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わが国の本州、山陰地方以北の日本海側から北海道に分布しています。「いぬつげ」の変種で、多雪地の山地の湿地などに生えます。幹の下部は地面を這って広がり、高さは1〜1.5メートルになります。葉は楕円形で硬く、互生します。6月から7月ごろ、葉腋に小さな白い4弁花を咲かせます。雌雄異株で、球形の核果は黒く熟します。
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モチノキ科モチノキ属の常緑低木で、学名は Ilex crenata var. paludosa。英名はありません。
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"Hai-inu-tsuge" (Ilex crenata var. paludosa) belongs to Aquifoliaceae (the Holly family). It is a small evergreen tree that is native from Sanin district to the Japan Sea side of Honshu and Hokkaido. It is a variety of "Inu-tsuge" and grows in the mountain bogs of heavy-snow region. The under stems crawl on the grounds and the plant can reach 1-1.5 m in height. The leaves are elliptic, stiff and arranged oppositely. The small white four-petaled flowers bloom on the axils from June to July. It is dioecious. The fruits are round drupes and ripen black.
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[上・中1〜2] 秋田県藤里町太良「田苗代湿原」にて、2005年07月17日撮影。 [中3・中4] 群馬県沼田市上発地町「玉原湿原」にて、2010年10月17日撮影。 [中5〜中7] 福島県檜枝岐村「燧ヶ岳」にて、2014年09月20日撮影。 [中8〜中10] 宮城県白石市「水芭蕉の森」にて、2017年04月10日撮影。 [中11〜中14] 岩手県八幡平市「御在所湿原」にて、2017年10月09日撮影。 [中15〜中21] 山形県小国町小玉川にて、2018年03月28日撮影。 [中22・下] 宮城県大崎市鳴子温泉「禿岳」にて、2021年11月03日撮影。
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