CHAPTER III 



DISPERSAL OF WEED SEEDS 



Scattering of Plants. After the seed is formed it must 

 be placed in a congenial soil so that its kind may be per- 

 petuated. This scattering of seeds and fruits is therefore 

 important. The following are the different ways by 

 which plants are scattered : 



I. WIND. 



A. Tumble weeds, Russian Thistle. 



B. Winged fruit appendages, Maple. 



C. Winged seed appendages, Milkweed. 



D. Parts of inflorescence with modified expanded bracts, etc., 



Basswood. 



E. Parts of the seed or fruit inflated, Balloon Vine. 



Fig. 5. Scattering of red cedar by birds. (U. S. Dept. Agrl.) 



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