Ulmus americana 'Washington'
- Ulmus americana 'Washington'
Infobox Cultivar | name = "Ulmus americana"
cultivar = 'Washington'
origin = USA
The American Elm "Ulmus americana" cultivar 'Washington' is a tree of unknown derivation introduced by the U. S. National Park Service.
Description
The tree has been described as possibly having triploid chromosome levels (unusual for an American Elm), suggesting it may be a hybrid between the tetraploid American Elm and a diploid species. However, in view of a study performed by the United States National Arboretum in 2004 [http://www.elmpost.org/jeh905.pdf] , this earlier supposition is likely to be erroneous; therefore, like the cultivar 'Jefferson' which was also once considered triploid, 'Washington' is probably tetraploid.
Pests and diseases
The tree is resistant to Dutch elm disease, but less so than other recent American Elm cultivars such as 'Valley Forge'. Like all other American Elm cultivars, it is also susceptible to Elm Yellows.
Cultivation
Neither 'Washington' nor 'Jefferson' has been widely tested beyond Washington D.C.. The tree is not known to have been introduced to Europe or Australasia.
Accessions
North America
*Brooklyn Botanic Garden [http://www.bbg.org/cgi/bgbase/search.cgi] , New York, acc. no. 850233.
*Smith College, acc. no. 41703.
External links
*http://fletcher.ces.state.nc.us/programs/nursery/metria/metria11/warren/elm.htm Return of the Elm -the status of elms in the nursery industry in 2000. Warren, K., J. Frank Schmidt and Co.
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