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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.
The field elm (Ulmus minor) cultivar 'Atinia' , [1] commonly known as the English elm, formerly common elm and horse may, [2] and more lately the Atinian elm, [3] was, before the spread of Dutch elm disease, the most common field elm in central southern England, though not native there, and one of the largest and fastest-growing deciduous trees in Europe.
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".
Ulmus parvifolia, commonly known as the Chinese elm [2] or lacebark elm, is a species native to eastern Asia, including China, India, Japan, Korea, Vietnam, [3] Siberia and Kazakhstan. [4] It has been described as "one of the most splendid elms, having the poise of a graceful Nothofagus ".
Ulmus pumila, the Siberian elm, is a tree native to Asia.It is also known as the Asiatic elm and dwarf elm, but sometimes miscalled the 'Chinese elm' (Ulmus parvifolia). U. pumila has been widely cultivated throughout Asia, North America, Argentina, and southern Europe, becoming naturalized in many places, notably across much of the United States.
Ulmus 'Patriot' is a hybrid cultivar raised by the United States National Arboretum in 1980. Derived from a crossing of the American hybrid 'Urban' (female parent) with the Wilson's Elm (now treated as Japanese Elm U. davidiana var. japonica) cultivar 'Prospector', 'Patriot' was released to commerce, free of patent restrictions, in 1993.
The tree is named for Christine Buisman, the first full-time elm researcher (1927-1936) in the Netherlands, who provided the final proof that Graphium ulmi Schwarz (now: Ophiostoma ulmi (Buisman) Melin & Nannf.) was the causal agent of Dutch elm disease. Buisman died in 1936, aged 36. [citation needed]
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 .