''Ulmus minor'' 'Viminalis Betulaefolia'

Ulmus minor 'Viminalis Betulaefolia'
Species Ulmus minor
Cultivar 'Betulaefolia'

The Field Elm cultivar Ulmus minor 'Viminalis Betulaefolia' (:'birch-leaved') is an elm of uncertain origin.[1] An U. campestris var. betulaefolia was listed by Loddiges of Hackney, London, in the catalogue of 1836,[2] and later by Loudon in Arboretum et Fruticetum Britannicum (1838).[3] Henry described an U. campestris var. betulaefolia at Kew in 1913, obtained from Fulham nurseryman Osborne in 1879, as "scarcely different from var. viminalis" (U. minor 'Viminalis').[4] Melville considered the tree so named at Kew a form of his U. × viminalis,[5] while Bean (1988), describing U. 'Betulaefolia', likewise placed it under U. 'Viminalis' as an apparently allied tree.[1] Loudon and Browne had noted that some forms of 'Viminalis' can be mistaken for a variety of birch.[6][7] An U. campestris betulaefolia was distributed by Hesse's Nurseries, Weener, Germany, in the 1930s.[8]

Henry (1913) also described an U. nitens var. betulaefolia , a cultivar with long, narrow un-birchlike leaves, a herbarium specimen of which from Audley End, Suffolk, is preserved at Kew (see External links below).[9] Henry did not include this cultivar, represented by a specimen in the Cambridge University Botanic Garden, as a form of 'Viminalis', but both he and Green took it to be a synonym of Loudon's 'Betulaefolia'. Melville determined this tree a triple hybrid, U. carpinifolia gled. × U. plotii Druce × U. glabra Huds..[10]

Description

Loudon's U. campestris var. betulaefolia was distinguished by its leaves "somewhat resembling common birch".[11]

Henry's U. nitens var. betulaefolia was "a pyramidal tree with ascending branches, with leaves up to 4 in. by 1.5 in., long-acuminate at the apex and narrowing towards a cuneate but unequal base".[10]

Bean's U. 'Betulaefolia' was an "elegant" tree with pendulous young branchlets, leaves narrowly obovate, 2–2.5 in. by 1.5, rough above, downy in the vein-axils beneath, with deeply toothed margins, the teeth being narrow, incurved, and often double.[1] Wesmael (1863) had likewise described an Ulmus campestris var. nuda subvar. betulaefolia Hort.Vilv. with sharp-pointed double teeth.[12]

Pests and diseases

Trees of the U. × viminalis group are very susceptible to Dutch elm disease.

Cultivation

No specimens of U. × viminalis labelled 'Betulaefolia' are known to survive.

References

  1. 1 2 3 Bean, William Jackson (1988). Trees and shrubs hardy in Great Britain (8 ed.). London: Murray. p. 659.
  2. ↑ Loddiges, Conrad (1836). "Catalogue of plants, in the collection of Conrad Loddiges & Sons, nurserymen, at Hackney, near London". 13: 35.
  3. ↑ Arboretum et Fruticetum Britannicum, 3: 1376, 1838
  4. ↑ Elwes, Henry John; Henry, Augustine (1913). The Trees of Great Britain & Ireland. 7. p. 1906.
  5. ↑ Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. Arnold Arboretum, Harvard University. 24 (6–8): 41–80. Retrieved 16 February 2017.
  6. ↑ Loudon, Arboretum et Fruticetum Britannicum, 3: 1378, 1838
  7. ↑ Browne, D. J. (1846). The Trees of America. Harper & Brothers, New York.
  8. ↑ Hesse, Hermann Albert (1932). Preis- und Sortenliste. pp. 96–97. Retrieved 18 January 2018.
  9. ↑ U. nitens var. betulaefolia Henry, apps.kew.org
  10. 1 2 Elwes, Henry John; Henry, Augustine (1913). The Trees of Great Britain & Ireland. 7. p. 1896.
  11. ↑ Loudon (1838), p.1376
  12. ↑ Wesmael, Alfred (1862). "Bulletin de la Fédération des sociétés d'horticulture de Belgique". p. 389. Retrieved 6 July 2017.
  • "Ulmus nitens v. betulaefolia". Herbarium catalogue. Board of Trustees of the Royal Botanic Gardens, Kew. Retrieved 17 October 2016.
  • "Herbarium specimen - L.1590637". Botany catalogues. Naturalis Biodiversity Center. Sheet described as U. campestris var. betulaefolia (Cambridge, 1930)
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