L 13 1 



II. 



IRI8H TOPOGRAPHICAL BOTANY: SUPPLEMENT, 

 1901-1905. 



By ROBERT LLOYD PRAEGER. 



Read February 12. Ordered for Publication February 14. 

 Published :March 10, 1906. 



Ix the year 1901, the Academy did me the honour of publishing my 

 " Irish Topographical Botany," in which the distribution of 

 Flowering Plants and Higher Cryptogams in Ireland was shown 

 according to forty geographical divisions, consisting of counties or 

 portions of counties. The result of the publication of this work was 

 to give a marked stimulus to the working out of the range of plants 

 in this country ; and our knowledge of botanical geogi'aphy has 

 advanced rapidly during the succeeding years. Each year I have 

 summarized the results of the preceding season's work in Tlie Irish 

 Naturalist. Now that five seasons have elapsed, and a large body 

 of material has accumulated, publication of a summary of the results 

 obtained appears desirable. 



To show the general advance in our knowledge of plant-distribu- 

 tion in Ireland, it may be mentioned at once that the net total 

 number of species and sub-species to be now added to the county 

 lists is 814. Also that, whereas at the end of 1900 the average 

 number of aggregate species recorded from the forty divisions was 628, 

 it has risen at the end of 1905 to 646. The additions now made 

 involve an extension of range for nearly every second plant out of 

 some 700 not set down in 1900 as already known to occur in all 

 forty divisions. This gain of course has not been equally shared by 

 all parts of the country. In one division — namely, East Mayo — no 

 addition to the flora has been recorded ; while at the other end of the 

 line, Limerick heads the list with 104 additional species and sub- 

 species. The areas in which the most marked progress has been 

 made may be briefly mentioned as under : — 



1 and 2. Kerry. A number of valuable additions have resulted 

 from the continuance of Dr. Scully's researches into the flora. 



K. I. A. PKOC, VOL. XXVI., SECT. B.] C 



