Definitive account of the current distribution of British and Irish vascular plants. It provides a distribution map and accompanying text for 2412 plants and ferns in Great Britain and Ireland, presenting an up-to-date summary of the range of British and Irish plant species, and demonstrating the large changes which have taken place in the range and frequency of many species since the Atlas of the British Flora was published in 1962. The accompanying CD-ROM will enable the user to view, print, and manipulate the records of mapped species.