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Ulmus 'Frontier'
''Ulmus'' 'Frontier' is an American hybrid cultivar (), a United States National Arboretum introduction (NA 55393) derived from a crossing of the European Field Elm ''Ulmus minor'' (female parent) with the Chinese Elm ''Ulmus parvifolia'' in 1971. Released in 1990, the tree is a rare example of the hybridization of spring-flowering and autumn-flowering elms.
==Description==
'Frontier' develops a vase or pyramidal shape, with glossy green foliage turning, unusually for elms, to burgundy in autumn.〔Photographs of burgundy colouring of 'Frontier' elm leaves in autumn: Arthur Lee Jacobson, 'Plant of the Month, 2008', photos 3 to 6 ()〕 The twigs are pubescent.〔Jacobson, Arthur Lee, 'Plant of the Month, 2008': arthurleej.com/p-o-m-Oct08.html.〕 Slow growing,〔McPherson, G. ''et al''. (2008). National elm trial: Initial report from Northern California. ''Western Arborist'', Fall 2009, 32–36.〕 the ultimate height of the tree has yet to be determined, but should be > 15 m. The tree is autumn-flowering 〔Jacobson, Arthur Lee, 'Plant of the Month, 2008' arthurleej.com/p-o-m-Oct08.html〕 but rarely flowers, and has not produced seed.〔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. ()〕〔Townsend, A. M., Schreiber, L. R., Masters, W. O. and Bentz, S. E. ''HortScience'', 26: 80–81, 1991.〕
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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