| 词条 | Ulmus lanceifolia | ||
| 释义 |
| image = GFA U. lanceifolia leaves.jpg | image_caption = U. lanceifolia foliage,Grange Farm Arboretum | parent = Ulmus sect. Lanceifolia | display_parents = 2 | genus = Ulmus | species = lanceifolia | authority = Roxburgh ex Wall. | synonyms =
}} Ulmus lanceifolia Roxburgh, ex Wall. , occasionally known as the Vietnam elm, is a very large tree endemic to a wide area of southern Asia. Its range extends southeast and eastwards from Darjeeling in the Himalaya, through Bangladesh, southern China, Myanmar (formerly Burma), Thailand, Laos, Vietnam and on discontinuously into Indonesia, straddling the Equator in Sumatra and Celebes. DescriptionUlmus lanceifolia can reach a maximum height of 45 m, placing it on a par with the English Elm, but with pendulous branches; the bark of the trunk exfoliates in thin scales. The leaves, borne on wing-less branchlets, are narrow, generally lanceolate, < 10 × 3.5 cm, and thick. The tree is deciduous in the north of its range, where it can occur at altitudes of up to 2500 m, but evergreen in the tropics. Given the latitudinal range, there is inevitably a substantial variation in its flowering time, beginning in October in the north, but advancing to February–March in the south. The obovate samarae are 12–30 mm long by 11–24 mm broad.[1][2] Ploidy: 2n = 28Pests and diseasesU. lanceifolia was found to be among the least suitable elms for feeding and reproduction by the adult elm leaf beetle Xanthogaleruca luteola [3] and feeding by the Japanese Beetle Popillia japonica [4] in the United States. CultivationNot cold-hardy, the species is very rare in cultivation; specimens introduced to the Netherlands from the Himalaya by Heybroek in the 1960s all perished.[5] AccessionsEurope
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. 2. ^Melville, R. & Heybroek, H. M. (1971). The Elms of the Himalaya. Kew Bulletin Vol. 26 (1). Royal Botanic Garden, Kew, London. 3. ^{{cite journal | last=Miller | first=Fredric | last2=Ware | first2=George | title=Resistance of Temperate Chinese Elms (Ulmus spp.) to Feeding by the Adult Elm Leaf Beetle (Coleoptera: Chrysomelidae) | journal=Journal of Economic Entomology | publisher=Oxford University Press (OUP) | volume=94 | issue=1 | date=2001-02-01 | issn=0022-0493 | doi=10.1603/0022-0493-94.1.162 | pages=162–166 | ref=harv}} 4. ^{{cite journal | last=Miller | first=Fredric | last2=Ware | first2=George | last3=Jackson | first3=Jennifer | title=Preference of Temperate Chinese Elms ( Ulmus spp.) for the Adult Japanese Beetle (Coleoptera: Scarabaeidae) | journal=Journal of Economic Entomology | publisher=Oxford University Press (OUP) | volume=94 | issue=2 | date=2001-04-01 | issn=0022-0493 | doi=10.1603/0022-0493-94.2.445 | pages=445–448}} 5. ^Heybroek, H. M., Goudzwaard, L, Kaljee, H. (2009). Iep of olm, karakterboom van de Lage Landen (:Elm, a tree with character of the Low Countries). KNNV, Uitgeverij. {{ISBN|9789050112819}} External links
15 : Ulmus|Trees of Indo-China|Trees of Malesia|Trees of Southeast Asia|Trees of Nepal|Trees of India|Trees of China|Flora of Assam (region)|Flora of East Himalaya|Flora of Indo-China|Garden plants of Asia|Ornamental trees|Ulmus articles with images|Elm species and varieties|Flora of tropical Asia |
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