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わが国の固有種で、各地に分布しています。沿海の山地などに生え、高さは4〜5メートルになります。葉は楕円形から広卵形で、十字対生します。5月から6月ごろ、葉腋や枝先に濃紅色の花を咲かせます。花冠の先端は5裂します。
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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 coraeensis f. rubriflora。英名はありません。
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"Benibana-hakone-utsugi" (Weigela coraeensis f. rubriflora) belongs to Caprifoliaceae (the Honeysuckle family). It is a small deciduous tree that is an endemic species and distributed to all over Japan. This tree grows in coastal mountains and can reach 4-5 m in height. The leaves are elliptic to broad-ovate and arranged in decussate. The dark rose-pink flowers come in axils and terminal branches from May to June. The corolla is quintuple-lobate at the tips.
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スイス・ベルン州グリンデルワルトにて、2008年06月18日撮影。(photo by Jon Suehiro)
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