172 Weeds. 



tinent by certain Aiistrians employed in the 

 construction of the Canadian Pacific rail- 

 way. About the year 1889, it began to 

 arrest the attention of the farmers around 

 Indian Head, Saskatchewan. Since that 

 date it has spread rapidly over a large sec- 

 tion of the Canadian Northwest, and to 

 some extent into the adjoining portions of 

 the United States. 



Tumbling mustard is an annual or winter 

 annual. When it grows amid small grain 

 crops, its branches are not numerous, but 

 they are long and slender. When it has 

 room to grow the branches are quite nu- 

 merous and they bear an enormous nunaber 

 of seed pods. The seeds are small, and of 

 a dark reddish brown color. The plants 

 commonly grow about two feet high but 

 the height varies with the soil and season. 

 The flowers are a pale yellow and the plant 

 bears a close resemblance to common wild 

 mustard. 



Tumbling mustard will grow at all 

 season between the time of the spring and 

 autumn frosts. The seeds usually mature 

 at the same time as those of the small 

 grains or even a little earlier, but under 



