Caltka palustris : a, flower 

 d, fruit ; c, single follicle 

 p. 20. 



Pamassia i>ahistris. p. 65. 



A, Hippuris vulgaris 

 with verticillate 

 inflorescence ; B, 

 separate flower con- 

 sisting of a pistil 

 with a long wart- 

 like stigma and 

 a single stamen 

 (magnified), p. 60. 



[Opposite p. 65. 



