Euchloe simplonia, the mountain dappled white, is a butterfly found in the mountainous regions of Western Europe. Its main foods are Sinapis, Isatis, Aethionema, Iberis and Biscutella species. Though data are lacking, it is believed that the species is restricted to a small area of the western Alps and is endangered in Europe.van Swaay, C. and M. Warren (1999). Red Data Book of European Butterflies (Rhopalocera), pg 93. The species is closely related to Euchloe naina, and cross-breeding experiments suggest that E. nania may be a subspecies,Back, W. (1990). "Taxonomic Studies Within the Euchloe-ausonia Huebner 1804 Species Group (Lepidoptera, Pieridae)." Atalanta (Marktleuthen) 21(3-4): 187-206. though this is contested on morphological grounds.Dubatolov, V.V. and O.E. Kosterin (1994). "A new subspecies of the Euchloe ausonia Huebner species group from the highlands of the Dzungarian Alatau (East Kazakhstan) (Lepidoptera, Pieridae)." Atalanta (Marktleuthen) 25(3-4): 513-520
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