Ulmus bergmanniana

Ulmus bergmanniana C.K.Schneid.,[1] commonly known as Bergmann's elm, is a deciduous tree found across much of China in forests at elevations of 1500–3000 m.[2]

Ulmus bergmanniana
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Rosids
Order: Rosales
Family: Ulmaceae
Genus: Ulmus
Species:
U. bergmanniana
Binomial name
Ulmus bergmanniana

Description

The tree is very closely related to the wych elm Ulmus glabra;[3] it can reach a height of 26 metres (85 ft) with a wide-spreading crown, and a trunk of about 0.9 m d.b.h.[4] The bark is longitudinally fissured, and varies in colour from greyish-white to dark grey.[5] The pubescent leaves range from obovate to elliptic, less than 16 cm (6.3 in) long, and bluish-green when mature.[6][7] Schneider's leaf-drawing (1907) shows a short wych-like petiole.[8] The perfect, wind-pollinated apetalous flowers are produced on second-year shoots in February, followed by generally obovate samarae <30 mm long by 14 mm width, the centre of the seed about 7 mm from the slightly notched apex. Branchlets do not possess the corky wings characteristic of many other elm species.

Pests and diseases

U. bergmanniana has a moderate resistance to Dutch elm disease; in trials [9] in Oklahoma it was also found to be eschewed by the elm leaf beetle Xanthogaleruca luteola , but further north at the Morton Arboretum was moderately to highly preferred by the insect. The species is also susceptible to the elm leafminer.[10]

Cultivation

The tree was introduced to the West in 1900. In trials in the USA it was found to propagate well, and also proved to be very winter hardy. The tree was one of 12 Chinese species under evaluation at the Morton Arboretum, Illinois, in 2009 by the late Dr George Ware.[11][12] There are no known cultivars of this taxon.

Subspecies & varieties

Two varieties are recognized: var. bergmanniana L.K.Fu, and var. lasiophylla C.K.Schneid..

Etymology

The species was named by Camillo Karl Schneider for his friend Carl Bergmann, who assisted in indexing the work in which it was published.[1]

Accessions
North America
Europe
  • Wijdemeren City Council, Netherlands. Elm collection. Planted 2013 Smeerdijkgaarde, Kortenhoef.

Nurseries
Europe

References
  1. Schneider, Camillo Karl, Illustriertes Handbuch der Laubholzkunde (Jena, 1907), p.902
  2. "Ulmus bergmanniana_EOL".
  3. , Richens, R. H., Elm (Cambridge, 1983), p.87
  4. Fu, L., Xin, Y. & Whittemore, A. (2002). Ulmaceae, in Wu, Z. & Raven, P. (eds) Flora of China, Vol. 5 (Ulmaceae through Basellaceae). Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, USA. ISBN 1930723407
  5. U. bergmanniana bark photograph, Xianyang City, Yangling District, Shaanxi Province, China; ppbc.iplant.cn/
  6. "Photograph labelled U. bergmanniana, asianflora Ulmaceae".
  7. White, J. & More, D. (2003). Trees of Britain & Northern Europe. Cassell's, London. ISBN 0304361925
  8. Schneider, Camillo Karl, Illustriertes Handbuch der Laubholzkunde (Jena, 1907), p.903-904
  9. "Elm Leaf Beetle Survey". Archived from the original on 2011-07-19. Retrieved 17 July 2017.
  10. Grimshaw, J. & Bayton, R. (2009). New Trees - Recent Introductions to Cultivation. RBG Kew, London. ISBN 978-1-84246-173-0
  11. Dirr, M. (2009). 'Future Tree Selections'. Western, Spring 2009,  p.8. Western Nursery & Landscape Association, St Joseph, Missouri.
  12. Bergmann's elm at Morton Arboretum; cirrusimage
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