Interesting but we also have a group of wild-flowers native to Ireland but mainly absent from Britain form what is known as the Lusitanian Flora.
This unique collection of Mediterranean plants came originally from the Iberian Peninsula (North Spain and Portugal), and in Ireland most are found in the South and West. Now it is assumed that they did not survive the last ice age so how did they get here if there was a land-bridge to the north it is possible there was one to the south as well.