Iris laevigata

Iris laevigata, known as Japanese iris, rabbit-ear iris, or shallow-flowered iris (Japanese: kakitsubata カキツバタ), is a species of flowering plant in the family Iridaceae, native to Japan. It is related to other members of Iris subgenus Limniris, including other species of Japanese irises. It is found growing in shallow waters and seems to prefer marshy and still ponds, although it can also be grown in damp soil if conditions are right. Flowers are usually blue, purple, or violet and have unique colour patterns, including some types with predominantly white flowers with blue spots (washino-o), and dark purples bordered with white (maikujaku). Synonyms include I. albopurpurea and I. phragmitetorum....read more on Wikipedia.