Long ago the Gulf Fritillary was almost entirely a tropical butterfly, but, for some reason, it has been slowly moving northward in North America and southward in South America. Half a century ago it was found only along the southern border of the United States from southern California, Minnesota, Iowa, and New Jersey where once it was entirely unknown. Since the caterpillar of this butterfly lives mainly on the beautiful passion-flower, it may be that this flower has been introduced more and more into gardens in the northern states.

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