130 



FLOWER OF THE HIGHER SEED PLANTS 



pistil. Placentas on the wall of the ovary, like those in Fig. 13 5, 

 A, are called parietal placentas ; those which occur as at B 



are said to be axial; and those 

 which, like the form repre- 

 sented in C, consist of a col- 

 umn rising from the bottom of 

 the ovary are called free cen- 

 tral placentas. 

 157. Superior, half -inferior, 



anfl 



FIG. 136. Insertion of the floral organs 



A, hypogynous, all the other parts on the as in the diagrammatic flower 



receptacle, beneath the pistil ; P>, perig- . & 



ynous, petals and stamens apparently of Fig. 122, the receptacle IS 



growing out of the calyx, around the rounded or club-shaped, and 

 pistil ; C, cpigynous, all the other parts 



appearing to grow out of the pistil. the floral organs arise from it 



After Strasburger 



in successive gets> 



flower 



is said to be liypogynous (from two Greek words here applied 

 to mean under the pistil), and the ovaries are said to be 

 superior (Fig. 136, A). 



When the receptacle is concave, or when it grows up about 

 the pistil, carrying the other floral parts with it, so that 

 the pistil is inserted on the same 

 level with the stamens or lower, 

 but not at all united with the re- 

 ceptacle, the flower is said to be 

 perigynous (meaning around the 

 pistil) and the ovary is half infe- 

 rior (Fig. 136, B). 



When the ovary is united with 



the receptacle the flower is said 



v . . 



to be epigynous (meaning upon 



FIG. 137. White water lily 



,i .,.-,. ,, . The inner petals and the stamens 



the pistil), Or the OVary IS infe- growing from the ovary. - After 

 rior (Fig. 136, C}. Decaisne 



158. Floral diagrams. Sections (real or imaginary) through 

 the flower lengthwise, like those of Fig. 136, help greatly in 

 giving an accurate idea of the relative position of the floral 



