Ulmus × intermedia 'Rosehill' explained

Ulmus × intermedia cultivar
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.[1] 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".[2] 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.[3] 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,[4] [5] stands in Arnold Arboretum, Massachusetts.[6] The arboretum's herbarium specimen (00170039), labelled simply Ulmus 'Rosehill' in 1984, was changed in 1985 to U. pumila × U. rubra 'Rose Hill'.[5] A photograph shows leaves with only about eight vein pairs,[7] fewer than known examples of Ulmus × intermedia,[8] 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,[4] more typical of this hybrid group.[8]

Synonymy

Accessions

North America

Notes and References

  1. Web site: de. Ulme rote x Ulme pumila Handbuch der Ulmengewächse. Ulmus rubra x U. pumila . Handbook of the Elm Family . https://web.archive.org/web/20160303193329/http://www.ulmen-handbuch.de/handbuch/ulmus/u_rosehill.html. 3 March 2016 . dmy-all . 2022-10-26. www.ulmen-handbuch.de
  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 . 20 June 2016.
  3. Green . Peter Shaw . Peter Shaw Green . 1964 . Registration of cultivar names in Ulmus. dmy-all . Arnoldia . 24. 41–80 . 6–8 . . 16 February 2017.
  4. Harvard University Herbaria, specimen 00170038: Arnold Arboretum U. pumila × U. rubra 'Rose Hill' (1985), superseding label Ulmus 'Rosehill' (1984); summer leaves
  5. Harvard University Herbaria, herbarium specimen 00170039: Arnold Arboretum U. pumila × U. rubra 'Rose Hill' (1985), superseding label Ulmus 'Rosehill' (1984); samarae & new leaves
  6. Web site: U. rubra x U. pumila 'Rosehill' tree . . dmy-all . https://web.archive.org/web/20221005161312/https://www.ulmen-handbuch.de/handbuch/ulmus/fotos/ulmus_rosehill_1_gr.jpg . 2022-10-05 . live.
  7. Web site: Leaves of tree labelled U. rubra x U. pumila 'Rosehill' . dmy-all . https://web.archive.org/web/20221005161314/https://www.ulmen-handbuch.de/handbuch/ulmus/fotos/ulmus_rosehill_2_gr.jpg . 2022-10-05 . Handbook of the Elm Family . live . 2022-10-26.
  8. Elowsky. C.G.. Jordon-Thaden. I.E.. Kaul. R.B.. A morphological analysis of a hybrid swarm of native Ulmus rubra Muhl. and introduced U. pumila L. (Ulmaceae) in southeastern Nebraska. Phytoneuron. 10 July 2013. 2013-44. 1–23. dmy-all . https://web.archive.org/web/20221005161308/https://www.phytoneuron.net/2013Phytoneuron/44PhytoN-Elmhybrid.pdf . 2022-10-05 . 25 October 2017. 2153-733X.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Ulmus × intermedia 'Rosehill'".

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