Ranzania (Japanese: トガクシショウマ) is a monotypic genus of perennial herbs in the family Berberidaceae the only species is Ranzania japonica. It is native to woodlands in the mountains of Honshu Japan. This genus is named in honor of Ono Ranzan who has been called the Japanese Linnaeus. Fleshy stems of Ranzania form small colonies from an underground rhizome.
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