Water poppy

Japanese: ミズヒナゲシ（英語表記）water poppy

A perennial aquatic plant of the family Psammaceae native to South America (illustration). It is also called water poppy. It was introduced to Japan in the early Showa period and is now widespread. It has shiny, round, heart-shaped leaves. The rhizome is long and slender, running horizontally, and white. From summer to autumn, beautiful yellow, three-petaled flowers about 5 cm in diameter bloom on pedicels that protrude above the water surface. The Japanese and English names were given to the flower because it resembles a poppy at first glance. The flowers last for only one day, but bloom one after another. It is closely related to the Japanese tochikagami, and is also called kibana tochikagami.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

南アメリカ原産のハナイ科の水生多年草（イラスト）。ウォーター･ポピーともいう。日本へは昭和の初めに渡来し，今では広く普及している。丸いハート形の葉を出し，葉につやがある。根茎は細長く横走して白く，夏から秋へかけて水面上に突出する花梗上に径5cmぐらいの美しい黄色3弁の花を咲かせる。花が一見ケシの花に似るところから，和名も英名もついた。花は一日花であるが，次々と花立ちする。日本のトチカガミに近縁で，キバナトチカガミともいう。

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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