Ammannia multiflora Roxb.

Japanese: ヒメミソハギ（英語表記）Ammannia multiflora Roxb.

An annual plant of the Lythraceae family that grows in wetlands in rice paddies and wilderness areas (illustration). The stem is upright, 20-30cm tall, and branches at the top. The leaves are opposite, linear or lanceolate, and ear-shaped at the base, embracing the stem. The plant is hairless, and the leaves at the top of the branches are small. The flowers are small, about 1.5mm in diameter, and grow sparsely in the leaf axils from summer to autumn. The calyx is tubular-conical with four edges and a four-lobed tip that forms triangular calyx teeth. There are four very small petals. There are four stamens. There is one pistil, which is superior to the ovary and has one style at the end.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

水田や原野の湿地に生えるミソハギ科の一年草（イラスト）。茎は高さ20～30cmで直立し，上部で分枝する。葉は対生し，線形または披針形で，基部は耳形に張り出して茎を抱く。全体に毛がなく，枝の上につく葉は小型になる。花は小さく，夏から秋にかけて葉腋（ようえき）にむらがってつき，径約1.5mm。萼は筒円錐形で4稜があり，先は4裂して三角形の萼歯となる。花弁は4枚でごく小さい。おしべは4本。めしべは1本で子房上位，先に1本の花柱がある。

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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