Shimura ginseng (English name) Pterygopleurum neurophyllum (Maxim.) Kitagawa

Japanese: シムラニンジン（英語表記）Pterygopleurum neurophyllum (Maxim.) Kitagawa

A perennial plant of the Umbelliferae family that grows in marshes in fields (illustration). The Japanese name comes from the fact that it was common in Shimura-no-hara, Tokyo. The stem is erect, 80-100 cm tall, and slightly ridged. The roots are white and somewhat fleshy. The leaves are twice trilobed, with slender lobes 2-6 mm wide and somewhat hard. The flowers bloom in August and September in compound umbels at the ends of the upper branches, and are small and white. There are 8-10 small umbels with linear bracts. There are five petals that roll inward at the tips. The fruit is elliptical, about 4 mm long, with small triangular calyx teeth at the tip, and an oil tube runs between each of the raised ribs on the surface.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

野原の湿地に生えるセリ科の多年草（イラスト）。和名は東京都の志村の原に多かったことによる。茎は直立して高さ80～100cm，やや稜がある。根は白くやや多肉質。葉は2回3出羽状に分かれ，裂片は幅2～6mmで細長く，やや硬い。花は8～9月ころ，上部の枝先に複散形花序を作って開き，白色で小さい。小散形花序は8～10個あり，線形の小総苞片がある。花弁は5枚で先は内に巻く。果実は楕円形で長さ約4mm，先に小型三角状の萼歯があり，表面の隆起した肋の間に1本ずつの油管が通っている。

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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