Iris ensata

Iris ensata, the Japanese iris or Japanese water iris (Japanese: hanashōbu, ハナショウブ), formerly I. kaempferi, is a species of flowering plant in the family Iridaceae, native to Japan, China, Korea and Russia, and widely cultivated as an ornamental plant. "Japanese iris" may also refer to I. sanguinea and I. laevigata, both native to Japan.