Horsetail (English name) Hippuris vulgaris L.

Japanese: スギナモ（英語表記）Hippuris vulgaris L.

A perennial aquatic plant of the Equisetaceae family. Its English names are mare's-tail, mousetail, and cattail. The stem is erect, 10-60 cm tall, and the upper part usually grows above the water surface and is unbranched. The leaves appear to be clustered at the top of the stem, but 4-12 leaves grow in whorls, are linear, 1-2 cm long, and often slightly curved. The flowers that bloom in summer are small, and are mostly bisexual, but sometimes unisexual flowers are produced. They are found in the axils of the above-water leaves, lack perianths, have a lower ovary, and have one stamen.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

スギナモ科の多年生水生植物。英名はmare’s‐tail,mousetail,cattail。茎は直立し，高さ10～60cm，上部は通常水面より伸び出し，分枝しない。葉は茎の上部に群がりついているように見えるが，4～12枚が輪生し，線形で，長さ1～2cm，少し湾曲することが多い。夏に咲く花は小さく，多くは両性だが単性花を生じることもある。水上葉の葉腋（ようえき）につき，花被を欠き，子房は下位，おしべは1本。

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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