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わが国の本州、宮城県以南の太平洋側から四国、九州に分布しています。山地の林縁に生え、高さは2〜5メートルになります。葉は楕円形から広楕円形で対生、先端は尖り、縁に細かい鋸歯があります。5月から6月ごろ、枝先や葉腋に散房花序をだし、淡黄白色の花を1〜3個咲かせます。花は後に紅色に変わります。花冠は漏斗形で、先端は5裂します。果実は円筒形の刮ハです。
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スイカズラ科タニウツギ属の落葉低木で、学名は Weigela decora。英名はありません。
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"Nishiki-utsugi" (Weigela decora) belongs to Caprifoliaceae (the Honeysuckle family). It is a small deciduous tree that is distributed from the Pacific side of Miyagi Prefecture of Honshu south to Shikoku and Kyushu. This tree grows in montane forest edges and up to a height of 2-5 m. The leaves are elliptic to broad elliptic, arranged in opposite with acute tips and fine toothed edges. The corymbs are borne at the terminal branches and axils, and bloom 1-3 pale yellowish white flowers from May to June. The flowers will turn rose pink later. The corola is funnel-shaped with five partite tips. The fruits are cylindric seed capsules.
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栃木県那須町湯本にて、2017年06月09日撮影。
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