Eurema is a widespread genus of grass yellow butterflies in the family Pieridae. Species range from Asia, Africa, Australia, and Oceania, to the New World. The type species is the North American barred yellow (Eurema daira). There are over 70 species in the genus, but more than 300 synonymous names have been applied to them. Some species, such as the common African grass yellow (E. hecabe) have over 80 synonyms. The genus itself has over 15 junior generic synonyms. This is the price of being a widespread taxon, as well as a zoogeographical problem.