350 POPULAR GEOGRAPHY OF PLANTS. 



and Salix kerbacea) ; the last of the two, it will be remem- 

 bered, is one of the few plants to be met with in the Polar 

 Regions; and besides these, two species of Rush (Juncus 

 filiformis and J. triglumis). 



A few plants of the Scandinavian connection are also to 

 be found, we are told, in Ireland; and the same kind of 

 confirmation of the theory is said to be derived both from 

 the presence and the absence of particular species of ani- 

 mals. 



One more group remains to be spoken of, the Germanic 

 (No. V.), the commoner species of which, as was before 

 stated, are to be met with everywhere, such as the Daisy 

 (Bettis perennis), the common Primrose (Primula vulgaris), 

 upright Meadow Crowfoot (Ranunculus acris), the small 

 Celandine (Ficaria ranunculoides) , Hairy Cardamine (Car- 

 damine fiirsuta), and all our most common trees and shrubs. 



But the westerly direction in which the plants of this 

 group are supposed to have migrated is thought to be more 

 clearly indicated by observing the localities of its rarer spe- 

 cies, some having never advanced beyond the eastern coun- 

 ties of England, and others, though stretching over consi- 

 derable tracts of England and Scotland, having never found 

 their way to Ireland. 



