Praeger — On Types of Distribution in the Irish Flora. 57 



Watson.. This Mumonian or Lagenian range of the aliens is of interest, 

 for there can be no doubt that it is the result of conditions of climate and 

 soil. In support of this view, one remarkable instance may be cited. 

 Clover seed, imported from England, is sown widely in Ireland ; 

 official information supplied to me is to the effect that no more clover 

 is sown in the south and east than in other parts of the country. 

 With the clover come the seeds of the parasite Orohanche minor, a 

 plant of English type, not a native of Ireland, and unknown therein 

 until some forty years ago. The plant is now an established and 

 spreading colonist, and its present range coincides in a striking degree 

 with that of the group to which it belongs — the light soil English 



Fig. 5g. — Oroban minor. 



type plants. In the central portions of its range — Wexford particu- 

 larly — it is now abundant and permanent. This further emphasizes 

 the floral peculiarities of the south-eastern portion of Ireland, which 

 have already been demonstrated both from the presence and absence 

 therein of certain groups of species. The great Leinster anticline 

 is an important factor in Irish plant distribution, and a phyto- 

 logical boundary of marked character is formed by the line where its 

 uplands sink into the Central Plain, and by the prolongation of that 

 line northwards and southwards. 



Of the seven Types of Distribution proposed in this paper, five have 

 their analogues in the types which Watson instituted for Great Britain. 

 In both series we have a General type, and a JS'orthern, Southern, 

 Eastern, and Western type. The General, ISTorthern, and Southern 

 types of Great Britain and of Ireland in a wide sense correspond in their 



