STRUCTURE OF THE FLOWER AND ITS ORGANS. 149 



all inserted on the receptacle, and the corolla and stamens 

 are said to be hypocji/nonn, that is, beneath-the-pistil. In II 

 the petals and the stamens appear as if they had grown fast 

 to the calyx for some distance, so that they surround the 

 pistil, and they ai-e therefore said to be jjerujynous, that is, 

 around-the-pistil. In III all the parts are free or uncon- 



FiQ. 130. — Diadelphous 

 Stamens of Sweet Pea. 



Fig. 129.— Slona- 

 delphOTis Stamens 

 of Mallow. 



A 

 Fig. 132, 



B" ' C 



Principal I'ypes of Placenta. 

 A, parietal placenta ; B, central placenta ; 

 C, free central placenta ; A and B, trans- 

 verse sections ; C, longitudinal section. 



M 



Fig. 131. — Stamens of 

 a Thistle, with An- 

 thers United into a 

 King. 



a, united anthers ; /, 

 filaments, bearded 

 on the sides. 



solidated, except the petals and stamens; the stamens may 

 be described as ejnpefalous, that is, growing-on-the-petals. 

 Sometimes some or all of the other parts seem to grow out of 

 the ovary, and such parts are said to be epifjijnous, that is, 

 on-the-ovary, like the petals and stamens of the white water- 

 lily, Fig. 134. 



186. Floral Diagrams. — Sections (real or imaginary) 



