The Distribution of Certain Members of the British Flora

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Abstract
Of 16 species found only in Ireland, 9 belong to a south-European stock and are the most outlying members of the southern element in the British flora. Sixty-eight species occurring in England and Ireland, but not in Scotland, are generally distributed in France and southwest Europe and exhibit a southern and western range in England although more unevenly distributed in Ireland. A detailed analysis of these Anglo-Irish species reveals a close phytogeographical connection between southeast Ireland and southwest England. The immigration from the Continent of the non-boreal flora of Britain after the Great Ice Age may possibly be traced along several migration routes. The invasions reaching southwest England and Ireland are regarded as the beginning of the process although they merge into the later and more important migrations from the southeast.

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