Cloudless Sulphur Caterpillar

Natural Habitat

Cloudless Sulphur caterpillars are typically found in open, sunny areas such as fields, meadows, gardens, and along roadsides where their host plants (Cassia species and other legumes) grow abundantly. They are common in the southeastern United States, extending north into parts of the Midwest and east, and south into Central and South America.

Diet & Feeding

The primary diet of the Cloudless Sulphur caterpillar consists of the leaves of plants in the Leguminosae (pea/bean) family, particularly Cassia species (e.g., Senna obtusifolia, Senna hebecarpa).

Behavior Patterns

As caterpillars, they continuously feed to grow, molting several times. Eventually, they will pupate, forming a chrysalis from which the adult butterfly will emerge. The adult butterflies are known for their strong, rapid flight and often visit flowers for nectar.

Risks & Benefits

Risks: Generally, these caterpillars pose no direct risk to humans. They are not known to be pests of agricultural crops, though they may consume leaves of ornamental legumes. Benefits: As caterpillars, they are part of the food chain, serving as a food source for birds and other predators. As adult butterflies, they are important pollinators for various flowering plants, contributing to ecosystem health and plant reproduction.

Identified on: 8/14/2025