AdultFor the Immaculate Green Hairstreak, the undersides of the wings have an apple-green ground colour. The ventral hindwing has a median row of white spots arranged in a curved line. Often the white spots are weak or partially to almost completely lacking. The ground colour of the upperside of the female wing is tawny; that of the male is grey brown.
SubspeciesBC populations are C.a. washingtonia Clench, 1944 (TL: Alta Lake, Okanogan Co., WA). This subspecies ranges south to eastern WA and northeastern OR.