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''Stuckenia vaginata'' (syn. ''Potamogeton vaginatus''), commonly called sheathed pondweed, big sheathed pondweed or large-sheathed pondweed is a water plant species that grows in fresh and brackish water in Europe, Northern Asia (excluding China) and North America. Sheathed pondweed is rare, but is not in the 2012 IUCN Red List. ''Stuckenia vaginata'' is a fully submerged aquatic plant and does not have any floating or emerged leaves. The flowers are wind pollinated and the seeds float. Tubers that are rich in starch are formed on the rhizomes. Reproduction can either be vegetative with tubers and plant fragments or sexual with seeds. == Description == Image:Stuckenia vaginata.jpg The main difference between ''Stuckenia'' and ''Potamogeton'' is that the stipule joins the leaf base; when it is pulled the sheath and stipule comes away, similar to a grass sheath and ligule. ''Stuckenia vaginata'' is 1–4 metres long and has longer stipule sheaths than e.g. ''Stuckenia pecinata'' and ''Stuckenia filiformis''. Similar to them, it has long narrow linear leaves. 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「Stuckenia vaginata」の詳細全文を読む スポンサード リンク
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