Blue Flag Irises - Iris versicolor

USDA Forest Service Celebrating Wildflowers

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	Beauty of It All Our Native Irises Blue Flag Our Native Irises: Blue Flag Irises Iris versicolor: Harlequin Blue Flag Iris The harlequin blue flag iris occurs from Newfoundland to Manitoba south to Minnesota and Virginia. Note how the style arms of this Iris versicolor arch over the lower portion of the sepal. In this image, the ant is a probable nectar robber and not a potential pollinator. Photo by Charles and Diane Peirce, Michigan Wildflowers. Range map of Iris versicolor. Courtesy of the USDA PLANTS Database. *Iris versicolor* has a deep blue to purple, rarely white flower. The spreading sepals have purple veins as they gradually narrow to a white base, with a pubescent, greenish yellow signal. Northern blue flag iris flowers in late spring on a compact two to four flowered inflorescence. The bluish-green leaves are wide arching, up to four feet long and arise from shallowly rooted, large, branching rhizomes forming clumps. *Iris versicolor* is commonly found growing on lake shores, swamps, and wet meadows occasionally in shallow water. As you look into the back of the style arm, notice the partially observable anthers. The prominent veining and yellow signal serve as the nectar guides. Photo by Charles and Diane Peirce, Michigan Wildflowers. A stately view of Iris versicolor. Photo by Charles and Diane Peirce, Michigan Wildflowers. Conservation Concern *Iris pseudoacorus* is an invasive, naturalized, large and vigorous garden escape that is replacing *Iris versicolor* in some locations. For More Information *PLANTS Profile - Iris versicolor, Harlequin Blue Flag Iris*
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