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わが国の北海道西南部から本州、四国・九州に分布しています。高原に多く、高さは1〜2メートルになります。葉は倒披針形で互生し、縁には細毛があります。4月から6月ごろ、枝先の総状花序に、朱橙色の漏斗形花を咲かせます。雄しべは5個です。
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ツツジ科ツツジ属の落葉低木で、学名は Rhododendron japonicum。英名は Japanese azalea。
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The Japanese azalea (Rhododendron japonicum) belongs to Ericaceae (the Azalea family). It is a small decidous tree that is distributed southward from west-eastern Hokkaido to Honshu, Shikoku and Kyushu in Japan. This tree grows in mostly highlands and can reach 1-2 m in height. The leaves are oblanceolate, alternate and grow fine hairs on the edges. The flowers are vermilion-orange, funnel-shaped, and bloom on the terminal racemes from April to June. The flower has five stamens.
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[上・中1] 群馬県嬬恋村門貝にて、2009年05月24日撮影。 [中2] 福島県北塩原村「雄国沼」にて、2009年06月27日撮影。 [中20〜中22] 同上にて、2014年06月15日撮影。 [中3・中4] 福島県北塩原村「デコ平湿原」にて、2009年06月28日撮影。 [中5・中6] 長野県茅野市北山「麦草ヒュッテ」にて、2006年07月08日撮影。 [中8] 同上にて、2006年07月08日撮影。(photo by Jon Suehiro) [中7] 長野県塩尻市片丘「長野県林業総合センター」にて、2005年05月22日撮影。 [中10] 同上にて、2006年04月03日撮影。 [中9] 長野県塩尻市片丘にて、2006年10月19日撮影。 [中11] 長野県大町市八坂「唐花見湿原」にて、2006年05月10日撮影。 [中12・中13] 福島県磐梯町「磐梯山」にて、2012年06月23日撮影。 [中14〜中19] 福島県北塩原村「雄国山」にて、2014年06月15日撮影。 [中23〜中26] 群馬県片品村「尾瀬ヶ原」にて、2015年07月05日撮影。 [中27〜中31] 山形県上山市「坊平高原」にて、2018年05月31日撮影。 [中32〜33・下] 宮城県気仙沼市「徳仙丈山」にて、2021年05月16日撮影。
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