Praeger — On Type^ of Distribution in the Irish Flora. 49 



in fig. 50 {Erica mediterranea). The leading members of the Burren 

 group are 



Helianthemum vineale. 

 Astragalus Hypoglottis. 

 Spiraea Filipendula. 

 Potentilla frulicosa. 

 Gentiana verna. 



Limosella aquatica. 

 Ajuga pyramidalis. 

 Epipactis atro-rubens. 

 Habenaria iiitacta. 

 Potamoereton lanceolatus. 



The group reaches its maximum on the bare limestone hills of Eurren, 

 whence it spreads in diminishing numbers over the pavements or 

 " crags " of Galway and Mayo. It is essentially a calcicole group. 



In marked contrast to this stands the adjoining calcifuge Connemara 

 group. In its restricted sense, it numbers but three species — the 

 remarkable "Lusitanian" heaths, Erica mediterranea, E.Macliaii, and 

 Baleocia polifolia ; but a few more widely-ranging species, such as the 

 equally interesting Naias flexilis, may fairly be classed with these. 



The list of the Connacian type is as follows : — 



Thalictnim alpinum, 



collinum, 

 Arabis ciliata , 

 Draba incana, 

 Helianthemum vineale, 



guttatum, 

 Viola stagnina, 

 Arenaria ciliata, 

 Geranium sanguineum, 

 Astragalus Hypoglottis, 

 Spiraea Filipendula, 

 Potentilla fruticosa, 

 Saxifraga nivalis, 



umbrosa, 



Sternbergii, 



grsenlandica, 

 Drosera intermedia, 

 Galium boreale, 



sylvestre, 

 Asperula cynanchica, 

 Hieracium iricum, 

 Erica Mackaii, 



mediterranea, 

 Dabeocia polifolia, 

 Arctostaphylos Uva-ursi, 

 Gentiana verna, 

 Limosella aquatica, 

 Euphrasia Salisburgensis, 

 Bartsia viscosa, 

 Ajuga pyramidalis, 

 Polygonum viviparum, 

 Oxyria digyna, 



5 



H 



20 



— 



5 







8 



H 



2 



lA 



2 



LA 



4 



EG 



1 



absent 



11 



B? 



1 



GB 



2 



EG 



4 



IS 



1 



H 



11 



absent 



4 



absent 



2 



— 



19 



E 



22 



H 



6 



IH 



8 



E 



15 



H 



1 



absent 



2 



absent 



3 



absent 



7 



H 



5 



I 



2 



GE 



6 



absent 



7 



A 



1 



S 



3 



H 



8 



H 



Euphorbia hiberna. 



11 



LA 



amygdaloides, 



3 



E 



Juniperus communis. 



1-Z 



B 



nana 



14 



H 



Taxus baccata. 



17 



E 



Epipactis atro-rubens. 



4 



IP 



Habenaria intacta, 



5 



absent 



Sisyrinchium angustifolium 



, 6 



absent 



Simethis bicolor. 



1 



LA 



Allium Schaenoprasum, 



1 



LI 



Juncus tenuis, 



4 



— 



Potamogeton Kirkii, 



1 



absent 



lanceolatus. 



2 



L 



Naias flexilis, 



3 



— 



Eriocaulon septangulare. 



7 



SA 



Scirpus triqueter. 



2 



G 



Rhynchospora f usca, 



19 



A 



Carex Bcenniughausiana, 



2 



G? 



trinervis, 



1 



— 



Deschampsia alpina. 



3 



H 



discolor, 



1 



— 



Sesleria cserulea, 



13 



HI 



Poa alpina, 



2 



H 



Trichomanes radicans. 



13 



A 



Adiantum Capillus- Veneris, 



6 



A 



Asplenium viride. 



12 



H 



Aspidium Lonchitis, 



6 



H 



Equisetum trachyodon, 



8 



— 



Lycopodium iuuudatum. 



3 



BE 



Isoetes echinospora, 



4 



— 



Nitella Nordstedtiana, 



2 



— 



iitt uigyua, O XL 



E.I. A. PROC, VOL VIII., SEC. B.] 



E 



