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Ulmus davidiana var. japonica 'Prospector'
The Japanese Elm cultivar ''Ulmus davidiana'' var. ''japonica'' 'Prospector' was originally treated as a cultivar of Wilson's Elm ''U. wilsoniana'' Schneid., a species sunk as ''Ulmus davidiana'' var.''japonica'' by Fu.〔Fu, L., Xin, Y. & Whittemore, A. (2002). Ulmaceae, in Wu, Z. & Raven, P. (eds) ''Flora of China'', Vol. 5 (Ulmaceae through Basellaceae). Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, USA. ()〕 A U.S. National Arboretum introduction (NA 55398), it was selected in 1975 from a batch of 1965 seedlings in Delaware, Ohio, and released without patent restrictions in 1990.〔''HortScience'', 26, 81-82, 1991.〕
==Description==
'Prospector' is a medium tree with a light-grey bark, attaining a height of approximately 14 m and developing a vase shape broadly similar to the American Elm but with lower-drooping branches () (). The deep-green, glossy obovate leaves are < 11 cm long by 8 cm wide, emerging orange-red and turning yellow in autumn. The perfect, apetalous wind-pollinated flowers emerge in early spring, before the leaves. The samara, <15 mm long, is obovate to orbicular.
The tree grows at a comparatively modest pace in the USA; specimens planted at UC Davis as part of the National Elm Trial increased in height by 0.85 m and d.b.h. by 2 cm in the first few years after establishment 〔McPherson, G. et al. (2008). National elm trial: Initial report from Northern California. ''Western Arborist'', Fall 2009, 32–36.〕 () The species does not sucker from roots. 〔Heybroek, H. M. (1981). The Japanese elm species and their value for the Dutch elm breeding program. ''Proceedings of the Dutch Elm Disease symposium and workshop''. October 5–9, 1981, Winnipeg, Manitoba. 78–90〕
Image: Ulmus 'Prospector' emergent leaf.jpg|'Prospector' emergent leaf colouring.
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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