Ulmus 'Koopmannii'

The elm cultivar Ulmus 'Koopmannii' was cloned from a specimen raised from seed sent from Margilan, Turkestan (now in eastern Uzbekistan) by Koopmann to the Botanischer Garten Berlin c. 1880. Noted in 1881 as a 'new elm',[1] it was later listed by the Späth nursery (Berlin, Germany), catalogue no. 62, p. 6. 101, 1885, as Ulmus Koopmannii, and later by Krüssmann in 1962 as a cultivar of U. minor.[2][3] Margilan is beyond the main range of Ulmus minor.[4] Augustine Henry, who saw the specimens in Berlin and Kew, believed Koopmann's Elm to be a form of Ulmus pumila (Siberian elm),[5] a view not shared by Rehder of the Arbold Arboretum.[6] Ascherson & Graebner said the tree produced 'very numerous root shoots',[7] which suggests it may be a cultivar of U. minor. Until DNA analysis can confirm its origin, the cultivar is now treated as Ulmus 'Koopmannii'.

Ulmus 'Koopmannii'
'Koopmannii' at Arnold Arboretum, 1941
GenusUlmus
Cultivar'Koopmannii'
OriginTurkestan

Description

The tree is said to resemble Ulmus minor 'Umbraculifera' in form, though more globose in outline,[8][9][10] with a dense, narrowish oval crown, a height to 35 feet (11 m),[11] and small, ovate leaves < 30 mm in length.[7][5][12][13] When grafted, the tree has an ovoid head but is shrubby and stoloniferous when propagated by cuttings.[6]

Cultivation

Koopman claimed that 'Koopmannii' was traditionally grown in cemeteries in Turkestan, where it occasionally reached a great size,[7] In the late 19th and early 20th century it was marketed in Europe by Späth, and was represented by a tree in the Berlin Botanical Garden. One tree was planted in 1897 as U. campestris Koopmannii at the Dominion Arboretum, Ottawa, Canada.[14] The tree was introduced to the USA in the late 19th century, appearing as a "new variety" in the 1897 catalogue of the Mount Hope Nursery (also known as Ellwanger and Barry) of Rochester, New York.[15][16] A specimen was once grown at Kew Gardens, where it performed rather poorly. Specimens supplied by Späth to the RBGE in 1902 as U. campestris 'Koopmannii' may survive in Edinburgh as it was the practice of the Garden to distribute trees about the city (viz. the Wentworth Elm);[17] the current list of Living Accessions held in the Garden per se does not list the plant.[18] U. campestris 'Koopmannii' was marketed in the 1930s by the Hesse Nursery of Weener, Germany.[19]

Synonymy
  • Ulmus carpinifolia 'Koopmannii': Morton Arboretum catalogue, 2006.

Accessions

North America

Europe
  • Hortus Botanicus Nationalis, Salaspils, Latvia. acc. no. 18145

References
  1. "Zwei neue Ulmen". Hamburger Garten-und Blumenzeitung. 37: 85. 1881.
  2. Krüssmann, Johann Gerd (1962). Handbuch der Laubgehölze. 2. p. 534.
  3. Krüssmann, Johann Gerd (1984). Manual of Cultivated Broad-Leaved Trees and Shrubs. 3. p. 406.
  4. Ulmus minor range map, linnaeus.nrm.se
  5. Elwes, Henry John; Henry, Augustine (1913). The Trees of Great Britain & Ireland. 7. p. 1927.
  6. Rehder, Alfred (1938). "New species, varieties and combinations from the collections of the Arnold Arboretum". Journal of the Arnold Arboretum. Arnold Arboretum, Harvard University. 9 (1): 273. Retrieved 19 June 2017.
  7. Ascherson, Paul; Graebner, Paul (1913). Synopsis der mitteleuropäischen Flora. 4. p. 557. Retrieved 16 February 2017.
  8. Photograph of Koopmanii': Wyman, Donald (1941-12-19). "Elms grown in America". Arnoldia. Arnold Arboretum, Harvard University. 1 (13): 74. Retrieved 16 February 2017.
  9. Wyman, Donald (1951-12-07). "Elms grown in America". Arnoldia. Arnold Arboretum, Harvard University. 11 (12): 87. Retrieved 16 February 2017.
  10. Buckley, Arthur R. (1980). Trees and shrubs of the Dominion Arboretum. Research Branch, Agriculture Canada. p. 138. Retrieved 20 December 2016.
  11. Wyman, Donald (1951-06-08). "Smaller street trees needed". Arnoldia. Arnold Arboretum, Harvard University. 11 (6): 48. Retrieved 16 February 2017.
  12. Lauche, Willhelm (1883). Deutsche Dendrologie. p. 349. Retrieved 16 February 2017.
  13. Photograph of Koopmanii': "Smooth-Leaved Elms - Ulmus carpinifolia 'Wredei' and 'Koopmanii'". cirrusimage.com. Retrieved 2017-02-16.
  14. Saunders, William; Macoun, William Tyrrell (1899). Catalogue of the trees and shrubs in the arboretum and botanic gardens at the central experimental farm (2 ed.). pp. 74–75.
  15. Ellwanger & Barry, Mount Hope Nurseries, Rochester, 1897 catalogue; p.9
  16. Ellwanger & Barry, Mount Hope Nurseries, Rochester, 1898 catalogue; p.62
  17. Accessions book. Royal Botanic Garden Edinburgh. 1902. pp. 45, 47.
  18. "List of Living Accessions: Ulmus". Royal Botanic Garden Edinburgh. Retrieved 21 September 2016.
  19. Hesse, Hermann Albert (1932). Preis- und Sortenliste. pp. 96–97. Retrieved 18 January 2018.
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