164 



LAKE SUPERIOR. 



Lake Superior. 



Betula papyracea Ait. 

 " excelsa Ait. 



" puraila L. 

 Alnus incana Willd. 



" virldls DC. 



Europe. 



BETULACEjE. 



Betula pubescens Pall. High Jura. 

 " nana L. Peat bogs of the high 

 Jura. 



Alnus glutinosa L. Valleys of the 

 Jura. 

 " viridis DC. The Handeck, in 

 the Bernese Alps. 



SALICINEjE. 



Salix pedicellaris Pursh and others. For the willows and poplars, which 



are rather extensively distributed 

 aquatic plants, see the second list. 



About Lake Superior the Amentacete are represented only by species of 

 cold countries, or subalpine regions, and are, with a few exceptions, the same 

 as those of Europe. The Quercus rubra is scarcely an exception, since the 

 Quercus pedunculata ascends the valleys of the high Jura ; we find very large 

 trunks of it in the marshes of the Verrieres, on the frontier of France and 

 Switzerland. 



ULMA CEJE. 



Ulmus fulva L. Ulmus efFusa Willd. Banks of the 



" americana L. Doubs. 



Humulus Lupulus L. 

 Urtica canadensis L. 



Pinus Strobus. L. 

 " resinosa L. 

 " Banksiana Lamb. 



URTICACEjE. 



Humulus Lupulus L. Hedges of Val 

 de Travers. 



Urtica dioica L. Everywhere. 

 These two species spread diversely 

 in various regions, and have no- 

 thing characteristic. 



CONIFERJE. 



Pinus sylvestris L. Declivities of the 



Jura. 

 " Pumllio Clus. Peat bogs of the 



higher Jura. 

 " Cembra L. Declivities of the 



Alps. Handeck. Glacier of 



the Aar. 



