Excellent resistance to Dutch elm disease and elm yellows, but can be susceptible to elm leaf beetle. 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. 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. This is a cultivar of the American elm. Developed at the Morton Arboretum, this hybrid clone has shown good Dutch Elm disease resistance, elm leaf beetle and elm leaf miner resistance. This double-trunk elm still shows the American Elm shape. The twigs are slender, reddish-brown turning as gray with age, hairy at first and smooth later. The ironwood leaf also has veins that branch out near the edge of the leaf. American Elm Leaves - Photo by Paul Wray, Iowa State University. It is the most similar in appearance and form to the American Elm, displaying the elegant vase shape crown. It is actually an older clone developed before the advent of DED in the United States. Best used as street tree. The base of the leaf is unequal and the surface of the leaf … 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 USDA introduction. Imagine whole neighborhoods with American Elms on both sides creating an arch over the road. Types Of Elm Trees 1. The apex of these leaves, on the other hand, is acuminate. The branches just start closer to the ground. american elm leaf; ironwood leaf; If you see a papery bladder that looks a little like a soft pine cone hanging by the leaves, then you know the tree is an ironwood. 'Valley Forge' - A U.S. National Arboretum introduction, this plant is probably the best choice for installation in … American Elms used to line the sidewalks before Dutch Elm disease. Jefferson (Ulmus americana 'Jefferson'): Excellent resistance to Dutch elm disease; vase-shaped habit; considered sterile. American Elm Tree. 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 American elm is known for its tough wood, which was used in the past to make wagon wheels. The base of elm leaves have an asymmetrical shape. The leaves of American elm are alternate in arrangement, oval, sharp pointed with double-toothed margins, and have prominent midrib and lateral veins. 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