384 THE CANADIAN NATURALIST. [DeC. 



this spreading habit will not only be the most likely to migrate 

 to and become naturalized in foreign lands, but of all species 

 which may happen to be so naturalized from here will be the 

 most hardy, and probably have, eventually, the widest range. 

 JEJrigeron Canadense and E. annuum are familiar illustrations. 

 With an extensive range in this couniry, they have migrated to 

 Europe, where, in the naturalized state, they now have a wide 

 distribution. (Enothera biennis aifords an example of the same 

 feature. 



Illustrative of this last group there are some well-known plants. 

 Rdnunculus alorfivus,h., is very common on roadsides in different 

 parts of the country. The range of the plant is from the Detroit 

 River to the Lower St. Lawrence and Newfoundland. The variety 

 micranthus occurs on the north shore of Lake Superior, and thence 

 westward and south-westward. 



Corijdalis aurea, Willd. At Ottawa, I found this plant among 

 the rocky debris on the banks of the river, along with introduced 

 plants. Dr. Bell has observed a similar spreading tendency on 

 the Manitoulin Islands. This habit is, as yet, but little developed, 

 as elsewhere the species is only known in its normal state. It is 

 well distributed over the two Provinces, except in the Erie 

 district. 



Oxalis sfricta, L. At Kingston, this is common in gardens. 

 Excepting on the north shore of Lake Superior, it is well diffused 

 over Ontario and Quebec. 



(Enothera biennis, L., is now a garden plant. It is sometimes 

 found growing in rubbish and on road-sides. The distribution of 

 the plant over the two Provinces is very general. 



Sambucus Canadensis, L. This is exceedingly common in 

 fence lows. It is a well-known species from the southern shores of 

 the Georgian Bay and from the Detroit River to the Lower St. 

 Lawrence. Its abnormal habits have been observed in the United 

 States, and the question has been raised whether it is a native 

 there or not. 



Erigeron Canadensis, L., is a plant of wide distribution, both 

 on this and other continents. Here it ranges over the greater 

 portion of the two Provinces, and often occurs in neglected fields. 

 Two other species of this genus E. annuihm, Pers. and E. strigosum, 

 Muhl. have also a tendency to become intruders. 



Rudbeckia hirta, L., is a southern plant, indigenous in the 

 Ontario peninsula, and eastwards as far as Belleville, but also 



