The Limestone Pavements organisation describes the local area and their leaflet on Whitbarrrow Scar and its flora and fauna can be downloaded from this link. This outlines some of the many rare butterflies in the area.
Cumbria Wildlife Trust looks after several Nature Reserves in the area - one of which on Whitbarrow Scar is outlined in this brochure.
And for a general look at the area see Wikipedia entry on Whitbarrow
