Washington (elm cultivar)
From Wikipedia, the free encyclopedia
| Ulmus americana |
|---|
| Cultivar |
| Washington |
| Origin |
| USA |
The American Elm U. americana cultivar Washington is a tree of unknown derivation. Introduced by the U. S. National Parks Service, it 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 [1], this earlier supposition is likely to be erroneous; i.e. like the Jefferson elm, the Washington elm is probably a tetraploid clone after all. The tree is resistant to Dutch elm disease, but less so than other American elm cultivars such as Valley Forge. Neither Washington nor the cultivar Jefferson has been widely tested beyond Washington D.C..
[edit] Arboreta etc. accessions
[edit] North America
- Smith College, acc. no. 41703.
[edit] 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.
