Praeger — On Tijpes of Distribution in the Irish Flora. 53 



Another type of absence appears in fig. 53 {(Enanthe Phellan&rium), 

 consisting of a dying out along the mountain-rim of Ireland, especially 

 in the west. Seven species — 



Nasturtium palustre. 



amphibium. 

 Slum angustifolium. 

 (Enanthe Phellandrium. 



liumex Hydrolapathum. 

 Elodea canadensis. 

 Lemna trisulca. 



— exhibit this feature conspicuously, and others to a less degree ; all 

 are practically universal elsewhere. This is quite a homogeneous 

 group, inhabitants of lowland marshes and ditches, with a strong 

 " English " tendency in Great Britain. 



A third group is illustrated in fig. 54 ( Vicia angustifolia), with 

 which may be classed 



Sisymbrium Alliaria. 

 Ulex Gallii. 



Valerianella olitoria. 



Here the character is a marked absence from the province of Connaught 

 — the middle part of the Connacian district. These plants have little 

 in common, Sisymhrium being calcicole, Vlex calcifuge, the others 

 neutral ; and they show similar diversity in other respects, the only 

 point of agreement being a preference for dry situations. 



Fig. 54. — Vici'a angusiifolia. 



Fig. 55. — Leontodon hirtus. 



1 By "universal" I mean present in all divisions. 



