| Ulmus × intermedia cultivar | |
|---|---|
| Hybrid parentage | U. pumila × U. rubra |
| Cultivar | 'Rosehill' |
| Origin | Missouri, US |
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, from a selection of Ulmus pumila (female parent) × Ulmus rubra seedlings made in 1951.
Description
'Rosehill' was described as slightly slower growing than its sibling 'Willis', but carrying a heavier crown, with good branching and attractive foliage. 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.
Pests and diseases
In 1995 Santamour reported the cultivar "not widely tested for resistance to Dutch elm disease". Elowsky, Jordon-Thaden, and Kaul (2013) refer to more recent papers on the subject.
Cultivation
The tree was later marketed by the Willis Nursery Co. of Ottawa, Kansas. It is not known whether 'Rosehill' remains in cultivation, or if it was ever introduced to Europe or Australasia.
Notable trees
A well-grown tree labelled 'Rosehill', sourced from the Willis Nursery of Kansas and planted in 1960, stands in Arnold Arboretum, Massachusetts. The arboretum's herbarium specimen (00170039), labelled simply Ulmus 'Rosehill' in 1984, was changed in 1985 to U. pumila × U. rubra 'Rose Hill'. A photograph shows leaves with only about eight vein pairs, fewer than known examples of Ulmus × intermedia, calling into question the identification of 'Rosehill' as a hybrid of this group. The herbarium specimen, however, shows leaves with on average about 12 vein pairs, more typical of this hybrid group.
Synonymy
- 'Boulevard': Rosehill Gardens, Kansas, Missouri; Spring catalog 1960.
Accessions
North America
- Arnold Arboretum, US.; acc. no. 748-60.
References
- ^ Harvard University Herbaria, specimen 00170038: Arnold Arboretum U. pumila × U. rubra 'Rose Hill' (1985), superseding label Ulmus 'Rosehill' (1984); summer leaves
- ^ Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. 24 (6–8). Arnold Arboretum, Harvard University: 41–80. Retrieved 16 February 2017.
- ^ "Ulme rote x Ulme pumila | Handbuch der Ulmengewächse" [Ulmus rubra x U. pumila]. Handbook of the Elm Family (in German). Archived from the original on 3 March 2016. Retrieved 26 October 2022.www.ulmen-handbuch.de
- ^ Harvard University Herbaria, herbarium specimen 00170039: Arnold Arboretum U. pumila × U. rubra 'Rose Hill' (1985), superseding label Ulmus 'Rosehill' (1984); samarae & new leaves
- 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.
- ^ Elowsky, C.G.; Jordon-Thaden, I.E.; Kaul, R.B. (10 July 2013). "A morphological analysis of a hybrid swarm of native Ulmus rubra Muhl. and introduced U. pumila L. (Ulmaceae) in southeastern Nebraska" (PDF). Phytoneuron. 2013–44: 1–23. ISSN 2153-733X. Archived from the original (PDF) on 5 October 2022. Retrieved 25 October 2017.
- "U. rubra x U. pumila 'Rosehill' tree". Arnold Arboretum. Archived from the original on 5 October 2022.
- "Leaves of tree labelled U. rubra x U. pumila 'Rosehill'". Handbook of the Elm Family. Archived from the original on 5 October 2022. Retrieved 26 October 2022.
