Leontopodium japonicum; Japanese edelweiss
A perennial plant native to Japan, closely related to the European edelweiss. The name is usually written in katakana.
Usuyukisō is a type of alpine plant.
On this mountain, you can see Japanese edelweiss in summer.
Standard katakana spelling for this plant name.
Kanji spelling is rare; the plant name is usually written in kana.
From 薄雪 (usuyuki, 'light snow') + 草 (sō, 'grass, plant'), referring to the plant's white, fuzzy appearance resembling light snow.