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
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
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わが国の北海道東部や南西部の余市山系、本州の日光や尾瀬、それに北半球の亜寒帯地域に分布しています。湖沼周辺の湿地などに生え、高さは5センチほどになります。茎は細くて地面を這い、葉は糸状です。7月から9月ごろ、茎頂に直径1センチほどの黄色い花を咲かせます。花弁は5〜9個あります。
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キンポウゲ科キンポウゲ属の多年草で、学名は Ranunculus reptans。英名は Creeping spearwort。
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The Creeping spearwort (Ranunculus reptans) belongs to Ranunculaceae (the Buttercup family). It is a perennial herb that is native to eastern and south-western Hokkaido; the Yoich Mountains, Nikko and Oze in Honshu, and the subarctic region of Northern Hemispere. This herb grows in marshes around lakes and can reach about 5 cm in height. The stems are slender and creeping on the ground, and the leaves are filiform. The yellow flowers about 1 cm across bloom on the terminal apices from July to September. The flower has 5-9 petals.
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[上・中1] 茨城県つくば市「つくば実験植物園」にて、2009年09月19日撮影。 [中2〜3・下] 大阪府交野市「大阪市大付属植物園」にて、2006年06月21日撮影。
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