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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Schoenoplectus hallii ： ウィキペディア英語版 Schoenoplectus hallii ''Schoenoplectus hallii'' is a species of flowering plant in the sedge family known by the common name Hall's bulrush. It is native to the United States, where it has a disjunct distribution, occurring in widely spaced locations throughout the Midwest and East. It is a rare plant.〔(''Schoenoplectus hallii''. ) The Nature Conservancy.〕 This rhizomatous annual, or sometimes perennial,〔Beatty, B. L., et al. (''Schoenoplectus hallii'' (Gray) S.G. Sm. (Hall’s bulrush): A Technical Conservation Assessment. ) Prepared for the USDA Forest Service, Rocky Mountain Region, Species Conservation Project. April 1, 2004.〕 plant has stems which bend down or spread out instead of growing erect. They are up to 80 centimeters long, but often much shorter. The inflorescence contains a few spikelets which are up to 2 centimeters long by 2 to 3 millimeters wide.〔(''Schoenoplectus hallii''. ) Flora of North America.〕 Some flowers may also be produced on short stems that barely emerge from the leaf sheaths later in the season.〔 This species grows in wet, sandy soils next to water bodies such as ponds and lakes. It is adapted to a habitat with fluctuating water levels.〔(''Schoenoplectus hallii''. ) Center for Plant Conservation.〕 This fluctuation prevents many other types of plants from moving into the area and competing with the sedge.〔 Threats to this plant include anything that alters the hydrology of the habitat, for example, anything that prevents the fluctuating water levels and flooding that the plant requires. Other threats include loss of habitat to development or agriculture, livestock activity, off-road vehicle use, pollution, road maintenance, and habitat fragmentation.〔 ==References== 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「Schoenoplectus hallii」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.