Lysimachia (English spelling) Lysimachia nummularia L.

Japanese: リシマキア（英語表記）Lysimachia nummularia L.

A perennial plant of the Primulaceae family native to Europe and the eastern United States. It is also called Euonymus japonica. It is often grown on stone walls and in rock gardens. It is cold-resistant, and does not require frost protection in winter even when grown outdoors. The stem crawls along the ground, growing 60cm in all directions in a year, and roots where it touches the ground, covering the ground. The leaves are opposite, pointed and round, with a diameter of 1.5cm. In June and July, a beautiful bright yellow gamopetalous flower blooms in each axil. The corolla is star-shaped with five deep lobes, and is about 2cm in diameter. If you cut a stolon from the parent plant and lay it on the ground immediately after flowering, it will easily root and propagate.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

ヨーロッパ，アメリカ合衆国東部地方原産のサクラソウ科の多年草。ヨウシュコナスビともいう。石垣やロックガーデンにはわせて観賞する。寒さに強く，冬は露地でも霜よけの必要はない。茎は地をはい，四方に1年で60cmはのび，地に触れたところで発根し，地をおおう。葉は対生し，尖円形で径1.5cm。6～7月に各葉腋（ようえき）に鮮黄色の美しい合弁花を1花つける。花冠は星形に5深裂し，径約2cm。　開花直後に親株から匍匐（ほふく）枝を切って地にふせれば，たやすく発根して繁殖する。

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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