396 



carpella are beginning to separate : a a, carpella ; b, an ovulum cut 



through ; c 3 placenta. 

 Fig. 3. Pistillum of Coriaria myrtifolia ; consisting of five carpella, each bearing 



a single linear stigma, and collected round a common elevated axis, the base 



of which is seen at a. 

 Fig. 4. Ovarium of Lamium album : a, base of the style ; 6, carpella pressed 



together into a square concave body ; c, fleshy lobed disk. 

 Fig. 5. Pistillum of Pinguicula vulgaris : a, ovarium ; 6, style ; c, stigma, 



consisting of two very unequal lobes. 

 Fig. 6. A vertical section of the same: a, the central free placenta ; &, ovula ; 



c, point where the placenta is connected, before fertilisation, with the 



stigmatic tissue. 

 Fig. 7. A perpendicular section of the pistillum of Vaccinium amoenum ; a, 



inferior ovarium combined with the tube of the calyx ; 6, limb of the calyx; 



c, epigynous disk ; d, placenta ; e, ovula ; /, style ; g, stigma. 

 Fig. 8. A transverse section of the ovarium of Hydrophyllum canadense, showing 



its remarkable placentation ; a, , wall of the ovarium ; 5, left placenta ; 



c, right placenta ; e, one of their points of union, the other is seen on the 



opposite side; d, a fleshy secreting annular disk. In this case, two placentae 



grow up face to face from the base of the ovarium, and gradually unite at 



their edges (e), enclosing the ovula within the cavity they thus form ; this 



is proved by Nemophila, in which the placentation is the same, except that 



the placentae are always distinct from each other ; one of these placentae, 



the ovuliferous face turned towards the eye, is represented at fig. 8. 

 Fig. 9. A perpendicular section of the inferior ovarium of Thamuea uniflora ; 



after A. Brongniart : a, tube of the calyx ; b, wall of the ovarium ; c, 



epigynous disk ; d, ovula collected round a columnar placenta. 

 Fig. 10. Transverse section of the ovarium of Viola tricolor, showing its parietal 



placentation : a, one of the three placentas. 

 Fig. 11. Stigma of the same plant, which is inflated and hollow, with an orifice 



obliquely situated at its apex. 



Fig. 12. Bifid stigma of Chloanthes Stcechadis ; after Ferdinand Bauer. 

 Fig. 13. Hairy apex of the style and stigma, with its indusium, of Brunonia 



australis ; after Ferdinand Bauer : a, stigma ; 6, indusium. 

 Fig. 14. The same, divided perpendicularly ; a, stigma ; 5, indusium. 

 Fig. 15. Stigma of Banksia coccinea, with a part of the style ; after Ferdinand 



Bauer. 

 Fig. 16. The earliest state of the ovula of Cucumis Anguria; this, and the 



succeeding figures, to 25 inclusive, are after Mirbel. 

 Fig. 17. Three of these ovules in a more advanced state. 

 Fig. 18. An ovulum at the period when the apex of the nucleus (a) is just 



appearing through the primine. The foramen has already become oblique 



with respect to the apex of the ovulum. 

 Fig. 19. An ovulum of the same, at the period when the secundme is appearing 



through the foramen : a, nucleus ; 6, border of secundine ; the nucleus is 



now more oblique than before. 

 Fig. 20. An ovulum of the same, at a subsequent period, but still long before 



the expansion of the flower ; the several parts are more developed ; the 



nucleus, which at first was terminal, has now become lateral, and is 



