CHANNEL ISLANDS FLORA. 189 



1. Plants which extend all over Europe, exclusive of 



the Arctic Regions 340 



2. Plants vifhioh penetrate into the Arctic Circle 161 



3. Plants of Central and South Europe 102 



4. Plants of North Europe 4 



5. Plants of West and West Central Europe 29 



6. Plants of South and West Europe 59 



Of the three first groups not much need be said. They repre- 

 sent three plant-waves, as it were, which inundated Europe from 

 the south-east after the close of the last Glacial Period, and their 

 northern limit is simply fixed by the varying capacity of the 

 species to withstand a decreasing temperature. They form the 

 bulk of the Channel Islands Flora, and all belong to the main 

 body of the Flora of Europe. 



The fourth group consists of those plants which have their 

 home on the coasts and the moors of North Europe, and whose 

 progress south is limited by the increase of temperature. This 

 group, as was to be expected, is very poorly represented in Jersey, 

 which enjoys a milder climate than its latitude would seem to 

 entitle it to, owing to the benevolent influence of the Atlantic 

 Ocean. The plants which may possibly be considered to belong to 

 it are : Carex pulicaris L., Alsine peploides Wahl., Cochlearia 

 officinalis L., C. danica L. These are to be regarded as related to 

 the Arctic Ciroumpolar Flora. 



The fifth group may conveniently be subdivided into two. 



a. Plants of West Europe proper. — Asplenium marinum L., 

 Dianthus gallicus Pers., Lepidium Smithii Hooker, Rhaphanus 

 maritimus Sm., Sedum anglicum Huds., Ulex Galhi Planch., U. 

 nanus Forst., Trigonella ornithopodioides DC, Euphorbia Port- 

 landica L., Conopodium denudatum Koch., Statice lychnidifolia 

 De Gir., Cirsium anglicum Lobel. 



6. Plants of West and West-Central Europe. — Mibora verna 

 Adans., Soirpus pimgens Vahl., Carex binervis Sm., C. punctata 

 Gaud., ScOla festalis Salisb., CerastiumtetrandrumCurt., Moenchia 

 erecta Ehrh., Corydalis claviculata DC, Diplotaxis muralis DC, 

 Crassula Tillsea, Ulex europeeus L., Hippocrepis oomosa L., 

 Hypericum pulchrum L., H. elodes L., Carum verticiUatum Koch., 

 Scutellaria minor Huds., Anthemis nobilis L. 



The origin of this group of plants is very doubtful. Some of 



