Ulmus_bergmanniana
Ulmus bergmanniana
Species of tree
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 | |
Kingdom: | Plantae |
Clade: | Tracheophytes |
Clade: | Angiosperms |
Clade: | Eudicots |
Clade: | Rosids |
Order: | Rosales |
Family: | Ulmaceae |
Genus: | Ulmus |
Species: | U. bergmanniana |
Binomial name | |
Ulmus bergmanniana | |
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][8] Schneider's leaf-drawing (1907) shows a short wych-like petiole.[9] The perfect, wind-pollinated apetalous flowers are produced on second-year shoots in February,[10] 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.[11] Branchlets do not possess the corky wings characteristic of many other elm species.
U. bergmanniana has a moderate resistance to Dutch elm disease; in trials [12] 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.[13]
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.[14][15] There are no known cultivars of this taxon.
Two varieties are recognized: var. bergmanniana L.K.Fu, and var. lasiophylla C.K.Schneid..
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]
- North America
- Brenton Arboretum, US.
- Chicago Botanic Garden, US. Planted in West Collections Area.
- Denver Botanic Gardens, US. No acc. no. available.
- Morton Arboretum, US. acc. no. 44-95. Obtained from Yunnan Province, China.
- United States National Arboretum, Washington, D.C., US. Acc. nos. 68997, 76216, 76217, 76242, 68977.
- Europe
- Wijdemeren City Council, Netherlands. Elm collection. Planted 2013 Smeerdijkgaarde, Kortenhoef.
- Europe
- Pan-Global Plants , Frampton-on-Severn, Gloucestershire, UK.
- , Richens, R. H., Elm (Cambridge, 1983), p.87
- 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
- White, J. & More, D. (2003). Trees of Britain & Northern Europe. Cassell's, London. ISBN 0304361925
- "Ulmus bergmanniana - 1". Herbarium catalogue. Board of Trustees of the Royal Botanic Gardens, Kew. Retrieved 17 October 2016.; "Ulmus bergmanniana - 2". Herbarium catalogue. Board of Trustees of the Royal Botanic Gardens, Kew. Retrieved 17 October 2016.
- "Herbarium specimen - L.1590718". Botany catalogues. Naturalis Biodiversity Center. Sheet labelled U. bergmanniana Schneid., new leaves and samarae, Kew Gardens specimen (1960)
- "Elm Leaf Beetle Survey". Archived from the original on 2011-07-19. Retrieved 17 July 2017.
- Grimshaw, J. & Bayton, R. (2009). New Trees - Recent Introductions to Cultivation. RBG Kew, London. ISBN 978-1-84246-173-0
- U. bergmanniana description, efloras.org
- U. bergmanniana leaves and fruit illustration, efloras.org
- Photographs (tree, leaves and fruit) labelled U. bergmanniana (18 pages) on Plant Photo Bank of China, ppbc.iplant
- U. bergmanniana, Kew Gardens 'Plants of the World Online' (herbarium specimen not matching efloras illustration above)
- U. bergmanniana description, and photographs labelled Bergmann's elm, ulmen-handbuch.de