50 



ELEMENTS OF STRUCTURAL liOTANY. 



The ovary (Fig. 76) is six- 

 angled, and on being cut 

 across is seen to be three- 

 celled. 



65. Comparing this flower 

 with that of Dog's-tooth Vio- 

 let, we find the two to exhi- 

 bit a striking resemblance in 

 structure. But in one respect 

 the plants are strikingly un- 

 like : the leaves of the Trillium 

 are net-reined (Fig. 77), as in 

 the Exogens. From this cir- 

 cumstance we learn that we 

 cannot altogether rely on the 

 veining of the leaves as a con- 

 stant characteristic of plants 

 whose parts are not in fives. 



Fig 77. 



Fig 76. 



Fig. 75. 



TRILLIUM. 



