Iris plants dataset 1: Description. This is perhaps the best known database to be found in the pattern recognition literature. The data set contains 3 classes of 50 instances each, where each class refers to a type of iris plant. One class is linearly separable from the other 2; the latter are NOT linearly separable from each other. 2: Type. Classification 3: Origin. Real world 4: Instances. 150 5: Features. 4 6: Classes. 3 7: Missing values. No 8: Header. @relation iris @attribute SepalLength real [4.3, 7.9] @attribute SepalWidth real [2.0, 4.4] @attribute PetalLength real [1.0, 6.9] @attribute PetalWidth real [0.1, 2.5] @attribute Class {Iris-setosa, Iris-versicolor, Iris-virginica} @inputs SepalLength, SepalWidth, PetalLength, PetalWidth @outputs Class