Ulmus × intermedia 'Rosehill'
Elm cultivar
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The hybrid elm cultivar Ulmus × intermedia 'Rosehill' is an American hybrid cultivar originally raised by the Rose Hill Nurseries of Kansas City, Missouri, as Ulmus 'Rose Hill', without species names,[1] from a selection of Ulmus pumila (female parent) × Ulmus rubra seedlings made in 1951.[2]
| Ulmus × intermedia cultivar | |
|---|---|
| Hybrid parentage | U. pumila × U. rubra |
| Cultivar | 'Rosehill' |
| Origin | Missouri, US |
Description
'Rosehill' was described as slightly slower growing than its sibling 'Willis', but carrying a heavier crown, with good branching and attractive foliage.[3] Herbarium specimens show leaves 2 to 3 in. long and 1 to 2 in. wide, and the seed central in a rounded samara, with an open circular notch at the apex.[4]
Pests and diseases
In 1995 Santamour reported the cultivar "not widely tested for resistance to Dutch elm disease".[5] Elowsky, Jordon-Thaden, and Kaul (2013) refer to more recent papers on the subject.[6]
Cultivation
Notable trees
A well-grown tree labelled 'Rosehill', sourced from the Willis Nursery of Kansas and planted in 1960,[1][4] stands in Arnold Arboretum, Massachusetts.[7] The arboretum's herbarium specimen (00170039), labelled simply Ulmus 'Rosehill' in 1984, was changed in 1985 to U. pumila × U. rubra 'Rose Hill'.[4] A photograph shows leaves with only about eight vein pairs,[8] fewer than known examples of Ulmus × intermedia,[6] calling into question the identification of 'Rosehill' as a hybrid of this group.[3] The herbarium specimen, however, shows leaves with on average about 12 vein pairs,[1] more typical of this hybrid group.[6]
Synonymy
- 'Boulevard': Rosehill Gardens, Kansas, Missouri; Spring catalog 1960.[2]
Accessions
North America
- Arnold Arboretum, US.; acc. no. 748-60.