ANGIOSPERMS. 



493 



ovaries (Figs. 355—358). Since the margins of the carpels which meet in the 

 centre become developed into the placentae, the ovules make their appearance in 

 the central angles of the loculi, as is seen in Fig. 357 ; but very commonly the 

 margins of the carpels which turn in as far as the centre then split into two 



Z? 



Fig. jsC.—GynTcceum of Pyro/a umM/a/a ; y^ longitudinal section, J sepals, / petals, j;* filaments, /ovary, « stigma, 

 (/ nectar-glands ; B horizontal section through the ovary, y the wall, // placentre. 



lamellae which are bent back and swell out into placentae in the middle of the 

 loculi, as is shown in Fig. 356. It is clear that in this case the two placentae within 



FIG. riS7.-D^ctam„us Fraxinella; A young flower-bud, with rudiments of sepals s; B older flower-bud, ^^'^ ;;f '■"^"'^J' 

 petals/; ' C still older state, with rudiments of the five stamens a, five more stamens a> arise between them, of which three are 

 already visible ; b the b«act, b' a bracteole ; D-H development of the ovary //6, sk ovules, gp gynophore, g style. 



each loculus correspond to the margins of the same carpel which forms the outer 

 wall of the loculus. 



Spurious dissepiments may arise in polycarpellary as in monocarpellary ovaries; 

 if the polycarpellary ovary consists of two loculi, it may thus become quadrilocular, 

 or five original loculi may become divided into ten. The first case is universal in 



