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わが国の北海道から本州、おもに日本海側に分布しています。「たにうつぎ(谷空木)」の白花品種ですが、あまり見かけません。日当たりの良い谷間に生え、よく分枝して、高さは5メートルほどになります。葉は卵状楕円形で対生し、先端はするどく尖ります。5月から6月ごろ、枝先や葉腋に散房花序を出し、長さ2〜3センチで白色の漏斗型の花を咲かせます。別名で「しろばなたにうつぎ(白花谷空木)」とも呼ばれます。
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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 hortensis f. albiflora。英名は White Japanese weigela。
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The white Japanese weigela (Weigela hortensis f. albiflora) belongs to Caprifoliaceae (the Honeysuckle family). It is a small deciduous tree that is distributed the Japan Sea Side of Hokkaido to Honshu. It is a white flowered form of the Japanese weigela, but it is rarely seen. This tree grows in sunny dales and much branched, and it can reach about 5 m in height. The leaves are ovate-elliptic and opposite with acute tips. The corymbs are borne at terminal branches or axils, and bloom white funnel-shaped flowers 2-3 cm long from May to June.
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山形県小国町小玉川「樽口峠」にて、2020年05月22日撮影。
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