46 BRITISH EXAMPLES OF THE 



2. Angiospermia is subdivided thus : 



''Calyx four cleft : 

 Ex. Yellow-rattle, (Rhinanthus) and Cow-wheat, 

 (Melampyrum.) 



* Calyx five cleft : 

 Ex. Fox-glove, (Digitalis.) 



''Calyx two-leaved ; 

 Ex. Broom-rape, (Orobanche) 



FIFTEENTH CLASS.— Tetradynamia. 



Stamens 6, four long and two short. Flowers 

 united. Corolla tetrapetallous, cruciform.* Or- 

 ders 2. 



Siliculosa : fruit a short pod or pouch. Siliquosa : 

 fruit a long and narrow pod. 



1 . Siliculosa is subdivided thus : 



" Silicles without valves : 

 Ex. Sea-rocket, (Cacile) and Whart-cress, (Corono- 

 pus.) 



* Natural order Cruciferce. 



