Ulmus bergmanniana - Bergmann's Elm
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| Ulmus bergmanniana C.K.Schneid. |
Bergmann's Elm Ulmus bergmanniana C. K. Schneid. is a deciduous tree found across much of China in forests at elevations of between 1500 m and 3000 m. It is very closely related to the Wych Elm Ulmus glabra. The tree can reach a height of 26 m with a wide-spreading crown, and a trunk of about 0.9 m d.b.h [1]. The bark is longitudinally fissured, and varies in colour from greyish-white to dark grey. The leaves range from obovate to elliptic in shape, and are up to 16 cm long and bluish-green in colour [2] [2]. The wind-pollinated petal-less flowers are produced on second-year shoots in February, followed by generally orbicular samarae up to 16 mm in diameter. The shoots do not possess the corky wings characteristic of many other elm species. In trials [3] in Oklahoma it was found to be eschewed by Elm Leaf Beetles.
The tree was introduced to the West in 1900. There are no known cultivars of this taxon, nor is it known to be available in any nurseries beyond the USA.
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[edit] Subspecies & varieties
Two varieties are recognized: var. bergmanniana L.K.Fu, and var. lasiophylla C.K.Schneid..
[edit] Arboreta etc accessions
- North America
- Chicago Botanic Garden, Glencoe, Illinois. Planted in West Collections Area.
- Denver Botanic Gardens, (no acc. no. available).
- Morton Arboretum, acc. no. 44-95. Obtained from Yunnan Province, China.
- Europe
- Grange Farm, Sutton St. James, Spalding, Lincolnshire, UK, acc. no. 507
- Royal Botanic Gardens Edinburgh, UK, acc. no. 20030262, origin unknown
- Royal Botanic Gardens, Kew, UK, acc. no. 1973-11708. Tree planted 1972, British champion tree, 8 m high, 34cm d.b.h. in 2001 [3].; origin undisclosed.
[edit] Nurseries
- North America
[edit] Etymology
Unclear; possibly named for the American botanist Louis Susette Bergmann, (1868-?).
[edit] References
- ^ 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 10-193-072340-7 [1]
- ^ White, J. & More, D. (2003). Trees of Britain & Northern Europe. Cassell's, London. ISBN 0-304-361192-5
- ^ Johnson, Owen (ed.) (2003). Champion Trees of Britain & Ireland. Whittet Press, ISBN 9781873580615.
