Ulmus 'Clusius'
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| Ulmus hybrid |
|---|
 'Clusius' aged 8 years, Horsea Island, UK |
| Hybrid parentage |
| ('Exoniensis' × U. wallichiana) × 'Bea Schwarz' selfed |
| Cultivar |
| 'Clusius' |
| Origin |
| Wageningen, The Netherlands |
A Dutch hybrid elm cultivar raised at Wageningen, 'Clusius' was released for sale in 1983. Derived from a crossing of the same Dutch clones that produced the fastigiate 'Lobel' released in 1973: 202 (U. glabra 'Exoniensis' × U. wallichiana) and 336 (U. 'Bea Schwarz' selfed), but with larger leaves and broader crown. [1][2]. The tree flushes markedly later than most other elms, and is rarely in full leaf before mid-May.
The resistance of 'Clusius' to Dutch elm disease has proven to be only marginally greater and sales in the Netherlands declined from over 8,000 in 1979 to 600 in 2004[3] [1]. Ergo: while it remains for sale in Europe, its planting where the disease remains prevalent cannot be recommended.[4] 'Clusius' featured in New Zealand government trials during the 1990s at the Hortresearch station, Palmerston North, but is not known to have been introduced to North America.
Contents |
[edit] Arboreta etc. accessions
- Europe
- Arboretum de La Petite Loiterie [2], Monthodon, France. No details available
- Butterfly Conservation trials sites, Pigeonhouse Farm, Southwick, and Horsea Island, Portsmouth, UK, planted 2001.
[edit] Nurseries
- Europe
- Barchams [3], Ely, Cambs., UK.
- Bellwood Trees [4], Meigle, Perthshire, Scotland, UK.
- PlantenTuin Esveld [5], Boskoop, Netherlands.
- Standard Trees [6], Golden Cross, East Sussex, UK.
- Tuinenlandschap [7], Doetinchem, The Netherlands
- Westerveld Boomkwekerij B.V. [8], Opheusden, Netherlands.
[edit] Etymology
The cultivar is named for Carolus Clusius, a Dutch naturalist of the Renaissance.
[edit] References
- ^ Heybroek, H. M. (1983). Resistant Elms for Europe. In Burdekin, D. A. (Ed.) Research on Dutch elm disease in Europe. For. Comm. Bull. 60. pp 108 - 113.
- ^ Heybroek, H. M. (1993). The Dutch Elm Breeding Program. In Sticklen & Sherald (Eds.) (1993). Dutch Elm Disease Research, Chapter 3. Springer Verlag, New York, USA
- ^ Hiemstra, J.A. et al. (2007). Belang en toekomst van de iep in Nederland. Praktijkonderzoek Plant & Omgeving, Wageningen UR, Netherlands.
- ^ 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.
