With the general warming of the atmosphere and the consequent withdrawal of the ice, flora surviving from tertiary times could not re-establish their range in southern Europe ; the new post-glacial climate was drier than that of the Tertiary.

With the general warming of the atmosphere and the consequent withdrawal of the ice, flora tertiary survivors could not regain their range in southern Europe, as the new post-glacial climate was drier than that of the Tertiary, and to these new environmental requirements, the primitive tropical European flora evolved and gave rise to the present flora of the Mediterranean sclerophyll.

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