Urban (elm cultivar)
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| Ulmus Urban |
|---|
| Hybrid parentage |
| U. pumila × (Commelin × (U. pumila × U. minor 'Hoersholmiensis')) |
| Cultivar |
| Urban |
| Origin |
| USA |
The Urban elm is an American cultivar derived from the same ancestry as Homestead and Regal, comprising the Siberian Elm U. pumila, the early Dutch hybrid Commelin, and a Danish field elm cultivar U. minor Hoersholmiensis. Selected from progeny of a controlled crossing made in 1958 by Toru Arisumi of the USDA at Columbus, Ohio, the tree is notable for its tolerance of poor soils, pollution, and drought, but is considered a poor ornamental, possessed of stiff branching and anomalous rounded form. It is resistant to Dutch elm disease, but vulnerable to elm leaf beetle.
Urban was one of a number of elm hybrids assessed by the Forestry Commission in the UK in the 1970s, and half a dozen trees were among a batch of elms donated by the Commission in 1981 to reinforce a shelter belt at the Royal Bath & West showground near Shepton Mallet. All the trees initially grew strongly on the heavy clay loam, attaining over 8 m in height in seven years. However, at this age, one died of Dutch Elm Disease whilst all the other trees exhibited weakness at the root, and several fell in gales in later years. The tree also featured in trials [1], in Canberra, Australia started in 1988 but "has not shown promise in that environment".
Contents |
[edit] Hybrid cultivars
Urban was crossed with the Wilson's Elm (now treated as Japanese Elm U. davidiana var. japonica) cultivar Prospector to create the cultivar Patriot.
[edit] Arboreta etc accessions
[edit] North America
- Morton Arboretum acc. no. 66-70
[edit] Europe
- Brighton & Hove City Council, NCCPG elm collection [2].
[edit] Nurseries
[edit] North America
[edit] Europe
None known.
[edit] Synonymy
- Delaware No. 1: USDA, before commercial release as Urban.
- Ohio Hybrid: Santamour, F. S., & Bentz, S. E. Updated checklist of elm (Ulmus) cultivars for use in North America. Journal of Arboriculture, 21(3): May, 1995.
[edit] References
- Bean, W. J. (1980). Trees and shrubs hardy in Great Britain, 8th edition. Murray, UK.
- Rouse, G. D. (1989). Elms on the Royal Bath & West Showground. Quarterly Journal of Forestry. 83. 170-172, 1989. Royal Forestry Society, Tring, Herts., UK
- Schreiber, L. R. & Main, H. V. (1976). HortScience, 11: 517-518, 1976.
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