36 



Proceedings of the Royal Irish Academy. 



Thalictrmn flarum, 



23 



E 



Gentiana AmareUa, 



29 



BE 



Eanimculus circinatus, 



13 



EG 



Teucrium Scordium, 



7 



GE 



Caltha radicans, 



2 



— 



Betula Terrucosa, 



17 



— 



Stellaiia palustris, 



19 



EB 



Orchis Jlorio, 



20 



E 



Miamiius catliarticus, 



19 



E 



Opbrys apifera, 



26 



EG 



Lathyrus palustris, 



11 



E 



muscifera, 



8 



EG 



Poteriutn Sanguisorba, 



21 



E 



Juncus obtusiflorus. 



26 



E 



lEyriopliylluin verticillatum, 



25 



E 



Lemna polyrbiza, 



8 



E 



Sium latifolium, 



14 



EG 



Sagittaria sagittifoL'a, 



21 



E 



Comus sanguinea, 



13 



E 



Potamogeton plantagineus, 



23 



EB 



Galium uliginosum, 



13 



BE 



Carex paradoxa, 



1 



LI 



Erigeron acre, 



17 



E 



Pseudo-cyperus, 



22 



E 



Inula saliciaa, 



2 



absent 



Equisetum variegatum, 



15 



S 



Carlina vulgaris, 



28 



EB 



Chara desmacantha, 



21 







Centaurea Scabiosa, 



21 



BE 



polyacantha. 



22 



— 



Crepis taraxacifoKa, 



18 



G 



denudata, 



1 



— 



Tragopogon pratensis, 



22 



BE 



tomentosa. 



5 



— 



Andromeda Polifolia, 



24 



IS 



TolypeUa glomerata, 



11 



— 



Pyrola rotundifolia. 



1 



SG 



Nitella tenuissima, 



2 



— 



An examination of tMs list shows a characteristic composition. 

 Eleven of the thirty-eight are 

 aquatic ; species nine more are 

 marsh plants. Ten belong to 

 pastures and dry ground ; two 

 are bog plants. Eight are 

 calcicole, and none calcifuge, 

 according to the standard of 

 "Cybele Hibemica." All are 

 lowland ; none are charac- 

 teristic of the uplands or 

 highlands. jS'one are woodland 

 species. If we construct a sta- 

 tistical map according to the plan 

 already used, the distribution 

 of the group comes out clearly 

 (fig. 26).^ Here the minimum 

 is 1 ia South Kerry and "W^est 

 Donegal, the maximum 35 

 (or 92 per cent, of the group) 



Fig. 20.— Distribution of " Central " plants. 



1 It may be pointed out tbat the relative value of the depths of shading is 

 really higher than expressed by the numerical equivalents, since species generaUy 

 thm out towards the limits of their range, and reach their maximum abundance 

 about the centre of their areas of distribution ; whereas on these maps a uniform 

 Taiue is awarded to each plant throughout its whole range. 



