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This famous (Fisher’s or Anderson’s) iris data set gives the measurements in centimeters of:

• the sepal length (Sepal.Length),
• the sepal width (Sepal.Width),
• the petal length (Petal.Length), and
• the petal width (Petal.Width),

for 50 flowers from each of 3 species (Species) of iris. The species are: setosa, versicolor, and virginica.

The data were collected by Anderson, Edgar (1935). The irises of the Gaspe Peninsula, Bulletin of the American Iris Society, 59, 2–5.

More details about the data are provided here