neighborhoods with American Elms on both sides creating an arch over the road. 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. This is a cultivar of the American elm. American Elms used to line the sidewalks before Dutch Elm disease. USDA introduction. Developed at the Morton Arboretum, this hybrid clone has shown good Dutch Elm disease resistance, elm leaf beetle and elm leaf miner resistance. Jefferson (Ulmus americana 'Jefferson'): Excellent resistance to Dutch elm disease; vase-shaped habit; considered sterile. The leaves of American elm are alternate in arrangement, oval, sharp pointed with double-toothed margins, and have prominent midrib and lateral veins. Leaves of the elm have a single/double serrated margin. It forms the traditional vase shape, to 70' tall and 50' wide with yellow fall color. Ulmus americana: American Elm 2 Foliage Leaf arrangement: alternate Leaf type: simple Leaf margin: double serrate Leaf shape: oblong, ovate Leaf venation: pinnate Leaf type and persistence: deciduous Leaf blade length: 1 to 5 inches Leaf color: green and smooth to slightly scabrous on top, lighter green and pubescence underneath 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. The ironwood leaf also has veins that branch out near the edge of the leaf. 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