Iris versicolor (Northern Blue Flag)
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A clumping iris native to marshes, swamps, and other wetland environments. Tall flowering stalks with blueish-purple blooms rise above narrow, sword-shaped leaves in late spring. Grows 2 to 3 feet tall and 2 to 3 feet wide. Prefers full sun to part shade and medium to wet soil.
Photos courtesy of Missouri Botanical Garden