CRUCIFER^:. 



123 



FIG 78. Vertical section of a flower of Wallflower. 



dynamous character, which is usually explained by sup- 

 posing either the constant suppression of 2 short stamens 



FIG. 79. Stamens (tetra- 

 dynamous) and pistil of 

 the Wallflower. 



FIG. So. Single stamen 

 of same. 



FIG. 81. Capsule 

 (siliqua) of Wall- 

 flower, showing 

 one of the valves 

 dehiscing from 

 below upwards. 



of an outer whorl of 4, or, with greater probability, the 

 collateral fission of the 2 stamens of the inner whorl, the 

 flowers being essentially dimerous. 



