Changes

|species=davidiana

|species=davidiana

|cultivar=japonica

|cultivar=japonica

|habit=tree

|habit=tree

|habit_ref=Flora - A Gardener's Encyclopedia

|habit_ref=Flora - A Gardener's Encyclopedia

|usda_ref=Flora - A Gardener's Encyclopedia

|usda_ref=Flora - A Gardener's Encyclopedia

|max_zone=9

|max_zone=9

|image=Great Elm of Hokkaido Uni.jpg

|image=Japanese elm.jpg

|image_width=240

|image_width=240

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'''''Ulmus davidiana''''' var. '''''japonica''''' <small>Rehder</small>, the '''Japanese Elm''', is one of the larger and more graceful Asiatic elms, endemic to much of continental north-east [[Asia]] and [[Japan]], where it is most commonly found growing in swamp forest on young alluvial soils.

'''''Ulmus davidiana''''' var. '''''japonica''''' <small>Rehder</small>, the '''Japanese Elm''', is one of the larger and more graceful Asiatic elms, endemic to much of continental north-east [[Asia]] and [[Japan]], where it is most commonly found growing in swamp forest on young alluvial soils.

Size and shape are variable, ranging from short trees bearing densely-branched broad crowns to tall, single-stemmed trees with narrow crowns <ref name=Heybroek,a>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. pp 78–90</ref>. The young shoots often bear corky wings, similar to those of the European [[Field Elm]] ''U. minor'', to which it is closely related. The leaves are generally [[leaf shape|obovate]], < 11&nbsp;cm long, and with a coarse upper surface. The [[perfect flower|perfect]], [[apetalous]] wind-pollinated flowers emerge in early spring, before the leaves. The [[Samara (fruit)|samara]], <15&nbsp;mm long, is obovate to orbicular, occasionally hairy over its entire surface but more often glabrous <ref name=Heybroek>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. pp 78–90.</ref><ref name=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 [http://flora.huh.harvard.edu/china/PDF/PDF05/Ulmus.pdf]</ref>.

Size and shape are variable, ranging from short trees bearing densely-branched broad crowns to tall, single-stemmed trees with narrow crowns <ref name=Heybroek,a>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. pp 78–90</ref>. The young shoots often bear corky wings, similar to those of the European [[Field Elm]] ''U. minor'', to which it is closely related. The leaves are generally [[leaf shape|obovate]], < 11 cm long, and with a coarse upper surface. The [[perfect flower|perfect]], [[apetalous]] wind-pollinated flowers emerge in early spring, before the leaves. The [[Samara (fruit)|samara]], <15 mm long, is obovate to orbicular, occasionally hairy over its entire surface but more often glabrous <ref name=Heybroek>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. pp 78–90.</ref><ref name=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 [http://flora.huh.harvard.edu/china/PDF/PDF05/Ulmus.pdf]</ref>.

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