THE STOCK AND CABBAGE FAMILY. 



59 



two carpels has taken place, the best way is to take 

 two pea-pods, split them open, but down the edge only, 

 namely, that which carries the peas ; half the peas will 

 be found clinging to one edge and half to the other 

 edge. Cut a second pod in the same way, and now 

 place them face to face. If the two pairs of edges 

 which now meet be supposed to grow together, we 

 should have an ovary such as that of 

 Crucifers, though wanting the extra 

 groiutli forming the plate, which occurs 

 in all members of this family. 



As this peculiar structure is much 

 better seen when the pistil has ripened 

 into a fruit, we will examine the long 

 pod, now called a Siliqica'^ (Fig. 32), 

 and you will see how two strips from 

 the backs of the two carpels peel off 

 from below upwards. These are called 

 Valves. There then remains a sort of 



, f. 1 . -, Fig. 32.— Wallflower, 



a lono[ narrow iramework carrying^ the sniqua dehiscing from 



, ^ o belo^ff, upwards. 



plate upon which are the seeds. This 

 plate is called the False Dissepimejit, or Division-plate, 

 being the extra growth spoken of above. " True dis- 

 sepiments," or sejJta, of an ovary are formed by the 

 walls of the carpels themselves, as explained under 

 Nymjphcea, or the Water-lily. 



united together. Adhesion applies to the parts of a whorl wheu united 

 to a different whorl. 1 Latin lor a " bean-pod." 



