Ulmus 'Morton Plainsman'
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| Ulmus hybrid |
|---|
| Hybrid parentage |
| U. pumila × U. davidiana var. japonica |
| Cultivar |
| 'Morton Plainsman'
Vanguard™ |
| Origin |
| USA |
The elm cultivar Morton Plainsman (Vanguard™) is another Morton Arboretum selection derived from a crossing of the Siberian Elm U. pumila and the Japanese Elm U. davidiana var. japonica grown from openly-pollinated seed donated by the Agriculture Canada Research Station at Morden in Manitoba. The tree has very vigorous upright growth, with leaves the same size and colour of the American Elm, and a high degree of drought and cold tolerance making it particularly suitable for afforestation in the Great Plains [1] [2]. In artificial freezing tests at the Morton Arboretum [3] the LT50 (temp. at which 50% of tissues die) was found to be - 40 °C.
However, its performance in the southern United States has not impressed, and it was dismissed, along with its Morton stablemates 'Morton Plainsman' (Commendation™) and 'Morton Glossy' (Triumph™), as "ugly" by Michael A. Dirr, Professor of Horticulture at the University of Georgia [1], on account of its "wild" growth and splaying branches. Moreover, it remains moderately susceptible to pests such as the elm-leaf beetle, Japanese beetle, and cankerworms, and in trials at the University of Minnesota it was found to have the second highest, after 'Morton Red Tip' (Danada Charm ™), incidence of branch breakage occasioned by bark inclusions [4].
The tree is currently being evaluated in the National Elm Trial [2] coordinated by Colorado State University. It has not been introduced to Europe or Australasia.
Contents |
[edit] Hybrid cultivars
'Morton Plainsman' (Vanguard) was crossed with the hybrid cultivar 'Morton' (Accolade). A selection of the resultant seedlings was marketed under the name 'Charisma', later changed to 'Morton Glossy' (Triumph).
[edit] Arboreta etc. accessions
- North America
- Bartlett Tree Experts acc. nos. 2001-106, 2001-108
- Chicago Botanic Garden, Glencoe, Illinois. 2 trees, no other details available.
- Dawes Arboretum [3], Newark, Ohio. 3 trees, no acc. details available.
- Holden Arboretum acc. no. 00-127
- Morton Arboretum acc. nos. 273-97, 4-2004
- Smith College acc. no. 36505
[edit] Nurseries
- North America
- Acorn Farms [4], Galena, Ohio.
- Bailey Nurseries [5], St. Paul, Minnesota.
- J. Frank Schmidt & Son [6], Boring, Oregon.
- Johnson's Nursery [7], Menomonee Falls, Wisconsin
[edit] References
- ^ Santamour, F. S., & Bentz, S. E. Updated checklist of elm (Ulmus) cultivars for use in North America. Journal of Arboriculture, 21(3): May, 1995.
- ^ Ware, G. (1992). Morton. Arb. Quarterly 28(1): 1-5, 1992.
- ^ Shirazi, A. M. & Ware, G. H. (2004). Evaluation of New Elms from China for Cold Hardiness in Northern Latitudes. International Symposium on Asian Plant Diversity & Systematics 2004, Sakura, Japan.
- ^ Giblin, C. P. & Gillman, J. H. (2006). Elms for the Twin Cities: A Guide for Selection and Maintenance. University of Minnesota.
[edit] External links
- 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.
