THE ANGIOSPERMAE 



120' 



remain incompletely developed, so that the inturned edges of each carpel 

 do not meet each other and the locuh are incompletely separated. Fmally, 

 the carpel margins may not be inturned at all, but united to form a rmg- 

 like xvall around a single internal cavity. The last two cases are classed as 

 unilocular. 



Fig 1177.— Various tvpes of placentation as seen in transverse 

 sections of ovaries. A, .^xile with two carpels. B Axile 

 with three carpels. C, Axile with five carpels. 1 he pla- 

 centae in each case represent the inturned margins ot the 

 fused carpels. D, Parietal. E, Marginal. F, free central. 

 {After Goebel.) 



In plurilocular ovaries the inner margins of the united carpels are 

 generallv more or less wholly fused at the centre of the compound structure 

 and there they form a solid column of tissues, commonly called the axis ot 

 the ovary. This is not, however, an upward continuation of the axis of the 

 flower which does not, as a rule, extend beyond the base of the gynoecium. 

 The tissue of the ovarv axis belongs to the carpels, with at most some 

 residual tissue of the floral axis enclosed, and the vascular bundles it con- 



