Pistillate Hop Plant 



The hop is unique among plants having large economic 

 importance in that the only part of it that has value is the 

 flower. The bitter principle, called lupulin, developed in the flower, 

 has great value from the standpoint of the brewer; and hop- 

 growing is an important industry wherever beer is manu- 

 factured extensively. It is suggested that selective 

 breeding might improve the quality or en- 

 hance the quantity of the essential lu- 

 pulin borne by the hop flower. 



