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The American elm is a deciduous tree which, under ideal conditions, can grow to heights of 21 to 35 meters (69 to 115 feet). [3] The trunk may have a diameter at breast height (dbh) of more than 1.2 m (4 ft), supporting a high, spreading umbrella-like canopy.
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.
Just to the west of the tree is a small elm from a cutting made in 1979. [49] "Herbie", once New England's oldest and tallest elm, was cut in 2010 after a long battle with Dutch elm disease. Former Massachusetts champion American elm in Old Deerfield, which was removed in 2017 due to Dutch elm disease.
Tree Family Ulmaceae Archived 4 January 2015 at the Wayback Machine Diagnostic photos of Elm species at the Morton Arboretum "Late 19th and early 20th-century photos of Elm species in Elwes & Henry's Trees of Great Britain & Ireland, v. 7" (PDF). 1913. Archived from the original (PDF) on 3 March 2016 "Elm Photo Gallery".
The American Elm cultivar Ulmus americana 'Delaware' was originally selected (as tree number 218, a c.1940 seedling from North Dakota) from 35,000 seedlings inoculated with the Dutch elm disease fungus in USDA trials at Morristown, New Jersey. [1]
The American Elm cultivar Ulmus americana 'St. Croix' is a recent (2008) selection cloned from a large tree growing on a farm near Afton, Minnesota, [1] which has displayed a high resistance to Dutch elm disease (DED). [2] A U S patent, PP 20097, was granted in 2009.
Ulmus mexicana - Mexican elm; Ulmus serotina - September elm; Ulmus thomasii - rock elm, cork elm; Subgenus Ulmus. U. section Foliaceae. Ulmus castaneifolia - chestnut-leafed elm, multi-nerved elm; Ulmus changii - Hangzhou elm Ulmus changii var. changii; Ulmus changii var. kunmingensis; Ulmus chenmoui - Chenmou elm, Langya Mountain elm; Ulmus ...
'Moline' was susceptible to Dutch elm disease. [11] In trials at the Morton Arboretum, Illinois, the tree was eschewed by the Elm Leaf Beetle Xanthogaleruca luteola. [12] No other specific information available, but the species as a whole is highly preferred for feeding by the Japanese Beetle Popillia japonica.