Scilla has most recently been classified as belonging to the family Asparagaceae, subfamily Scilloideae; the subfamily was formerly treated as a separate family, Hyacinthaceae. Prior to that it was placed in the Hyacintheae tribe of the Liliaceae family.
The precise number of Scilla species in the genus depends on which proposals to split the genus are accepted. For a discussion of the relationship of Scilla to the closely related genus, Chionodoxa, see that page. Other proposals separate particularly the Eurasian species into a number of smaller genera such as Othocallis Salisb., e.g. Scilla siberica would become Othocallis siberica.
Scilla peruviana is of interest for its name; it is a native of southwest Europe, not of Peru. When Carolus Linnaeus described the species in 1753, he was given specimens imported from Spain aboard a ship named Peru, and was misled into thinking the specimens had come from that country. The rules of botanical naming do not allow a scientific name to be changed merely because it is potentially confusing.
Cultivation and uses
Many species, notably S. siberica, are grown in gardens for their attractive early spring flowers.
^Chase, M.W.; Reveal, J.L. & Fay, M.F. (2009), "A subfamilial classification for the expanded asparagalean families Amaryllidaceae, Asparagaceae and Xanthorrhoeaceae", Botanical Journal of the Linnean Society161 (2): 132–136, doi:10.1111/j.1095-8339.2009.00999.x