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Ulmus 'Patriot'
''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. ()
==Description==
The tree develops an upsweeping crown, ultimately adopting a narrow vase-shape. The leaves are slightly obovate, with doubly serrate margins and typically acuminate apices; they are of an average size for the genus, < 10 cm long by 7.5 cm broad, glossy dark green turning yellow in autumn.〔Santamour, J., Frank, S. & Bentz, S. (1995). Updated checklist of elm (Ulmus) cultivars for use in North America. ''Journal of Arboriculture'', 21:3 (May 1995), 121-131. International Society of Arboriculture, Champaign, Illinois, USA. () 〕
The perfect, apetalous wind-pollinated flowers appear in March. Flowering usually begins when the tree is aged six years.
Growth is vigorous, specimens in the USDA trials reaching a height of over 13 m (43 ft) and a spread of nearly 8 m (25 ft) after only 13 years. In an assessment at U C Davis as part of the National Elm Trial, 'Patriot' increased in height by almost 1.5 m and d.b.h. by 2.5 cm per annum.〔McPherson, G. ''et al''. (2008). National elm trial: Initial report from Northern California. ''Western Arborist'', Fall 2009, pp 32-36.〕 ()
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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