150 flowers, 4 measurements (cm)
species
setosa        50
versicolor    50
virginica     50

            sepal_len  sepal_wid  petal_len  petal_wid
species                                               
setosa           5.01       3.43       1.46       0.25
versicolor       5.94       2.77       4.26       1.33
virginica        6.59       2.97       5.55       2.03
