| 翻訳と辞書 |
| Black willow ： ウィキペディア英語版 |
Salix nigra
''Salix nigra'' (black willow) is a species of willow native to eastern North America, from New Brunswick and southern Ontario west to Minnesota, and south to northern Florida and Texas.〔Germplasm Resources Information Network: (''Salix nigra'' )〕
==Description==
It is a medium-sized deciduous tree, the largest North American species of willow, growing to tall, exceptionally up to , with a trunk diameter. The bark is dark brown to blackish, becoming fissured in older trees, and frequently forking near the base.〔Peattie, Donald Culross. Trees You Want to Know. Whitman Publishing Company, Racine, Wisconsin, 1934〕 The shoots are slender and variable in color from green to brown, yellow or purplish; they are (like the related European ''Salix fragilis'') brittle at the base, snapping evenly at the branch junction if bent sharply. The foliage buds are long, with a single, pointed reddish-brown bud scale. The leaves are alternate, long, thin, long and broad, usually somewhat falcate, dark, shiny green on both sides or with a lighter green underside, with a finely serrated margin, a short petiole and a pair of small stipules. It is dioecious, with small, greenish yellow to yellow flowers borne on catkins long in early spring at the same time as the new leaves appear. The fruit is a capsule which splits open when mature to release the numerous minute, down-covered seeds. The leaves turn a lemon yellow in the fall.〔 It is typically found along streams and in swamps.〔Tree Species of the World's Boreal Forests: (''Salix nigra'' )〕〔Trees of the North Carolina Piedmont: (''Salix nigra'' )〕〔New Brunswick tree and shrub species of concern: (''Salix nigra'' )〕
''Salix gooddingii'' (Goodding's willow) is sometimes included in ''S. nigra'' as a variety, as ''S. nigra'' var. ''vallicola'' Dudley; when included, this extends the species' range to western North America. However, the two are usually treated as distinct species.〔USDA Plants Profile: (''Salix gooddingii'' )〕
Another name occasionally used for black willow is "swamp willow", not to be confused with ''Salix myrtilloides'' (swamp willow).
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「Salix nigra」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.
|
|