Ulmus × intermedia 'Willis'
Elm cultivar
From Wikipedia, the free encyclopedia
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
In 1995 Santamour reported the cultivar "not widely tested for resistance to Dutch elm disease".[2] Elowsky, Jordon-Thaden, and Kaul (2013) refer to more recent papers on the subject.[3]