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Ulmus americana, generally known as the American elm or, less commonly, as the white elm or water elm, [a] is a species of elm native to eastern North America. The trees can live for several hundred years. It is a very hardy species that can withstand low winter temperatures, but it is affected by Dutch elm disease.
American elm is a vase-shaped, medium to large, deciduous tree. [4] The tree can grow to greater than 30 m in height, and is distinguished by its dense, symmetrical, upright form and dark green foliage, ultimately forming a broad umbrella crown. Crotch angles can be acute, with considerable bark inclusion which can later lead to branch breakages.
Rows of American elm trees line a path south of the Lincoln Memorial Reflecting Pool on the National Mall in Washington, DC (November 11, 2006) Several rows of American elm trees that the National Park Service (NPS) first planted during the 1930s line much of the 1.9-mile-length (3 km) of the National Mall in Washington, DC. DED first appeared ...
The Liberty Tree (1646–1775) was a famous elm tree that stood in Boston, Massachusetts near Boston Common in the years before the American Revolution. In 1765, Patriots in Boston staged the first act of defiance against the British government at the tree. The tree became a rallying point for the growing resistance to the rule of Britain over ...
The Johnstown Elm, in Johnstown, New York, as of September 2013 did not show any signs of Dutch elm disease. In October 2018 all that remained was a weathered stump, cut perhaps two years earlier. It had a circumference of 196 inches (16.3 ft; 5.0 m), a height of 85 feet (26 m), and a crown of 88 feet (27 m).
Ulmus racemosa Thomas. Ulmus thomasii, the rock elm[3] or cork elm (or orme liège in Québec), is a deciduous tree native primarily to the Midwestern United States. The tree ranges from southern Ontario and Quebec, south to Tennessee, west to northeastern Kansas, and north to Minnesota. [4]
The American Elm cultivar Ulmus americana ' Valley Forge' was raised by the Agricultural Research Service in Maryland. The tree was released to wholesale nurseries without patent restrictions by the U. S. National Arboretum in 1995 after proving to have a high resistance to Dutch elm disease. 'Valley Forge' proved only moderately successful in ...
Ulmus crassifoliaNutt., the Texas cedar elm or simply cedar elm, is a deciduous tree native to south-central North America, mainly in southern and eastern Texas, southern Oklahoma, Arkansas, and Louisiana, with small populations in western Mississippi, southwest Tennessee, and north-central Florida; [ 2 ] it also occurs in northeastern Mexico ...