- Identifying features: Wingspan 2.5-2.75 inches. This is our largest sulphur species. Males are yellow or lemon-yellow and unmarked above; may have a few scattered pinkish dots on underside of wings. Females are similar in color, but wings are fringed with marginal black dots and have a distinct spot in the forewing. White forms are also known.
- Similar species: The Cloudless Giant Sulphur is unique and should not be confused with any other species in the area.
- Habitat: Open areas. Adults take nectar from a variety of flowers, also frequent damp mud and stream banks.
- Larval food plants: Various legumes, especially Cassia.
- Season: Mid-May to October. Migratory species which over-winters primarily in southeastern states. Only member of the genus which breeds in Indiana. Two broods per year in Indiana.
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