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Ulmus americana 'Valley Forge'
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 resistance to Dutch elm disease.
==Description==
The branching is typically upright and arching, creating a broad vase-shaped structure complemented by a dense canopy of leaves. However, Michael A. Dirr, Professor of Horticulture at the University of Georgia criticized the tree's form as 'floppy' (). The bark features greyish, flat-topped ridges, separated by roughly diamond-shaped fissures. The dark green leaves are large, < 17 cm (avg. 12 cm) long by < 10 cm (avg. 7.4 cm) broad, typical of the species, turning golden yellow in autumn. In an assessment at U C Davis as part of the National Elm Trial, the tree initially grew comparatively slowly, increasing in height by 0.85 m per annum, although stem development at 2.6 cm d.b.h. was near average.〔McPherson, G. et al. (2008). National elm trial: Initial report from Northern California. ''Western Arborist'', Fall 2009, 32–36.〕
Image: Valley Forge leaf and Euro coin.jpg|Leaf with 1 Euro coin
Image: Valley forge autumn colour 2.jpg|Fall color
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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