Chap. IV. 



LYTHKUM SALICARIA. 



Fig. 10. 



139 



Diagram of the flowers of the three forms ot Zythntm salicaria,m their natural 

 position, with the petals and calyx removed on the near side : enlarged six times 



lie dotted hnes with the arrows show the directions in which pollen must be 

 earned to each stigma to ensure full fertility. 



