Appearance
Males have pale silvery-blue wings with black and white border . Females are dark brown, also with the black and white borders. As with many blue butterflies, separation from similar species in the field is on the underside markings.
Naming
*''P. c. borussia'' Ural⤷ ''P. c. asturiensis'' Sagarra, 1922 Pajares, Cantabrian
Behavior
''Note that information on this species applies to Great Britain and some details may not be consistent with the species in other parts of its range.''In the UK, this is a species favouring unimproved chalk downland. Its larval foodplant is horseshoe vetch . It is usually seen on the wing for about 6–8 weeks, July to September.
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