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Ulmus 'Plantyn'
''Ulmus'' 'Plantyn' (Anglicized form of 'Plantijn') was one of three Dutch hybrid elms released in 1973. Derived from a crossing of the Dutch hybrids '202' (''U. glabra'' 'Exoniensis' × ''U. wallichiana'') and '302' (''U. minor'' '1' × ''U. minor'' '28'), it was to prove of great significance in later developments.〔Heybroek, H. M. (1976). ''Ned. Bosbouw. Tijdschr.'' 48: 117-123, 1976.〕〔Heybroek, H. M. (1983). Resistant Elms for Europe. In Burdekin, D. A. (Ed.) Research on Dutch elm disease in Europe. ''For. Comm. Bull.'' 60. pp 108 - 113.〕 A selfed seedling was to become the first Dutch clone to prove effectively immune to disease, released in 1989 as 'Columella'. 'Plantyn' was also destined to be the female parent of released in 2002.〔Heybroek, H. M. (1993). The Dutch Elm Breeding Program. In Sticklen & Sherald (Eds.) (1993). ''Dutch Elm Disease Research'', Chapter 3. Springer Verlag, New York, USA.〕 In Italy, 'Plantyn' was used in hybridizations with the Siberian Elm ''Ulmus pumila'' by the Istituto per la Protezione delle Piante (IPP), to create three new cultivars released to commerce (see Hybrid cultivars).
==Description==
'Plantyn' is a fast-growing tree, with upright branching forming a broad crown where grown in isolation. The dark-green leaves are < 10 cm long by 7 cm broad, on < 10 mm petioles.
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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