INTEODUCTION. Lsvii 



Charaoteristic or Ra/re Plants. 



Caltha radieam. Pyrola media. Soirpus aylvatious. 



Cardamine amara. *Veromoa peregrina. Carex elongata. 



Coohlearia anglica. Folygonum mite. C. aquatilis. 



fTeesdalianudicauUs. Mercurialis perennis. C. rhyneophyaa. 



Lathy rus palustris. JStratiotes aloides. Calamagrostis stricta. 

 Buhus chamsemorus. SpiranthesEomanzoffiana. Trichomanes radicana. 



Dryas ootopetala. Typha angustifolia. Cryptogramme orispa. 



Cirosea alpina. Sagittaria sagittif olia. Lycopodium alpinum. 



Cicuta Tirosa. Butomus umbellatus. Pilularia globulifera. 



Vaooinium Oxycooous. Potamogetonjlmtans. 



DISIEICI XI. BONB&AL. 



Donegal, and Berry west of the Foyle. 



Area, 1890 sq. miles. — Flora, 722 species and sub-species. 



Maritime, with, very broken coasts and deep sea inlets.. The islands 

 of North Aran, Tory, and Inishtrahul belong to this district. The 

 whole surface is mountainous or hilly, with numerous lakes and 

 streams, the Pinn, a branch of the Foyle, being the only river of 

 importance. The chief summits are Errigal, 2466 feet; Slieve 

 Snacht "West, 2240 feet; andMuckish, 2197 feet, towards the north- 

 west; Slieve Snacht, 2019 feet, in the north ; Croaghgorm, 2219 

 feet, and Slieve League, 1972 feet, in the south. This is the most 

 northern of the Irish botanical districts, with a flora in which the 

 Highland type is strongly represented by 30 species, or three-f ouiths 

 of the total for all Ireland. Of these 30 species, no less than 20 are 

 found congregated in the neighboiu'hood of Slieve League within a 

 radius of one mile, and, with one exception, at heights not exceed- 

 ing 1500 feet. Such an association of alpine plants at comparatively 

 low-levels is altogether unexampled elsewhere in Ireland, and sets 

 in a strong light the northern character of the flora of this district. 

 The contrast with the large and lofty mass of the Kerry Eeeks 

 with their alpine flora of 12 species is most striking; and perhaps 

 still more striking is the contrast with the extended and elevated 

 group of the Mourne mountains, which, while they lie but half a 

 degree of latitude southward of Slieve League, yield, as the Eeeks 

 do, only 12 alpine or Highland species. In this district Baxifraga 

 umhrosa and Ev^horlia hiberna reach, in the Inishowen peninsula, 

 their extreme northern limit for Europe. The only peculiar species 

 is H-ollius europtstts. 



