/ 
556 Proceedings of the Royal Irish Academy, 
AVith tliese also ougTit perhaps to be included some species of an 
aberrant distribution. Tliese are sea-loving plants which find 
suitable conditions of atmospheric moisture repeated on the 
mountain top; Armeria maritima^ Sedum anglicum, Cochlear ia 
officinalis, and Silene maritima. In some cases, as on Slievemore in 
Achill (2200), Armeria maritima is continuous from the summit to 
the sea- washed base. 
Amongst {c), plants with limits in both directions, the majority 
of Alpines occur. The following is a complete list of the so-called 
Alpine plants in Ireland. 
Thalictrum alpinum, 
Arctostaphyllos uva-ursi. 
Drala incana, 
Vaccinium vitis-idaa, 
Arahis petrcea, 
Polygonum viviparum, 
Silene acaulis. 
Oxyria reniformis, 
Dryas octopetala, 
Salix herhacea, 
JEpilolium alsinifolium, 
Juniperus nana, 
Ruhus chamcemorus, 
Carex rigida, 
Alchemilla alpina, 
Sesleria cmrulea, 
Sedum rhodiola, 
Poa alpina, 
Saxifraga stellaris, 
Cryptogramme crispa, 
S. nivalis, 
Polystichum lonchitis, 
S. aizoidesy 
Asplenium viride, 
S. oppositifolia, 
Lycopodium alpinum, 
Galium horeale. 
L. selaginoides, 
Saussurea alpina, 
Isoetes lacustris. 
ECieracium anglicum. 
All of these have lower limits in some parts of Ireland at any 
rate. A few may be said to have no upper limit perhaps, and these 
are the only plants falling under {h), which is a needless division ; 
they are Saxifraga stellaris, Salix herhacea, and Carex rigida. The 
remaining alpine species belong to (c), for although some may have 
no downward limit in some parts of Ireland, they are none the less 
bound by altitude and latitude combined. A plant which reaches sea 
level in Donegal (e. g. Praia incana) and does not descend to within 
2000 feet of the sea in Kerry, has of course a lower limit within the 
Irish mountains. 
Of the Alpine plants in Ireland the following alone never pass 
