| 翻訳と辞書 |
Ulmus alata
''Ulmus alata'', the winged elm or wahoo, is a small- to medium-sized deciduous tree endemic to the woodlands of the southeastern and south-central United States. The species is tolerant of a wide range of soils, and of ponding, but is the least shade-tolerant of the North American elms. Its growth rate is often very slow, the trunk increasing in diameter by <5 mm (0.2 in) per annum. The tree is occasionally considered a nuisance as it readily invades old fields, forest clearings, and rangelands, proving particularly difficult to eradicate with herbicides.〔University of Florida, Environmental Horticulture Department (1994). ''Fact Sheet ST-648''. Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences.〕
==Description==
As its common and scientific〔"''Alata''" means "winged".〕 names imply, ''Ulmus alata'' is most easily recognized by the very broad, thin pair of corky wings that form along the branchlets after a couple of years. The tree generally grows to a maximum height and breadth of about 13 × 13 m, although on fertile alluvial soils such as those of the Mississippi River Delta, some specimens have reached double this height (see 'Notable trees' below). The crown can be either rounded or pyramidal; the branches are pendulous.()
The leaves are comparatively small for the genus, <6.5 cm (2.5 in) long and <2.0 cm (0.8 in) broad, oblong-lanceolate to narrowly elliptic, thin in texture, and smooth above. The wind-pollinated perfect apetalous flowers are borne on long pedicels in March and April before the leaves appear. The reddish samarae are also relatively small, <8 mm long, narrowly elliptic with two long incurving stigmas at the tip,〔Photo of ''U. alata'' samarae, jimbotany.com/16-Catalog_Ra_through_Z-Ackn-LitCitd.htm, ()〕 and usually disperse before the end of April.〔Elwes, H. J. & Henry, A. (1913). ''(The Trees of Great Britain & Ireland )''. Vol. VII. 1848–1929. Republished 2014 Cambridge University Press, ISBN 9781108069380〕〔Schnelle, M. (1999). Field Notes: Ulmus alata. ''American Nurseryman'', page 1998, 1 March 1999. p. 98. Chicago〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
■ウィキペディアで「Ulmus alata」の詳細全文を読む
スポンサード リンク
| 翻訳と辞書 : 翻訳のためのインターネットリソース |
Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.
|
|
