The Regal Fritillary (Speyeria idalia) inhabited 14 states on the East Coast until the close of the 20th Century.
Male Fritillaries on Common Milkweed
Regals and their sister species, the Great Spangled Fritillary.
The Regal's Demise
The host plants for Regal Fritillary larva are the Violets of sun-drenched fields and grasslands. Viola sagittata and Viola pedata.
Regals have lived in Grassland habitats in the East for thousands of years. In the closing decades of the 20th Century, they disappeared from their East Coast habitat except in Pennsylvania. 17,000 acres of suitable habitat there sustain the last remaining population on the East Coast.