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Ulmus glabra 'Insularis'

From Wikipedia, the free encyclopedia
Elm cultivar
Ulmus glabra 'Insularis'
'Insularis' onVen, Sweden.[1]
SpeciesUlmus glabra
Cultivar'Insularis'
OriginSweden

ThecultivarUlmus glabra 'Insularis' [:'island'[2]], theVen island elm, a fastigiate form ofWych Elm from Sweden, was identified and described by Nilsson inLustgården 30: 127. 1949, asU. glabraHuds. f.insularis.[1][3] Nilsson considered it "closely related to subspeciesmontana(Stokes) Lindqvist". Thecultivar arose from a tree onVen island inÖresund sound, planted c.1900 between Haken and Husvik, possibly from self-sown local seedlings, and approaching 2 m in girth by the late 1940s.[1][4]

Description

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The tree was described by Nilsson as columnar, having a rounded elongate-ovoid crown, and dense sub-erect branches.[3] The relatively elongated leaves are widest above the middle, quite tapered towards a long tip, and tapering to an unsymmetrical base. The margin is triple-toothed.[1] New shoots are downy. Flowers and fruits as in the type. Nilsson (1949) included photographs of the original tree in winter and summer, and a leaves photo.[1]

Pests and diseases

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See underUlmus glabra.

Cultivation

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The horticultural potential of the tree was early recognized and propagation was already under way in Sweden when Nilsson published his 1949 article.[1] The tree was sometimes planted in botanical collections.[5]Krüssmann (1984) contains a photograph of a young specimen in theWageningen Arboretum in the Netherlands.[6]

'Insularis'-like wych elms

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A narrow 'Insularis'-like wych elm that stands before Wright's Houses,Bruntsfield Links, Edinburgh (2018), may pre-date the cultivation of the Swedish clone.[7] Despite being an unpollarded open-grown tree, its branches are mostly steeply ascending. Leaves andsamarae are typical of the species.

  • Bruntsfield Links wych, Edinburgh (April, 2016)
    Bruntsfield Links wych, Edinburgh (April, 2016)
  • Same (October 2016)
    Same (October 2016)
  • Leaves of same
    Leaves of same

References

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  1. ^abcdefNilsson, Arvid (1949)."Venalmen, Ulmus glabra Huds. f. insularis n. f." [The Ven elm, Ulmus glabra Huds. f. insularis n. f.].Lustgården.30:125–129. Retrieved13 February 2018.
  2. ^Lewis, Charlton Thomas (1891).An elementary Latin dictionary. New York: Harper & brothers. p. 428. Retrieved14 February 2018.
  3. ^abGreen, Peter Shaw (1964)."Registration of cultivar names in Ulmus".Arnoldia.24 (6–8).Arnold Arboretum,Harvard University:41–80. Retrieved16 February 2017.
  4. ^Krüssman, Gerd,Manual of Cultivated Broad-Leaved Trees & Shrubs (1984 vol. 3)
  5. ^1964 photo of 'Insularis', Sweden,Lustgården, 1964-65, p.38
  6. ^Krüssman, Gerd,Manual of Cultivated Broad-Leaved Trees & Shrubs (1984 vol. 3, plate 145)
  7. ^Possible 'Insularis' on Bruntsfield Links (second tree from left; Huntingdon Elm on left for comparison): eyeonedinburgh.net[1]
Species, varieties and subspecies
Disputed species, varieties and subspecies
Hybrids
Speciescultivars
American elm
Cedar elm
Chinese elm
European white elm
Field elm
Japanese elm
Siberian elm
Winged elm
Wych elm
Hybridcultivars
Dutch elm
U. ×intermedia
Unconfirmed derivation cultivars
Fossil elms
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