38 



BULLETIISr 791, U. S. DEPAETMENT OF AGRICULTURE, 



Next to tongue-leaved violet, evening primrose is tlie most ag- 

 gressive and abundant. This species is followed in aggressiveness by 



Mexican dock, the increase in which is held in check to an appreci- 

 able extent, however, by the fact that it is relished more by stock 



