EXPLANATIOlSrS OF THE FORMULA. 



The Latin names and order of the plants are taken almost "entirely 

 from Babington's Manual of British Botany/, fifth edition, 1862. 



When different Latin names are used in Hooker and Arnott's 

 British Flora, or in Bentham's HarMooh, these are quoted as 

 synonyms in the first line, under the specific name. 



Plants whose claims to be considered species are doubtful are 

 given as sub-species, in italic type, in the centre of the page. 



The signs prefixed to the specific names are used : — 

 t For plants which appear native, but may possibly have been 



introduced at a remote period. 

 X For plants probably introduced, but where some doubt exists. 

 * For plants certainly introduced (whether designedly or unin- 

 tentionally) by man, but which now maintain and propagate 

 themselves in wild-looking places without human assistance. 

 [ Includes many species, which have either been planted, or are 

 not thoroughly established beyond the influence of man. 



The districts have been already defined in the Introduction, and are 

 also shown on the map. 



The latitude relates to Ireland only, and the range is given as far 

 as it can be expressed in a few words within the space of the Kne. 



The " Types" are throughout borrowed from Watson's Cybele 

 Britannica (vol. iv.) as a means of comparison with Great 

 Britain. " British type" signifying, briefly, general throughout 

 Great Britain. "English type," Southern in Great Britain. 

 " Germanic type" South-eastern in Great Britain. '■'■Atlantic 

 type," Western or South-western in Great Britain. '■'■Scottish " (and 

 '■'■Intermediate"), Northern in Great Britain — ^more abundant in 

 Scotland than in England. '■'■Highland type " includes the mountain 

 species, or Alpine flora. 



The initials are used : — 



C. C. B., for Professor C. C. Babington ; '/. C, for Isaac 

 Carroll, of Cork ; D. M., for David Moore ; and A. G. M., 

 for Alex. G. More, 



