ORGAXS OF EEPRODUCTION. 



30/ 



suture, and then separate from each other in a septicidal 

 manner. 



C. Scptifragal Dehiscence. — In this form of dehiscence the 

 carpels open by tlieir dorsal sutures, and at the same time the 

 dissepiments separate from the walls and remain united to 

 one another and to the axis, which in this case is generallv 

 more or less prolonged {figs. 662 and 663). Here each valve 

 is composed of the two halves of adjoining- carpels. This form 

 of dehiscence may be seen in the Datura {fig. 663, 2), and 

 Cedrela {fig. 662). The placentas bearing the seeds are here 

 attached to the axis between the dissepiments {fig. 662, a). 



Fig. 662. 



Fig. 663. 



Fig.&\2. Capsule of Cedrela angus- 

 tifoUa, showin? septifragal dehis- 

 cence. V, V, V. "Valves, a. Axis bear- 

 ing the dissepiments, c, c, and seeds, 

 g. Fig. Qa.',. Diagram illustrat- 

 ing scptifragal dehiscence. 



In compound fruits Fig. 663, 2. 



with one cell having 

 parietal or free central 

 placentation, we have 

 two forms of dehiscence ; 

 these are analogous to 

 the ordinary septicidal 

 and loculicidal kinds just 

 described. 



Thus in compound 

 fruits Avith parietal pla- 

 centation, the dehiscence 

 may take place: — either 

 through the confluent 

 margins or ventral sutures 

 of the adjoining carpels, 

 so that each placenta is 

 divided into its two 

 lamella, as in the Gen- 

 tian (^fig. 664), in which 

 case the dehiscence is 

 analogous to the sep- ^. „„„ „ „ , „ ^ 



.••-,? r 1 V Fig. 66S, 2. Capsn^e of Datura Stamonhim, 



tlCldal lorm, and each showing septifragal deliiscence. 



X 2 



