VEGETATION OP THE NORTHERN SHORES. 177 



LAKE SUPERIOR. EUROPE. 



Carex crinita Lam. sembling those of North America, 



which are however not identical. 

 " tentaculata MuJd. 

 " hystricina Wttld. 

 " Ocderi ElirTi. 

 " intumescens Rudge. 

 " retorsa Schwr. 



Nitella flexilis Ayardh. Nitella flexilis Agardh. Lake of Gen- 



eva. 



Fontinalis antipyretica. Fontinalis antipyretica. In the brooks 



of the Jura. 



It seems at the first glance to be a contradiction to unite in a separate table 

 the aquatic plants of the lakes, leaving as characteristic of the subalpine region 

 the aquatic plants of the peat-bogs. That is, however, not the case, for the 

 peat-bogs and the plants which form them, (the peat-bogs with Sphagna at 

 least,) never descend below the Pine region, which they follow in its whole ex- 

 tent, whilst lake and marine plants follow the shores in various latitudes. The 

 former being of course under the direct influence of the temperature, the latter, 

 on the contrary, being more dependent upon the moisture of the soil. 



III. American plants of Lake Superior, which have no analogous representa- 

 tives in Central Europe.* 



Sarracenia purpurea L. ~) 



TT , . AT , > iruly American types. 



Hudsoma tomentosa J\utt. ) 



Rubus Nutkanus Moc. There are no Rubus of the type of 



odoratus and nutkanus in Europe. 



Potentilla fruticosa L. Cultivated in the gardens of Europe, 



where it succeeds very well in 

 temperate plains and in the moun- 

 tains. 



Cornus canadensis L, A charming little plant of which we find 



no other analogue in Central Eu- 

 rope than a few Umbelliferae, for 

 their general form, the Buplevrums 

 for instance, which grow in the 

 Sub Alps. But Cornus suecica L. 

 is its strict analogue in Northern 

 Europe. 



* Besides the genera which have no representatives at all in Central Europe, there 

 are several introduced in this list which have only remote analogues, or indeed, real 

 representatives ; but in such countries of the Old World which are far distant from 

 the mountain chains, the vegetation of which has been compared here with that of 

 Lake Superior. 



