410 THE CANADIAN NATURALIST. [DeC. 



Siljyhium trifoliatum, and others of similar range in the Northern 

 States, and not yet familiar to us as Canadian plants, are to be 

 looked for here; and possibly some species of a more Southern 

 tyj^e may, like Viola villosa, Polygcda Nuttallii, and Ag-rimonia 

 parvijlora, also be discovered in this district. 



The flora, peculiar as regards other parts of Canada to the 

 neighborhood of Lake Erie, embraces no plant not likewise 

 met with in one or other of the adjacent United States. 

 Many of the species composing it form only the outliers, as it 

 were, of a flora which has its centre in the central States of the 

 Union. Others, again, are rather western in their range. To 

 those of a somewhat southern type already mentioned, may be 

 added Polygala fastigiata, Phaseohis lielvolus, Cornus jiorida^ 

 Lohella j)uherula, L. JVuttall/i, Scutellaria iritegri/olia, and 

 JJrtica pur]}urasceiis. Among western and south-western species, 

 or species not frequently observed in the Eastern States, are Jef- 

 fersonia dij)hf/lla, Baptisia leucantha, Artemisia biennis, Lithos- 

 pennurti canescens, Platanus occidentalism Juglans nigra, and 

 Quercus castanea. Platanus occidentidis is said to be also a 

 native of Lower Canada, and I have seen one or two trees of 

 Quercus castanea in the township of Pittsburg, near Kingston. 

 The Erie district, however, here forms the northern limit of these 

 species, though many of them extend north-westwardly to Wis- 

 consin, and even penetrate the section of country watered by the 

 Saskatchewan. This peculiar north-westward distribution of 

 many American plants is a remarkable feature in the vegetation 

 of both the northern United States and Canada. Humboldt, I 

 believe, ascribes the circumstance to the different directions of the 

 valleys in the Atlantic and Western States. 



Among the species characterising the district along Lake Erie, 



are: 



Liriodendron tulipifera. Gerardia integrifolia. 



Jeffersonia diphylla. Scutellaria integrifolia. 



lodanthus hesperidioides. Onosmodium Carolinianum. 



Viola villosa. Lithospermum canescens. 



Hypericum kalmianum, Hydrophyllum appendiculatum. 



Euonymus atropurpureus. Frasera Carolinensis. 



E. Americanus. Asclepias variegata. 



Polygala Nuttallii. Montelia tamariscina. 



P. fastigiata. Sassafras officinale. 



Lupinus perennis. Benzoin odoriferum,! 



Campanula Americana. Euphorbia corollata. 



