in taxon plant used for medicine blueflag plant 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. [https://en.wikipedia.org/wiki/Iris_versicolor] PLANTS:IRVE2 harlequin blueflag iris versicolor larger blue flag northern blue flag poison flag purple iris Iris versicolor requires discussion