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わが国の各地をはじめ、世界中の寒帯や温帯に分布しています。亜高山帯から高山帯の日当たりの良い場所に生え、高さは20〜60センチになります。茎は細く叢生し、葉は線形です。7月から8月ごろ、長い花茎の先に円錐花序を出し、分枝した細い花序に、紫褐色を帯びた小穂をまばらにつけます。
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イネ科コメススキ属の多年草で、学名は Deschampsia flexuosa。英名は Crinkled hairgrass、Wavy hairgrass。
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The Crinkled hairgrass (Deschampsia flexuosa) belongs to Poaceae (the Grass family). It is a perennial herb that is native all over Japan, as well as widely the frozen latitudes and temperate areas. This grass grows in sub-alpine to alpine, sunny places and it can reach 20-60 cm in height. The slender stems are clumping and the leaves are linear. It produce the panicles atop of long flowering stalks from July to August. The purplish-brown spikelets are borne sparsely at the branched slender clusters.
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[上・中1〜5] 福島市土湯温泉町「浄土平」にて、2013年07月20日撮影。 [中6〜中8] 栃木県那須町「茶臼岳」にて、2014年08月14日撮影。 [中9〜10・下] 長野県白馬村「唐松岳」にて、2016年07月30日撮影。
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