The Iris flower data set or Fisher iris data set is a multivariate data set introduced by Ronald Fisher in his 1936 article, The use of multiple measurements in taxonomic problems as an example of linear discriminant analysis.1 Sometimes called Anderson’s Iris data set because Edgar Anderson collected the data to quantify the morphological variation of the Iris flower from three related species. Two of the three species were collected in the Gaspesian Peninsula "all from the same pasture, and all collected on the same day and measured at the same time by the same person with the same device.
For more details on the iris database see https://es.wikipedia.org/wiki/Conjunto_de_datos_flor_iris.