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Ulmus 'Homestead'
''Ulmus'' 'Homestead' is an American hybrid elm cultivar raised by Alden Townsend of the United States National Arboretum at the forestry station in Delaware, Ohio. The cultivar arose from a 1970 crossing of the Siberian Elm ''Ulmus pumila'' (female parent) with the hybrid N 215 ('Commelin' × (''U. pumila'' 'Turkestan' × ''U. minor'' 'Hoersholmiensis')), the latter grown from seed sent in 1960 to the University of Wisconsin-Madison elm breeding team by Hans Heybroek of the De Dorschkamp Research Institute in the Netherlands. 'Homestead' was released to commerce without patent restrictions in 1984.
==Description==
The tree rapidly produces very upright growth, increasing in height by as much as 2 m per annum,〔McPherson, G. ''et al''. (2008). National elm trial: Initial report from Northern California. ''Western Arborist'', Fall 2009, 32–36.〕 forming a pyramidal crown bearing dark green leaves < 7 cm long by 3.5 cm broad which turn straw yellow in autumn; the bark is dark grey.〔Photograph of 'Homestead' elm, ().〕 The perfect, apetalous wind-pollinated flowers appear in early March. The tree's ultimate height should be approximately 20 m, with a spread of 12 m.〔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, US. () 〕〔Townsend, A. M. & Masters, W. O., ''HortScience'', 19: 897-898, 1984.〕
Image:RN Ulmus Homestead foliage.JPG|Homestead foliage
Image:Homestead elm.JPG|Homestead elm in Radinden Manor Road, Hove, UK 2008
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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