| 词条 | Ulmus castaneifolia |
| 释义 |
|image = Castaneafolia.jpg |image_caption = Chestnut-leafed elm aged 15 years, Sir Harold Hillier Gardens, UK |genus = Ulmus |species = castaneifolia |authority = Hemsley |synonyms = *Ulmus ferruginea W. C. Cheng
}} Ulmus castaneifolia Hemsley, the chestnut-leafed elm or multinerved elm, is a small deciduous tree found across much of China in broadleaved forests at elevations of {{convert|500|-|1600|m}}. DescriptionThe tree can reach a height of {{convert|20|m}} with a trunk of about 0.5 m d.b.h. The bark is thick with a pronounced corky layer, and is longitudinally fissured. The branchlets are devoid of the corky wings common to many elms. The leaves are generally narrow, ranging from obovate to elliptic, up to 15 cm long, and densely hirsute when young. The perfect wind-pollinated apetalous flowers are produced on second-year shoots in February; the samarae are mostly obovate < 30 × 16 mm.[1][2] Pests and diseasesUlmus castaneifolia is resistant to Dutch elm disease and to elm leaf beetle Xanthogaleruca luteola.[3]CultivationThe species is very rare in cultivation; it was one of 12 Chinese species under evaluation at the Morton Arboretum, Illinois, in 2009 by the late Dr George Ware.[4] In artificial freezing tests at the arboretum,[5] the LT50 (temperature at which 50% of tissues die) was found to be −26 °C. There are no known cultivars of this taxon, nor is it known to be in commerce beyond the USA. Notable treesA UK TROBI champion grows at the Royal Botanic Gardens Kew; planted in 1973, it measured 13 m high by 33 cm d.b.h. in 2010. Another of similar dimensions grows at Calderstones Park, Merseyside.[6] Accessions
References1. ^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|1-930723-40-7}} 2. ^White, J. & More, D. (2003). Trees of Britain & Northern Europe. Cassell's, London. {{ISBN|0304361925}} 3. ^{{Cite web|url=http://www.sunshinenursery.com/survey.htm|access-date=17 July 2017|archiveurl=https://web.archive.org/web/20110719132152/http://www.sunshinenursery.com/survey.htm|title=Elm Leaf Beetle Survey|archive-date=2011-07-19}} 4. ^Dirr, M. (2009). 'Future Tree Selections'. Western, Spring 2009, p.8. Western Nursery & Landscape Association, St Joseph, Missouri.[https://www.yumpu.com/en/document/view/52250445/dr-michael-a-dirr-offering-future-tree-selections/4] 5. ^Shirazi, A. M. & Ware, G. H. (2004). Evaluation of New Elms from China for Cold Hardiness in Northern Latitudes. International Symposium on Asian Plant Diversity & Systematics 2004, Sakura, Japan. 6. ^Johnson, O. (2011). Champion Trees of Britain & Ireland, p. 168. Kew Publishing, Kew, London. {{ISBN|9781842464526}}. External links
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