Mitella stylosa; a species of miterwort
A specific plant species native to Japan; the name comes from the resemblance of its flower to a charumera (a traditional street-vendor's flute).
Mitella stylosa is a perennial plant that grows in moist mountainous areas.
The name チャルメル草 comes from the resemblance of the flower to a charumera (チャルメラ), a double-reed horn used by street vendors, combined with 草 (grass/herb).