Ibaramo - Ibaramo

Japanese: イバラモ - いばらも

A submerged annual plant of the family Diptera (illustration) that grows in ponds and streams. The stems rise above the water, are brittle, and easily break at the nodes. There are sparse thorns. The leaves are opposite, stiff and linear, 3-6 cm long and 2-3 mm wide, with serrated edges that end in thorns. The plant is dioecious, and flowers in the leaf axils from July to September. The male flowers are enclosed in transparent bracts that contain only one anther, which is divided into four lobes. The female flowers lack bracts and consist of only one carpel, and contain a single oval seed inside.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

池や小川に生えるイバラモ科の沈水性の一年草（イラスト）。茎は水中に立ち上がり，もろく，節から折れやすい。まばらにとげがある。葉は対生し，硬く線形で長さ3～6cm，幅2～3mm，縁に鋸歯があり，鋸歯の先端はとげとなる。雌雄異株で7～9月に葉腋（ようえき）に花をつける。雄花は透明な苞鞘（ほうしよう）につつまれ，中にただ1個の葯があり，葯は4室に分かれる。雌花には苞鞘がなく，ただ1個の心皮からなり，中に楕円形の種子が1個できる。

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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