Eurema smilax, the small grass yellow, is a small pierid butterfly species found in Australia, including Lord Howe Island. It is also present on Java.[1]
The wingspan is about 30 mm. The upper surfaces of the wings are yellow with a black band around the edge, and a black dot near the middle. The undersides are yellow with variable brown markings.[2]The species exhibits seasonal wet-season and dry-season forms.
The larvae have been recorded feeding on Cassia fistula, Neptunia monosperma, Neptunia gracilis, Senna acclinis, Senna coriacea, Senna coronilloides, Cassia nemophila, Senna artemisioides petiolaris and Senna guadichaudii.