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わが国の固有種で、本州の八方尾根だけに分布しています。「うすゆきそう」の一品種です。高山帯の蛇紋岩地の砂礫地に生え、高さは１０〜３０センチになります。葉は狭い披針形で互生し、斜上します。葉の両面には、綿毛が生えます。７月から８月ごろ、茎頂に小さな頭花を咲かせます。頭花は、白い綿毛が密生した苞葉に囲まれます。
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キク科ウスユキソウ属の多年草で、学名は Leontopodium japonicum f. happoense。英名はありません。
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"Happo-usuyuki-so" (Leontopodium japonicum f. happoense) belongs to Asteraceae (the Aster family). It is a perennial herb that is an endemic species of Japan, and distributed only to the Happoone (Happo Ridge) in Nagano Prefecture. It is a form of "Usuyuki-so" (Leontopodium japonicum). This herb grows in alpine screes on serpentine soils, and can reach 10-30 cm in height. The leaves are narrow lanceolate, alternate and ascending. The both sides of leaf is covered with wooly hairs. The small flowers-heads bloom atop of stems from July to August. They are surrounded by white bracts which covered with dense wooly hairs.
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長野県白馬村「八方尾根」にて、2016年07月31日撮影。
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はっぽううすゆきそう (八方薄雪草)
shu@botanic.jp