many seeds. Barbed seeds such as Burdock and Blue 

 Burr, attach themselves to animals and are thus dis- 

 tributed in the same way. In undecayed manure many 

 undigested seeds are spread around and many small 

 seeds are dispersed by dirt on the feet of birds. 



The tables on the following pages give the duration 

 of growth, time of ripening, brief note on the flower, 

 and the method of spreading, of each of our common 

 weeds. 



