- Identifying features: Wingspan 1-1.5 inches. Wings in both species are most commonly bright yellow with black borders, however they may range from pale yellow to yellow-orange. The hindwing black border may be reduced or absent in some females.
- Similar species: May be confused with the Clouded Sulphur, however, it is much smaller than the latter species and lacks wing-cell spots.
- Habitat: Found along roadsides, in clover and alfalfa fields, and in open areas near trees. Tends to fly low. This species is highly migratory, occasionally being observed in large swarms. It is a resident of tropical America and the southern U.S. It regularly extends as far North as Canada during the summer.
- Larval food plants: feeds on a wide variety of legumes, especially alfalfa.
- Season: Late May through September; however some years it may be uncommon or absent. There are several generations here during the summer.
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