The fritillaries which occur in Norfolk are large, active and intensely orange. Even when seen darting from one patch of flowers to the next, an adult dark green fritillary gives the impression of being bright orange. When settled it may be seen to have an intricate pattern of black checks and squiggles on its upperwing and a black checked border to both wings. The underwings are a dull mossy green with rows of very prominent whitish blotches.
The silver-washed fritillary is a woodland species and is unlikely to be confused. It is larger, lacks prominent black tips to the forewings and has strong streaks of silver through its underwings.