Polka dot grass - Circaea mollis Sieb.et Zucc.

Japanese: ミズタマソウ(水玉草) - ミズタマソウ(英語表記)Circaea mollis Sieb.et Zucc.
Polka dot grass - Circaea mollis Sieb.et Zucc.
A perennial herb of the Onagraceae family (illustration). It grows in colonies under or on the forest edges of hilly or low mountainous areas, and is widely distributed throughout Japan, Korea, China, and the Indochina Peninsula. The Japanese name was given to this plant because the spherical nuts that grow in a raceme resemble polka dots. It grows by extending slender creeping branches underground. The plant is 30-50 cm tall, and the stems and inflorescences have short, curvaceous hairs. The leaves grow in pairs, and the leaf blades are long and ovate, 5-10 cm long, 2-5 cm wide, and have long stalks. The inflorescences grow in the axils of the terminal and upper leaves, and can reach up to 15 cm in length.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
アカバナ科の多年草(イラスト)。丘陵帯ないし低山帯の林下や林縁に群生し,日本全国のほか,朝鮮,中国,インドシナ半島に広く分布している。総状花序に並んで生ずる球形の堅果を水玉にたとえて和名がついた。地下に細長い匍匐(ほふく)枝をのばしてふえる。草丈は30~50cm,茎や花序に短い屈毛がある。葉は数対が対生し,葉身は長卵形で長さ5~10cm,幅2~5cm,長い柄がある。花序は頂生および上葉に腋生(えきせい)し,長いものは15cmに及ぶ。

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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