Ranzania japonica

Ranzania (トガクシソウ, Togakushisou) is a monotypic genus of perennial herbs in the family Berberidaceae.

This genus is named in honor of Ono Ranzan, who has been called "the Japanese Linnaeus".

[1] Fleshy stems of Ranzania form small colonies from an underground rhizome.

Each stem bears two trifoliate compound leaves, and between the leaves is a single or more commonly a small cluster of drooping cup-shaped mauve flowers.

These develop into an upright cluster of white berries.