Ulmus 'Willis'
| Ulmus hybrid cultivar | |
|---|---|
| Hybrid parentage | U. pumila × U. rubra |
| Cultivar | 'Willis' |
| Origin | USA |
Ulmus 'Willis' is a hybrid elm cultivar which originated as a crossing made by a Mr Minnick of Kansas and treated simply as a hybrid. 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]
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
- 1 2 Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus" (PDF). Arnoldia. Arnold Arboretum, Harvard University. 24 (6–8): 41–80. Retrieved 20 June 2016.
- 1 2 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.