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Clouded Sulphur Butterfly
Clouded Sulphur Butterfly

Photos Kim Hosen
Above - Merrimac Farm; June 2009
Lower left - Merrimac Farm, August 2005

Clouded Sulphur

This small, pale yellow-green butterfly is a common throughout much of North America, often seen in fields, lawns, and roadsides. The caterpillars feed on a wide variety of host plants, including alfalfa, black locust, and several types of clover, which may account for the breadth of the species' range.

The wings can range from white to yellow to pale green in color, with black borders, and a usual width of 32 to 54 millimeters. In females, the black border of the wings is often spotted with white or yellow. The forewings are each marked with a prominent black dot, and each hindwing displays a similar spot, these generally reddish-brown, or yellow in white phase individuals.

These butterflies may often be observed congregating en masse around seeps or mud puddles.