Morton (Accolade)
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| Ulmus Morton Accolade™ |
|---|
| Hybrid parentage |
| U. davidiana var. japonica × U. wilsoniana |
| Cultivar |
| Morton Accolade™ |
| Origin |
| USA |
Morton Accolade™ is an elm cultivar derived from a hybrid planted at the Morton Arboretum in 1924, which itself originated as seed collected from a tree at the Arnold Arboretum in Massachusetts. Although this tree was originally identified as U. crassifolia, it is now is believed to have been a hybrid of the Japanese Elm U. davidiana var. japonica and Wilson's Elm, the latter now sunk as another form of U. davidiana var. japonica (Fu, 2002).
The tree at the Morton Arboretum was noted for the resemblance of its habit to the American Elm U. americana, its upright-arching branches creating the familiar vase-shape. Moreover, in its 80+ years it had survived three epidemics of Dutch Elm Disease unscathed. Accordingly, it has now been cloned and promoted by the Chicagoland Grows corporation as a potential substitute for the innumerable American Elms lost to disease. However, the tree does not grow as large as the iconic native elm, reaching scarcely 20 m at maturity, and its glossy, deep green leaves are also markedly smaller.
Accolade™ is reputed to grow well in almost all soils save those excessively wet, and is notably drought-tolerant. The tree grows vigorously at first, gaining as much as one metre per annum, but slows to approximately half that rate with maturity. Thus, a typical 20 year-old tree could be expected to have reached 10 m in height with a crown about 5 m in width.
Accolade™ has also proved to be highly resistant to elm yellows and the elm leaf beetle. The tree is not (2006) commercially available in Europe, although specimens grown from selfed seeds are featured in the Butterfly Conservation elm trials in Hampshire, England, where they have grown with extraordinary vigour, and proved very tolerant of local conditions, notably waterlogged soils in winter.
Contents |
[edit] Hybrid cultivars
Accolade™ was crossed with the hybrid cultivar Morton Plainsman Vanguard™. A selection of the resultant seedlings was marketed under the name Charisma, later changed to Morton Glossy Triumph™.
[edit] Arboreta etc. accessions
[edit] North America
- Arnold Arboretum acc. no. 130-2002
- Brenton Arboretum No details available.
- Holden Arboretum acc. nos. 89-76, 91-114, 98-23, L-00-501
- Morton Arboretum acc. nos. 2352-24, 255-74, 128-92, 272-97, 35-98, 280-2003. 495-2004, 1095-2004, 1246-2004, 1347-2004
- Smith College acc. nos. 20304, 35804, 37505
[edit] Europe
- Royal Botanic Garden Edinburgh, UK, acc. no. 20021372
- Great Fontley Farm, Fareham, UK, Butterfly Conservation elm trials site
[edit] Nurseries
[edit] North America
- Acorn Farms [1], Galena, Ohio.
- Bailey Nurseries [2], St. Paul,Minnesota.
- Charles J. Fiore [3], Prairie View, Illinois.
- ForestFarm [4], Williams, Oregon.
[edit] Europe
None known.
[edit] Synonymy
- Thornhill Elm: Anon.
[edit] References
- Brookes, A. H. (2006). An evaluation of disease-resistant hybrid and exotic elms as larval host plants for the White-letter Hairstreak butterfly Satyrium w-album, Part 1. Butterfly Conservation, Lulworth, UK.
- 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. [7]
- Guries, R. P. & Smalley, E. B., (1986), Proc. Third Nat. Urban Forestry Conf., pp 214-218, 1986, Orlando, Florida.
- Ware, G. Morton Arb. Quarterly, 28(1): 1-5, 1992.
[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.
- http://www.mortonarb.org/plantinfo/plantclinic/phc/New-Elms-For-The-Landscape.pdf. Miller, F. (2002). New elms for the landscape and urban forest.
