190 LAKE SUPERIOR. 



Euphorbia Esula. Cynodon Dactylon. 



Dactylis glomerata. 



Salicinece. Poa pratensis. 



Salix purpurea. " annua. 



" viminalis. Festuca duriuscula. 



" alba. " elatior. 



" fragilis. " pratensis. 



Bromus secalinus. 



LiliacecE. Triticum repens. 



Allium vineale. " caninum. 



Lolium perenne. 



Graminece. Arrhenatheruni elatius. 



Alopecurus pratensis. Holcus lanatus. 



Phleum pratense. Anthoxanthum odoratum. 



Agrostis canina. Panicum Crus-galli. 



" vulgaris. Setaria viridis. 



" alba. 



It is still a question whether all these plants originate from Europe, as many 

 of them occur there in the same circumstances as in this continent, under the 

 immediate influence of agricultural improvements, and might have followed the 

 Caucasian race of men from farther east, in his migrations over the temperate 

 zone of Europe. Various other remarks respecting the vegetation of this con- 

 tinent may be found above, in the course of the Narrative, pp. 10, 13, 19, 89. 

 Many interesting remarks upon the foreign vegetation of this continent may 

 also be gathered in Kami's Travels in North America. Quite a number of 

 European insects have also been introduced into this country with those plants, 

 among which I may mention some showy butterflies, as Vanessa atalanta, Car- 

 dui and Antiopa, which are very erroneously considered by some entomologists 

 as native Americans. 



