Description
The Gray Copper (Tharsalea dione) is the largest copper butterfly in Minnesota with grayish-brown wings adorned with orange and black markings on the upper side and lighter undersides with black spots, typically found in open areas.
Range
Generally the southern and western parts of the state, but I did see one near Duluth, so probably anywhere with docks (rumex spp) the larval host plant. Look for it in prairie restorations, old fields, and open natural areas.
Similar Species
None. It’s large size and lack of strong orange markings differentiates this species from all other coppers.
Host Plants
Curly Dock (Rumex crispus), Water Dock (Rumex orbiculatus), Other Dock species (Rumex spp.)
Flight
July