290 THE FRUIT. 



dorsal suture, as in Iris, Hibiscus, CEnothera, &c. In this, the 

 dissepiments remain intact. If they break away from the centre 

 then they are borne on the middle of the valves, as in the figures 

 above cited. If they remain coherent in the axis but break away 

 from the valves, the result is one form of what is called - 



550. Septff nii/nl dehiseence, i. e., a breaking away of tin- 

 valves from the septa or partitions, as shown in Fig. GIG. This 

 represents the loculicidal form of the sept i frugal mode, which is 

 less common than that of the accompanying diagram, Fig. G17. 



Here the partitions alternate 



f X,, /^~ s. with the valves: that is. the 



dehiseence of the pericarp is 



I \ i \ v ^^ x ^^ i of the septicidal order, as 



I .^''^ \^ \ I ) near as may be. but the par- 



\ / \ J titions do not split, wherefore 



Vs, ^S N^ ^/ the valves break away at the 



(!1G 617 common junction. To this 



the term marginicidal has been applied. It occurs in the 2-3- 



carpellary capsule of Ipomoea (especially in the common Morning 



Gloiy), in the 5-carpellary capsule of the North American species 



of Bergia ; likewise in the 2-carpellary pod of Crucifene (Fig. 



623), with a difference that the placenta- from which the valves 



break away are here parietal and the partition is abnormal. 



551. The terms septieidal and loculicidal apply equally in plan, 

 though not with etymological correctness, to one-celled capsules 

 with either parietal (-195) or free central (599) placentae. AYhcn 

 the dehiseence is of the septicidal type and the placcntation pari- 

 etal, the (half) placentae are borne on the margin of the valves, 

 as in the Gentian family and the species of Ilypericum with one- 

 celled capsule. When the placenta- are borne on the middle 

 of the valves, as in Violets, the dehiseence is of the loculicidal 

 type. In the case of free central placentae with no trace of 

 partitions, the character of the deliisceiice may usually be deter- 

 mined by the position of the styles or stigmas relative to the 

 valves. 



.").") 2. Dehiseence may be quite normal although very partial, 

 as when confined to the apex of the capsule of Cerastium and 

 of rrimula, and even to the pores under the radiate stigmas 

 of Poppy. 



.">:>:',. /my//w or <ilmnrmal dehiseence is such as has no respect 

 to the normal sutures; as where the dehiseence is transverse; 



PIG. 616. Diagram of loculicidally septifragal dehiscence. 617. Same of septicidally 

 or rather marginicidully scptifragal dehiscence. 



