https://apaturairis.blogspot.com/2009/07/apatura-iris-cretaceus-emperor-also_17.html?showComment=1247843319968
The Purple Empire: Apatura iris 'cretaceus' - Emperor Also A Species Of Downland Crests!
We can now add 'downland crests' as a further habitat association of the Purple One! Following on from sightings over several years, by Bidd...