Pterygopleurum neurophyllum (English spelling) Pterygopleurumneurophyllum

...A perennial herb 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. ...

*Some of the terminology that mentions "Pterygopleurum neurophyllum" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…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。…

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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