488 Canadian Record of Science 



hold of the soil if one could only come across them. 

 July-October. 



Galinsoga parviflora Cav. — This Mexican plant was 

 first reported in Canada by the writer, in 1893, a small 

 colony of it being observed in September of that year, on 

 McGill College Campus. Now it is in full possession of 

 every uncared for space in front of people's houses, and 

 can be counted by hundreds of thousands. August- 

 October. 



Artemisia biennis Willd. — This westerner has also 

 found evidently a congenial home in Montreal, for it, too, 

 numbers hundreds of thousands of specimens everywhere 

 in waste ground about our streets and lanes, although it 

 was rarely seen thirty years ago. August-October. 



Ambrosia psilostachya D. C. — The railways are to be 

 credited also with introducing this "ragweed." It is 

 making its way rapidly near railway stations. August- 

 October. 



Echinops sphozrocephalus L. — A colony of this plant 

 has maintained itself for several years alongside the 

 street railway track, near the junction of Westmount 

 Boulevard with Cote des Neiges Road, and seems likely 

 to extend itself, so large are its heads of achenes. July- 

 September. 



Cirsium horrididum Michaux. — This yellow thistle is 

 not found in any portion of Eastern Canada besides the 

 Island of Montreal and the district lying immediately 

 around. Thirty years ago it was to be met with occa- 

 sionally on the roads leading to St. Michael, and else- 

 where, between the city and Riviere des Prairies ; but to- 

 day thousands of specimens may be seen wherever there 

 are quarries, and it has made its way across the two 

 rivers to Rosemere. August-October. 



Cirsium Arvense (Scop.) setosum. — A small colony 

 of this plant has been in existence for some years among 



