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}} ''Iris pseudacorus'' (yellow flag, yellow iris, water flag, lever〔http://www.wab1.info/yellow-iris〕) is a species in the genus ''Iris'', of the family Iridaceae. It is native to Europe, western Asia and northwest Africa. Its specific epithet, meaning "false acorus," refers to the similarity of its leaves to those of ''Acorus calamus'', as they have a prominently veined mid-rib and sword-like shape. ==Growth== It is an herbaceous flowering perennial plant, growing to (or a rare ) tall, with erect leaves up to long and broad. The flowers are bright yellow, across, with the typical iris form. The fruit is a dry capsule long, containing numerous pale brown seeds. ''I. pseudacorus'' grows best in very wet conditions, and is often common in wetlands, where it tolerates submersion, low pH, and anoxic soils. The plant spreads quickly, by both rhizome and water-dispersed seed. It fills a similar niche to that of ''Typha'' and often grows with it, though usually in shallower water. While it is primarily an aquatic plant, the rhizomes can survive prolonged dry conditions. Large ''I. pseudacorus'' stands in western Scotland form a very important feeding and breeding habitat for the endangered corn crake. ''I. pseudacorus'' is one of two iris species native to the United Kingdom, the other being ''Iris foetidissima'' (stinking iris). 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「iris pseudacorus」の詳細全文を読む スポンサード リンク
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