REPRODUCTION OF WESTERN YELLOW PINE. 



109 



Although the stand of 1919 seedlings was scarcely more than one- 

 tenth as dense as that on similar cuttings in the other groups, the 

 present ratio between brush-covered and open areas is practically 

 the same in all cases. Group 9 has produced especially convincing 







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data in regard to the influence of herbaceous vegetation in determin- 

 ing whether brush is beneficial or detrimental to reproduction. 

 Wherever bunch grass is present, even in a thin stand, pine seed- 

 lings are invariably less numerous and of smaller size in the brush 

 than where there is no brush. But where the bunch grasses or 



