xlvi 



INTEODUCTIOlSr. 



Scottish and Intermediate Type Plants in Ireland — continued. 



Saxifraga hypnoides. 

 Pamassia palustris. 

 Drosera anglica. 

 Callitriche autumnalis. 

 Cirosea alpina. 

 Myrrliis odorata. 

 liigustioum seoticum. 

 Galium sylvestre. 

 Antennaria dioica. 

 Crepia paludosa. 

 Lobelia Dortmanna. 

 Andromeda polifolia. 

 Pyrola rotundifolia. 

 P. media. 

 P. minor. 



Pyrola secunda. 

 Gentiana vema. 

 Mertensia maritima. 

 Melampyrum sylvaticum. 

 Pinguioula vulgaris. 

 Orobanche rubra. 

 Ajuga pyramidalis. 

 Lamium intermedium. 

 Galeopsis versicolor. 

 Empetnim nigrum. 

 Saliz pentandra. 

 S. nigricans. 

 S. pbylicifolia. 

 Listera cordata. 

 Habenaria albida. 



Potamogeton filiformis. 



P. praelongus. 



P. nitens. 



Eriocaulon septangulare. 



Scirpus rufus. 



Carex dioica. 



C. limosa. 



C. filiformis. 



Festuca sylvatica. 



Elymue arenarius. 



Polypodium Piiegopteris. 



P. Dryopteris. 



Eqnisetum prateuse. 



E. hyemale. 



E. variegatum. 



In its Irish distribution, this group shows no decided tendency 

 to a north-ward prevalence. If we take latitude 64J° as marking 

 the southward limit of northern species in Ireland, we find that no 

 lees than 50 out of the 60 Scottish and Intermediate Type plants 

 set out in the above list range southward to or below this limit, 

 while 25 reach to or below latitude 52°. A little more than hall 

 of the total of 60 species in the group is made up of plants which 

 become perceptibly more frequent towards the north of Ireland, 

 though this increase in frequency is in many cases by no means 

 strongly marked. Only 8 of the 60 fail to reach so far south as 

 54^°, and can be regarded as truly boreal in Ireland. These are : — 

 Trollius europceus, Geranium syhatioum, Eosa hilernica, Zigusticum 

 seoticum, Pyrola secunda, Melampyrum sylvaticum, Salix nigricans, 

 and PIquisetum pratense. 



Atlantic Type.—lhe name of this type, selected by "Watson, 

 as were all his other type-names, solely with a view to exhibiting 

 the salient features in the distribution of plants in Great Britaia, 

 is singularly unhappy when used with reference to the Ii-ish flora. 

 One would natui-ally expect to find an Atlantic gi-oup of plants 

 very fully represented in an island possessing, as Ireland does, a 

 long extended line of Atlantic sea-board, and would also expect to 

 find the group absent from, or at least but little developed in. East 

 Ireland. But, as has been shown (p. xlii), only 34 out of a total 

 of 62, or 55 per cent, of the group, occur in Ireland. Of these 34, no 

 less than 26 are found in the east. Still, in Ireland, the group 



