loo MORPHOLOGY 



between the cells or loculi of such an ovary are 

 known as dissepiments or septa, which, from the 

 very nature of their origin from the union and sub- 

 sequent projection of the two margins of two adjacent 

 carpellary leaves, must be double. Occasionally the 

 number of loculi in an ovary becomes increased by 

 the growth of false dissepiments 

 from the wall of the ovary to the 

 placenta. In Datura, for example, 

 the ovary, which is originally two- 



Fig. 93. — Transverse . 11 



Section of siiicuia Celled With a central placenta, be- 

 r, Repium. comes subsequently four-celled by 



the growth of a dissepiment across 

 each cell. Such dissepiments, from the nature of 

 their origin, cannot be double, but must be single, 

 and are hence known as spurious or false. In Mus- 

 tard (fig. 93) and allied plants the ovary is composed 

 of two carpels, syncarpous, originally one-celled with 

 two parietal placentas, but subsequently becomes two- 

 celled by a false septum thrown across the ovary from 

 one placenta to the other. In these 

 plants the false septum has got the 

 special name of replum — r. In 

 Pink and allied plants the ovary is 

 Fig:. 94. — Tr.-insverse syucarpous, onc-celled, with a cen- 

 Free°c:„lTp°r„Ltn tral axis which is free from the wall 

 of the ovary, and on which the 

 ovules are inserted. Such a kind of placentation is 

 known as free-central (fig. 94), and is supposed 

 to arise from the early dissolution of the dissepiments, 

 so that the originally many-celled ovary with axile 

 placentation is rendered one-celled with free-central 

 placentation. In patari {^Polygonum) or pani-marich, 

 {Rumex), where the ovary is one-celled, with one or 

 more ovules arising from the base of the ovary, it is 



