''Ulmus minor'' 'Hoersholmiensis'

Ulmus minor 'Hoersholmiensis'
'Hoersholmiensis', Amsterdam.
Species Ulmus minor
Cultivar 'Hoersholmiensis'
Origin Hørsholm, Denmark

The Field Elm cultivar Ulmus minor 'Hoersholmiensis' originated from seed sown at the Hørsholm Planteskole, Denmark, c. 1885, where it was propagated by the nursery proprietor Lars Nielsen.[1][2] The Späth nursery of Berlin, however, which marketed 'Hoersholmiensis' in the interwar period, considered it a hybrid rather than a form of field elm,[3] a view shared by Christine Buisman, who in 1931 labelled a herbarium specimen from a Späth-sourced tree in The Hague as a form of Ulmus × hollandica.[4]

Description

The tree has an upright habit and rapid growth. The leaves, 8 – 14 cm long by 3 – 5 cm wide,[1] are lanceolate or narrowly obovate, acuminate at the tip and with a cuneate base, light green in colour,[5] turning a deep yellow in autumn.[6]

Pests and diseases

'Hoersholmiensis' is susceptible to Dutch elm disease and Coral-spot Fungus Nectria cinnabarina.

Cultivation

The tree is cultivated in Denmark, Sweden [7] and Finland.[8] In Denmark it is usually propagated by base-grafting on wych elm.[1] Here the oldest known plantation was 65 trees on the Tuborgvej, Copenhagen, planted in 1906. The Späth nursery of Berlin distributed 'Hoersholmiensis' from the late 1920s.[1] It was planted in the Netherlands, notably along the Westlandsgracht in Amsterdam where it still survives, although upper branches are often killed by Coral-spot Fungus. Fontaine reported it a useful wind-break tree.[8]

Putative specimens

The tree has reputedly been planted in Hove,[9] but does not feature in the NCCPG National Elm Collection held there.[10]

Notable trees

Fine unpruned specimens stand in Stockholm, in Raoul Wallenberg square and the Karlaplan.[11]

Hybrid cultivars

The tree was hybridized with 'Commelin' and U. pumila as part of the Dutch elm breeding programme at the De Dorschkamp Institute, Wageningen. Seeds arising from the crossing were donated by Hans Heybroek to the University of Wisconsin-Madison programme in 1960. The clone 'Regal' was a frost-hardy selection from the resultant seedlings, whilst the later 1984 USDA release 'Homestead' arose from the crossing of another with U. pumila.

Synonymy

  • Ulmus carpinifolia 'Hoersholm': Krüssmann, Handbuch der Laubgehölze 2: 534, 1962
  • Ulmus carpinifolia 'Hoersholmensis': Mededeeling, Comite inzake Bestudeering en Bestrijding van de Iepenziekte, 13: 10, 1933
  • Ulmus carpinifolia 'Hoersholmii': Plant Buyer's Guide, ed. 6, 285, 1958
  • Ulmus carpinifolia var. horsholmii: Melville, Journal of the Linnean Society of London, Botany, 53: 88, 90. 1946

Accessions

Europe

Nurseries

Europe

References

  1. 1 2 3 4 Østergaard, Jens (1951). "Hørsholm-elmen, et værdifuldt vej- og alletræ". Lustgården. 31-32: 60–71. Retrieved 13 February 2018.
  2. ↑ Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. 24 (6–8): 41–80. Retrieved 16 February 2017.
  3. ↑ Späth, Ludwig (1930). Späth-Buch, 1720-1930. Berlin: Self published. pp. 311–313, 351–352.
  4. ↑ Ulmus hollandica Miller var. horsholmiensis; Den Haag 1931; naturalis.nl, specimen L.1587076
  5. ↑ Bean, W. J. (1980) Trees and shrubs hardy in Great Britain (8th edition). Murray, UK.
  6. ↑ Photograph of autumn colouring of 'Hoersholmiensis' in Kista, Sweden, www.tradgardsakademin.se - photo 4 .
  7. ↑ Lagerstedt, Lars (2014). "Märkesträd i Sverige - 10 Almar" [Notable trees in Sweden - 10 Elms] (PDF). Lustgården. 94: 57, 74. Retrieved 15 May 2018.
  8. 1 2 F. J., Fontaine (1968). "Ulmus". Dendroflora. 5: 37–55. Retrieved 30 August 2017.
  9. ↑ Brighton & Hove City Council, NCCPG Elm Collection, UK. Two putative trees in Hove: 56 Old Shoreham Road, ; and Old Shoreham Road / Burton Villas turn (see 'Putatives' gallery)
  10. ↑ "List of plants in the {elm} collection". Brighton & Hove City Council. Retrieved 23 September 2016.
  11. ↑ Photographs of 'Hoersholmiensis' in Raoul Wallenberg square and the Karlaplan, Stockholm, www.tradgardsakademin.se .
  12. ↑ Centrum voor Botanische Verrijking vzw: Voorraadlijst, accessdate: November 2, 2016
  • "Herbarium specimen - 2683300" New York Botanical Garden Steere Herbarium Sheet labelled Ulmus 'Hoersholmiensis' NYBG specimen, from Späth nursery (1934)
  • "Herbarium specimen - L.1587076". Botany catalogues. Naturalis Biodiversity Center. Juvenile long shoot; sheet labelled Ulmus hollandica Miller var. horsholmiensis; Den Haag 1931 specimen, from Späth
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