230 



FAMILIES OF FLOWERING PLANTS 





Ei^;-' 



;^\ 



Fig. 207. Another view of the bladderwort [Utricularia) showing the air bladders 

 by which the plant is floated. After Kerner, from Coulter's ' ' Plant Re- 

 lations," by courtesy of D. Appleton & Co. 



the south, and the species are found in extreme arctic regions as well ; 

 they are called butterworts, from the slippery surface of the leaves, 

 which are borne in a basal tuft or rosette. 



