Water arum

Japanese: ヒメカイウ（英語表記）water arum

A perennial marsh plant (illustration) of the Araceae family found in cold regions of the Northern Hemisphere. Also known as water lily. The stems creep over the ground or float on the water in marshes, and produce leaves with long petioles (10-25 cm). The base of the petiole clasps the stem, and the upper part of the leaf sheath becomes a tongue-like piece that is separated from the petiole. The leaf blade is cordate to broadly ovate, and the largest can reach a length of over 10 cm. In summer, flower stalks longer than the petioles grow from the leaf axils, and produce white, oval, widely opened bracts about 10 cm long, and shorter spadixes.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

北半球の寒冷な地域に分布するサトイモ科の湿地生多年草（イラスト）。ミズザゼンともいう。茎は湿地の地表をはうか水面に浮かび，長い葉柄(10～25cm)のある葉を出す。葉柄基部は茎を抱き，葉鞘（ようしよう）部の上部は葉柄から遊離した舌状片となる。葉身は心形から広卵形で，大きなもので長さ10cmあまりになる。夏，葉腋（ようえき）から葉柄よりも長い花茎を出し，白色で卵状の広く開いた長さ10cmほどの苞と，それよりも短い肉穂花序をつける。

出典　株式会社平凡社世界大百科事典第２版について　情報

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