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Ulmus pumila 'Green King' : ウィキペディア英語版 | Ulmus pumila 'Green King'
The Siberian Elm cultivar ''Ulmus pumila'' 'Green King' was once believed to have been derived from a crossing of the Siberian Elm ''Ulmus pumila'' with the American Red Elm ''Ulmus rubra''. However, it is now apparent the tree originated as a sport of ''U. pumila'' in 1939 at the Neosho Nurseries, Neosho, Missouri.〔Green, P. S. (1964). Registration of cultivar names in Ulmus. ''Arnoldia'', Vol. 24. Arnold Arboretum, Harvard University. ()〕 == Description == The tree typically forms a wide base and conical crown (), not dissimilar to the European Hornbeam ''Carpinus betulus'' 'Fastigiata' (known as 'Pyramidalis').
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