A small annual plant of the Scrophulariaceae family that grows in marshes (illustration). It can become a weed in paddy fields. The stems are soft and cylindrical, 10-25 cm tall. The leaves are opposite. The leaves at the base are narrowly oblong, 10-25 mm long, 3-5 mm wide, and lack serrations. The leaves become smaller as they move up the stem. From summer to autumn, one flower is produced at each leaf axil. Sessile closed flowers are produced at the axils of the leaves in the middle of the stem, and normal flowers with stalks are produced at the axils of the leaves at the top. The corolla is labiate, pale purple, and 5-6 mm long. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
湿地に生えるゴマノハグサ科の小さな一年草(イラスト)。水田雑草になる。茎は柔らかく円柱状で高さ10~25cm。葉は対生。根ぎわの葉は狭長楕円形で柄がなく,長さ10~25mm,幅3~5mm,鋸歯がない。葉は茎の上方にいくにしたがい小さくなる。夏から秋にかけて葉のわきごとに1花をつける。茎の中部の葉のわきには柄のない閉鎖花をつけ,上部の葉のわきには柄のある正常花をつける。花冠は唇形,淡紫色で長さ5~6mm。
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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