^62 
Proceedings of the Royal Irish Academy. 
Orohanche hederce : Avidely spread, but not occurring in the north- 
eastern counties. A couple of Donegal stations are the only- 
exceptions to its distribution in the southern half of Ireland. 
The western climate of Ireland is very equable from south 
to north, owing to the influence of the Gulf Stream branches. 
Thus the Killarney fern, Bartsia viscosa, Carum verticillatum^ 
all reappear in Donegal. 
Euphorhia Feplis : south. 
Asparagus officinalis : south-east. 
Juncus acutus : south and south-east. 
Rhyncospora fusca : south and west. 
Carex divisa : east (on the median line). 
C. punctata : south-west. 
Glyccria borreri : east (on the median line). 
We will next consider those Irish species which occur in Great 
Britain in Watson's infer-agrarian and mid-agrarian zones only. We 
may expect to find a larger number of these ; and, theoretically, we 
should find here the bulk of the Irish flora, which does not anywhere 
ascend the mountains as high as from six or seven hundred to a thousand 
feet. We should find all those lowland southern species which do not 
reach the iNTorth of Ireland, and also some species which may be called 
maritime in their distribution, since they find perennial mildness of 
climate close by the sea, or else require the actual influence of a saline 
atmosphere. The Irish species occurring in these two zones only 
•are : — 
Thalictrum flavum : chiefly southern ; very rare in the north of 
Ireland generally, and not occurring in Donegal. 
Ranunculus parviflorus : south (and east? on the median line). 
Papaver hyhridum: south, east, and north-east. A weed of 
cultivation. (?) 
Glaucium luteum : chiefly south ; rare in the north, and not 
occurring in Donegal, though maritime. 
Cramhe maritima : maritime, and found, but very rarely, in the 
north : extinct except in the west. 
Nasturtium sylvestre : south and south-midland. 
N. amphihium : chiefly southern, but occurs in the larger water 
systems throughout, though not in the extreme north. 
Barely reaches Donegal. 
Raphanus mariiimus : maritime, and occurs, but rarely, round 
the coast. 
