Flag iris typically refers to several species of iris plant:
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Iris pseudacorus'', the yellow flag iris
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Iris versicolor
''Iris versicolor'' is also commonly known as the blue flag, harlequin blueflag, larger blue flag, northern blue flag, and poison flag, plus other variations of these names, and in Britain and Ireland as purple iris.
It is a species of ''Iris'' ...
'', the larger blue flag iris
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Iris prismatica
''Iris prismatica'', the slender blue flag or cubeseed iris,Donald Wyman is a plant species native to parts of the southern and eastern United States from Maine south to Alabama, as well as to the Canadian provinces of Ontario and Nova Scotia.
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'', the slender blue flag iris
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