Ulmus bergmanniana
| Ulmus bergmanniana | |
|---|---|
.JPG) |
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| Bergmann's Elm, Kew, London. Photo: Ronnie Nijboer, Bonte Hoek kwekerijen | |
| Scientific classification | |
| Kingdom: | Plantae |
| Division: | Magnoliophyta |
| Class: | Magnoliopsida |
| Order: | Rosales |
| Family: | Ulmaceae |
| Genus: | Ulmus |
| Species: | U. bergmanniana |
| Binomial name | |
| Ulmus bergmanniana C.K.Schneid. |
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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.
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[edit] Description
The tree is very closely related to the Wych Elm Ulmus glabra; it 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 pubescent leaves range from obovate to elliptic, < 16 cm long, and bluish-green in colour [2].[2] The perfect, wind-pollinated apetalous flowers are produced on second-year shoots in February, followed by generally orbicular samarae < 16 mm in diameter. Branchlets do not possess the corky wings characteristic of many other elm species.
[edit] Pests and diseases
Resistant to Dutch elm disease, in trials [3] in Oklahoma it was also found to be eschewed by the elm leaf beetle Xanthogaleruca luteola [4], but further north at the Morton Arboretum was moderately to highly preferred by the insect. The species is also susceptible to the Elm Leafminer.[3]
[edit] 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. There are no known cultivars of this taxon, nor is it known to be in commerce beyond the USA.
[edit] Subspecies & varieties
Two varieties are recognized: var. bergmanniana L.K.Fu, and var. lasiophylla C.K.Schneid..
[edit] Etymology
Unclear; possibly named for the American botanist Louis Susette Bergmann, (1868-?).
[edit] Accessions
- North America
- Brenton Arboretum, Dallas Center, Iowa. No accession details available.
- 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.
- U S National Arboretum [5], Washington, D.C., USA. Acc. nos. 68997, 76216, 76217, 76242, 68977.
- Europe
- Grange Farm Arboretum, 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, 34 cm d.b.h. in 2001 [4].; origin undisclosed.
[edit] Nurseries
- North America
[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
- ^ Grimshaw, J. & Bayton, R. (2009). New Trees - Recent Introductions to Cultivation. RBG Kew, London. ISBN 9781842461730
- ^ Johnson, Owen (ed.) (2003). Champion Trees of Britain & Ireland. Whittet Press, ISBN 9781873580615.
