Size: Up to 1.75 inch wingspan
Key ID features: Large and plain. Above, tan-orange with graduated dark border. Male with black stigmata on FW, female with light spot band on FW. HW below plain pale tan.
Similar species: Large size and unmarked pale tan HW below distinct.
Host plant: Primarily American common reed (Phragmites australis ssp. americanus).
Habitat: Stands of reeds along streams, seeps and marshes in alkaline lowlands.
Range: Summer Lake area in Lake County, Imnaha River canyon in Wallowa County.
Season: Early July to early September
Conservation Status: Secure