Ulmus × intermedia 'Rosehill'

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 parentageU. pumila × U. rubra
Cultivar'Rosehill'
OriginMissouri, 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

The tree was later marketed by the Willis Nursery Co. of Ottawa, Kansas.[2] 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,[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

References
  1. Harvard University Herbaria, specimen 00170038: Arnold Arboretum U. pumila × U. rubra 'Rose Hill' (1985), superseding label Ulmus 'Rosehill' (1984); summer leaves
  2. Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. Arnold Arboretum, Harvard University. 24 (6–8): 41–80. Retrieved 16 February 2017.
  3. "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
  4. Harvard University Herbaria, herbarium specimen 00170039: Arnold Arboretum U. pumila × U. rubra 'Rose Hill' (1985), superseding label Ulmus 'Rosehill' (1984); samarae & new leaves
  5. 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.
  6. 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.
  7. "U. rubra x U. pumila 'Rosehill' tree". Arnold Arboretum. Archived from the original on 5 October 2022.
  8. "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.
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