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わが国の固有種で、本州の中部地方以北から北海道に分布しています。高山帯の砂礫地や岩場に生え、高さは2〜8センチになります。よく分枝して広がり、葉は線形で3脈があります。7月から8月ごろ、枝先に直径5ミリほどの小さな白い花を咲かせます。花弁と萼片はほぼ同じ長さです。別名で「こばのつめくさ(小葉の爪草)」とも呼ばれます。
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ナデシコ科タカネツメクサ属の多年草で、学名は Minuartia verna var. japonica。英名はありません。
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"Hosoba-tsume-kusa" (Minuartia verna var. japonica) belongs to Caryophyllaceae (the Carnation family). It is a perennial herb that is endemic to Japan and distributed northward from Chubu district of Honshu to Hokkaido. This herb grows in alpine screes or rocky places, and can reach 2-8 cm in height. The stems are much branched, the leaves are linear and three-veined. It blooms small white flowers, about 5 mm across, atop of stems from July to August. The petals and sepals are about the same length. It is also called "Kobano-tsume-kusa".
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[上・中1〜2] 長野県白馬村北城「八方尾根」にて、2006年08月25日撮影。 [中3〜中8] 岩手県遠野市「早池峰山」にて、2017年07月20日撮影。[下] 同上にて、2017年07月20日撮影。(photo by Aya Seko)
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