| 词条 | Ulmus canescens |
| 释义 |
|image = U. canescens bark.jpg |image_caption = Bark and young leaves, Antal Ben Shaddad, Jerusalem |genus = Ulmus |species = canescens |authority = Melville |synonyms = * Ulmus campestris var. dalmatica Bald.
}} Ulmus canescens Melville is a small deciduous tree occasionally known by the common names grey elm, grey-leafed elm, and hoary elm. Its natural range extends through the lands of the central and eastern Mediterranean, from southern Italy,[1] the islands of Sicily,[2] Malta,[3] Crete,[4] Rhodes[5] and Cyprus, to Turkey,[6] and as far south as Israel, where it is now considered rare and endangered in the wild.[7] The tree is typically found amidst the comparatively humid coastal woodlands and scrublands. TaxonomyThe taxonomy of the tree remains a matter of contention; some authorities, notably Richens, treated it as a subspecies of Ulmus minor.[8][9] DescriptionThe tree is comparatively small, < 20 m high; the slender trunk, its bark coarsely fissured, supporting a rounded crown. The leaves are elliptic to ovate, bluntly toothed, and densely downy on the underside when mature, imbuing them with a distinctive greyish hue.[10] The young shoots also have a whitish-grey down.[11] The tree flowers in February and March, the round samarae, < 15 mm diameter, deeply notched at the outer end, ripen in April.[12][13] Pests and diseasesU. canescens is highly susceptible to Dutch elm disease. CultivationU. canescens is occasionally planted as a street tree in Israel, notably in Jerusalem near the Damascus Gate along the Prophets Road and Antal Ben Shaddad street. In Nazareth, a line of mature trees is found along the road leading to the Basilica. It is also planted in Jordan, especially Amman. {{citation needed|date=March 2017}} There are no known cultivars of this taxon, nor is it known to be in commerce. Accessions
References1. ^Richens, R. H., Elm (Cambridge 1983), p.18 2. ^Scialabba, A., M. R. Melati, and F. M. Raimondo. "Taxonomic studies on the Sicilian elms: leaf structure of their species and hybrids." Bocconea 5.2 (1997): 493-504. 3. ^Plant: Ulmus canescens (Hoary Elm): Wild Plants of Malta & Gozo - Plant: Ulmus canescens (Hoary Elm), accessdate: October 27, 2016 4. ^'Canescens' in Crete, (1) in the Apokoronas region: George Sfikas, Trees and shrubs of Greece (Athens, 2nd ed. 2001) p.140; (2) in the Aghia Irene gorge in the Temenos region: Natural Europe Project, University of Crete, europeana.eu [https://www.europeana.eu/portal/record/2023901/content_7af226a0_c461_4c99_8ce8_9de4e41fa3ac.html https://www.europeana.eu/portal/record/2023901/content_7af226a0_c461_4c99_8ce8_9de4e41fa3ac.html] [https://www.europeana.eu/portal/record/2023901/content_4d069282_11de_4564_a221_670020530ba7.html Small leaved Elm, Ulmus minor subsp. canescens | Avramakis, M.] 5. ^Flore of Rhodes: Ulmus canescens - Flore of Rhodes, accessdate: October 27, 2016 6. ^'Canescens' in Turkey, {{Royal Botanic Garden Edinburgh |id=E00405654}} 7. ^Flora of Israel Online: Ulmus minor Mill. | Flora of Israel Online, accessdate: October 27, 2016 8. ^Richens, R. H. (1983). Elm. Cambridge University Press, England. 9. ^Melville, R. (1978). On the discrimination of species in hybrid swarms with special reference to Ulmus and the nomenclature of U. minor (Mill.) and U. carpinifolia (Gled.). Taxon 27: 345-351 10. ^Herbarium leaf-specimen, with rule: {{Royal Botanic Garden Edinburgh |id=E00405654}} 11. ^Diagnostic photographs of 'Canescens' in Malta: Hoary elm, maltawildplants.com 12. ^Bean, W. J. (1980). Trees and shrubs hardy in Great Britain. 8th edition. Murray, UK. 13. ^Melville, R. (1957). [https://www.jstor.org/stable/4113729 "Ulmus canescens: an eastern Mediterranean elm."] Kew Bulletin: 499-502, 1957 14. ^Royal Botanic Garden Edinburgh. (2017). List of Living Accessions: Ulmus External links
13 : Ulmus|Trees of Europe|Trees of Mediterranean climate|Flora of Israel|Flora of Greece|Trees of Asia|Flora of Malta|Flora of Crete|Flora of Sicily|Flora of Cyprus|Vulnerable plants|Ulmus articles with images|Disputed elm species and varieties |
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