THE SUBDIVISION OF lEELAND Ixxv 



reaches of the Foyle. The rarest plants form a small and very 

 mixed assemblage : — 



Cardamine amara, 6. Hieracium sparsifolium, 3. 



fTeesdalia nudicaulis, 3. Calamagrostis stricta, 4. 



Rubus CliainEeinorus, 2. Pilularia globulifera, 5. 



37. Armagh. 



North-eastern. Area 512 square miles. Inland, touching tidal 

 waters for a few miles along the Newry Eiver in the SE. A small 

 but interesting county. The south-east is mountainous, with rather 

 isolated hills of granite and other igneous rocks, which culminate in 

 Slieve Gullion (1893 feet). The centre and south-west are undula- 

 ting and well tilled, the drift deposits overlying Silurian grits, and 

 embosoming a number of small lakes. One broad ridge rises to 

 1200 feet, but most of the ground is low. In the north there is 

 Carboniferous limestone, New Eed Sandstone, Tertiary basalts, 

 and stratified clays of the last-named period. These clays border 

 Lough Neagh, and form the southern shore of that great lake. The 

 country here is flat, with extensive peat-bogs and several lakes ; with 

 this exception, the northern portion of the county is very fertile. The 

 largest river is the Bann, which flows across the NE. corner into 

 Lough Neagh. The Blackwater and Ulster Canal run along the 

 north-western edge of the county, and the Newry Canal forms the 

 greater part of the eastern boundary. The most cultivated county in 

 Ireland, over 42 per cent of the surface being under crops. Grass 

 land occupies 45 per cent. The flora of Armagh is well-known, the 

 older records having been supplemented in 1892 by a systematic 

 survey by the present writer. 



Flora 631 species, most of the leading groups being fairly repre- 

 sented ; the Central Plain flora has here almost disappeared, and 

 calcifuge plants characteristic of the north-east are abundant. 

 Potamogeton fluitans is not certainly found elsewhere. Barest 

 species : — 



Fumaria densiflora, 4. Polygonum mile, 4. 



Barbarea intermedia, 5. Spiranthes Romanzoffiana, 3. 



(Elatine Hydropiper, 2.) Potamogeton fluitans, 1. 



Rosa glauca, 4. Calamagrostis stricta, 4. 

 Linaria repens, 5. 



