Ulmus × intermedia 'Willis'
The hybrid elm cultivar Ulmus × intermedia 'Willis' originated as a crossing made by a Mr Minnick of Kansas. Almost certainly derived from a crossing of the Siberian Elm Ulmus pumila (female parent) and the Red Elm Ulmus rubra, it was originally believed that the male parent was the American Elm Ulmus americana.[1]
| Ulmus × intermedia cultivar | |
|---|---|
| Hybrid parentage | U. pumila × U. rubra |
| Cultivar | 'Willis' |
| Origin | US |
Description
'Willis' was described as having a smooth grey bark, large leaves similar to U. americana, and capable of very rapid growth.[1]
Pests and diseases
'Willis' has not been widely tested for resistance to Dutch elm disease.[2]
Cultivation
First marketed by the Willis Nursery Co., Ottawa, Kansas, circa 1959,[2] it is not known whether the cultivar remains in cultivation in the United States, nor whether it was ever introduced to Europe or Australasia.
References
- Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. Arnold Arboretum, Harvard University. 24 (6–8): 41–80. Retrieved 16 February 2017.
- Santamour, Frank S.; Bentz, Susan E. (May 1995). "Updated Checklist of Elm (Ulmus) Cultivars for use in North America". Journal of Arboriculture. 21 (3): 122–131. Retrieved 20 June 2016.
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