Ulmus szechuanica: Difference between revisions
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| image_caption = ''Ulmus szechuanica'' leaves, |
| image_caption = ''Ulmus szechuanica'' leaves, summer |
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| regnum = [[Plant]]ae |
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'''''Ulmus szechuanica''''' Fang, or '''Szechuan Elm''' is a small to medium [[deciduous]] Chinese tree found along the [[Yangtze]] river through the provinces of [[Sichuan]], [[Jiangxi]], [[Anhui]], and [[Jiangsu]]. It can reach a height of 18 m, but is usually less than 10 m, with a spreading umbrella-like crown. The leaves, distinguished by their emergent red colour, are generally obovate < 9 cm long by 5 cm broad, borne on branchlets with an irregular corky layer. The wind-pollinated petal-less flowers are produced on second-year shoots in February, followed by suborbicular [[Samara (fruit)|samarae]] < 16 mm by 13 mm in March. |
'''''Ulmus szechuanica''''' Fang, or '''Szechuan Elm''' is a small to medium [[deciduous]] Chinese tree found along the [[Yangtze]] river through the provinces of [[Sichuan]], [[Jiangxi]], [[Anhui]], and [[Jiangsu]]. It can reach a height of 18 m, but is usually less than 10 m, with a spreading umbrella-like crown. The leaves, distinguished by their emergent red colour, are generally obovate < 9 cm long by 5 cm broad, borne on branchlets with an irregular corky layer. The wind-pollinated petal-less flowers are produced on second-year shoots in February, followed by suborbicular [[Samara (fruit)|samarae]] < 16 mm by 13 mm in March. |
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The tree was evaluated with other Chinese elms at the [[Morton Arboretum]], [[Illinois]], where it was found to grow best on well-drained soils, and exhibited a resistance to [[Dutch elm disease]]. However, it was also found to be comparatively weak-wooded, making it susceptible to storm damage in winter. |
The tree was evaluated with other Chinese elms at the [[Morton Arboretum]], [[Illinois]], where it was found to grow best on well-drained soils, and exhibited a resistance to [[Dutch elm disease]]. However, it was also found to be comparatively weak-wooded, making it susceptible to storm damage in winter. Elsewhere in the [[USA]], specimens are grown at the [[Denver Botanic Gardens]] and the [[Holden Arboretum]]. It was tested at a specialist nursery in [[Oklahoma]] where it was found to be completely unaffected by [[elm leaf beetle]]s [http://www.sunshinenursery.com/survey.htm], however it is now only commercially available from a nursery in [[Missouri]] [http://www.arborvillagellc.com/AV_Catalog_05-06.pdf.pdf]. |
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In the UK, it can be found at the [[Sir Harold Hillier Gardens]] and in the [[NCCPG]] elm collection [http://www.brighton-hove.gov.uk/index.cfm?request=c1108042] held by [[Brighton & Hove]] City Council. |
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''U. szechuanica'' is now considered rare and endangered in its native China. |
''U. szechuanica'' is now considered rare and endangered in its native China. |
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Revision as of 16:48, 24 January 2007
| Ulmus szechuanica | |
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| Ulmus szechuanica leaves, summer | |
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| Species: | U. szechuanica
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| Ulmus szechuanica Fang
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Ulmus szechuanica Fang, or Szechuan Elm is a small to medium deciduous Chinese tree found along the Yangtze river through the provinces of Sichuan, Jiangxi, Anhui, and Jiangsu. It can reach a height of 18 m, but is usually less than 10 m, with a spreading umbrella-like crown. The leaves, distinguished by their emergent red colour, are generally obovate < 9 cm long by 5 cm broad, borne on branchlets with an irregular corky layer. The wind-pollinated petal-less flowers are produced on second-year shoots in February, followed by suborbicular samarae < 16 mm by 13 mm in March.
The tree was evaluated with other Chinese elms at the Morton Arboretum, Illinois, where it was found to grow best on well-drained soils, and exhibited a resistance to Dutch elm disease. However, it was also found to be comparatively weak-wooded, making it susceptible to storm damage in winter. Elsewhere in the USA, specimens are grown at the Denver Botanic Gardens and the Holden Arboretum. It was tested at a specialist nursery in Oklahoma where it was found to be completely unaffected by elm leaf beetles [1], however it is now only commercially available from a nursery in Missouri [2].
In the UK, it can be found at the Sir Harold Hillier Gardens and in the NCCPG elm collection [3] held by Brighton & Hove City Council.
U. szechuanica is now considered rare and endangered in its native China.
Synonymy
- Ulmus erythrocarpa Cheng
References
- Fu, L. & Jin J. (eds). (1992). China Red Data Book. Rare and endangered plants. Vol. 1. Science Press, Beijing.
- 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. [4]
- Ware, G. (1995). Little-known elms from China: landscape tree possibilities. Journal of Arboriculture, (Nov. 1995). International Society of Arboriculture, Champaign, Illinois, USA. [5]