124 



Elementary Botany 



placentation it is prolonged into the ovary, bearing the ovules. 

 In other cases, as in the Umbelliferse and Geraniaceae, it is 

 prolonged between the carpels and beyond the ovary, and is 

 known as the carpophore (see page 139). 



In other cases, as in some forms of Lychnis, Pink, and 

 Passion-flower, it is prolonged beyond the calyx, forming a stalk 



for the ovary (fig. 237), and it is 

 known as the gynophore. In 

 many plants it is much swollen, 

 and the ovaries are sunk or em- 

 bedded in it, often giving them a 

 syncarpous appearance when the_y 

 are truly apocarpous. 



We sometimes find between 

 the calyx and pistil a body or 

 bodies which are not universal 

 among flowers, and which cannot 

 be referred to any of the organs 

 above described. To this body the name of disc is applied. 

 In the Mignonette and Orange it forms a fleshy swelling below 

 the pistil ; in umbelliferous plants it surmounts the ovary, ad- 

 hering to the styles. In other cases it is variously developed. 



Cohesion and Adhesion.— When the similar parts of a flower 

 are united together in growth, we speak of it as cohesion ; 



Fig. 237. — Section of Lychnis Flos- 

 Jovis^ with gynophore, g. 



Fig. 238.— Floral diagram 

 of the Rose. 



Fig. 239. — Floral diagram 

 of Potato (Solanaceee). 



Fig. 240. Floral 

 diagram of Sweet- 

 pea. 



when dissimilar parts are united, as adhesion. Thus the forma- 

 tion of a gamosepalous calyx, a gamopetalous corolla, or a 

 monadelphous stamen would be cohesion ; whilst the growth of 



