Ulmus × hollandica 'Pioneer'
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| Ulmus × hollandica |
|---|
| Hybrid parentage |
| U. glabra × U. minor |
| Cultivar |
| 'Pioneer' |
| Origin |
| USA |
The elm hybrid cultivar Ulmus × hollandica 'Pioneer' is an American development arising from the crossing of two European species, the Wych Elm U. glabra and the Smooth-leaved Elm U. minor subsp. minor. It is very fast growing and distinguished by a dense, globular crown casting a heavy shade. The foliage is a very deep green, and the leaf shape similar to the Wych Elm.[1] Considered "quite hardy in Saint Paul", the University of Minnesota opined that it was "definitely a good selection for the Twin Cities (St. Paul and Minnesota) urban forest" although very different in appearance to the American Elm.[2] However, its resistance to Dutch elm disease is somewhat less than other American hybrids, and it was for this reason the tree was omitted from the elm trials [1] in eastern Arizona conducted by the Northern Arizona University. The tree is currently being evaluated in the National Elm Trial [2] coordinated by Colorado State University.
'Pioneer' has had a very limited introduction to Europe,[3] featuring in street tree trials in several Dutch cities in the late 1990s.
Contents |
[edit] Arboreta etc. accessions
[edit] North America
- Bartlett Tree Experts acc. nos. 85-0195, 85-0199
- Denver Botanic Gardens, no details available
- Holden Arboretum acc. no. 90-58
- New York Botanical Garden acc. no. 955/97
- Smith College acc. no. 5603
[edit] Europe
None known.
[edit] Nurseries
[edit] North America
- Bailey Nurseries [3], St. Paul, Minnesota
- ForestFarm [4], Williams, Oregon
- J. Frank Schmidt & Son Co. [5], Boring, Oregon
- Johnson's Nursery [6], Menomonee Falls, Wisconsin
- Pea Ridge Forest [7], Hermann, Missouri
[edit] Europe
- Westerveld Boomkwekerij B.V.[8], Opheusden, Netherlands
[edit] References
- ^ Santamour, J., Frank, S. & Bentz, S. (1995). Updated checklist of elm (Ulmus) cultivars for use in North America. Journal of Arboriculture, 21:3 (May 1995), 121-131. International Society of Arboriculture, Champaign, Illinois, USA.
- ^ Giblin, C. P. & Gillman, J. H. (2006). Elms for the Twin Cities: A Guide for Selection and Maintenance. University of Minnesota.
- ^ Burdekin, D. A. & Rushforth, K. D. (Revised by Webber J. F. 1996). Elms resistant to Dutch elm disease. Arboricultural Research Note 2/96. Arboricultural Advisory and Information Service, Alice Holt, Farnham, UK.
[edit] External links
- http://www.extension.iastate.edu/Publications/SUL4.pdf Summary, inc. photographs, of elm cultivars resistant to Dutch elm disease available in the USA.
- http://fletcher.ces.state.nc.us/programs/nursery/metria/metria11/warren/elm.htm Warren, K., J. Frank Schmidt & Son Co. (2002). The Status of Elms in the Nursery Industry in 2000.
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