SCATTERING OF WEEDS 



635 



Pig. 498A Fig. 49SB Fig. 498C 



Fig. 498. Weeds scattered by animals. A. Buffalo Bur (Solarium rostratum). 

 B. Pitchforks (Bidens frondosa), the downwardly barbed points admirably 

 suited for animal dissemination. C. Carrot (Daucus carota). 

 (Drawings by Ada Hayden.) 



Fig. 499. 



Fig. 499A Fig. 499B Fig. 4990 



Cow with attached Burdock. B. Burdock enlarged. C. 

 f rey ( Cynoglossum ) enlarged. 



Com- 



(A, after Bailey, Macmillan & Co. ; B, after Dewey, U. S. Dept. Agr.) 



