Phaeger — On Types of Distribution in the IriaJt, Flora. 9 



Co. DowB, on the west coast they maintain their sway as far south as 

 Clare, or even North Kerry. Inland everywhere they are few in 

 number, "Westmeath alone falling barely within the third gi-ade. The 

 latter fact cannot be accounted for by the absence of saline conditions 

 in central Ii'eland, as out of the 50 species only foui' — Ligusticum, 

 Mertensia, Scirpus rufus, and Elymus — are maritime plants. Nor is 

 it due to an avoiding of the Central Plain on account of its limestone 

 expanses, for the limestones of Sligo, Leitrim, and Clare yield them 

 in abundance, and they attain their minimum in the south-east and 

 south, where limestone is only very locally developed. Neither does 

 the distribution of hilly ground satisfactorily account for their range, 

 which is apparently due to climatic conditions as yet imperfectly 

 imderstood. 



4. Highland Type : " Species chiefly seen about the mountains." 

 — As H. C. Watson points out, the more characteristic members of this 

 group might be better called Arctic Type, as they consist of high 

 northern species, brought into our latitudes by the elevation of the 

 land into mountains. This group occupies the northern end of the 

 series of four latitudinal types — English, Intermediate (a small and 

 indefinite group), Scottish, Highland. Its headquai'ters are on the 

 high Scotch mountains and in the extreme north of that country. 

 The list of Highland type plants in Ireland is as follows : — 



Thalictrum alpinum. Hieracium strictum. 

 Subularia aquatica. gothicum. 



Draba incana. corymbosura. 



Arabis petxaea. Arctostaphylos Uva-ursi. 



Silene acaulis. Vaccinium Vitis-Idsea. 



Dryas octopetala. Polygonum viviparum. 



Rubus Chamcemorus. Oxyria digyna. 



Alchemilla alpiria. Salix herbacea. 



Epilobium alsinefolium. Juniperus nana. 



Sedum Ebodiola. Carex pauciflora. 

 Saxifraga stellaris. rigida. 



nivalis. aquatilis. 



aizoides. Aira alpina. 



oppositifolia. Sesleria cterulea. 



Galium boreale. Pea alpina. 



Saussurea alpina. Cryptogramme crispa. 



Hieracium senescens. Aspidium Lonchitis. 



anglicum. Asplenium viride. 



iricum. Lycopodium alpinum. 



prenantboides. Selaginella selaginoides. 



croc;itum. Isoetes laoustris. 



