156 



ESSENTIALS OF BOTANY 



I II III 



Fig. 114. Insertion of the 



Floral Organs. 



When the receptacle is concave, so that the pistil is 

 inserted on the same level with the stamens or lower, but 



not at all united with the 

 receptacle, the flower is said 

 to be perigynous (around the 

 pistil) and the ovaiy is half- 

 inferior (Fig. 114, II). When 

 the ovary is united with the 

 receptacle, the flower is said to 

 be epigynous (upon the pistil) or 

 the ovary is inferior (Fig. 99). 



I, hypogynous, all the other parts on ,gg pineal Diflfrrfltnt; 

 the receptacle, beneath the pistil ; ^°"- -fiOrai L>iagrams. 



II, perigynous, petals and stamens Sections (real or imaginary) 



apparently growing out of the ., ^ ±_^ n i ii • 



calyx, around the pistil; III, co- through the flower lengthwise, 



rolla hypogynous, stamens like those of Fig. 114, help 

 epipetalous. ,, . . . 



greatly m giving an accurate 



idea of the relative position of the floral organs. Still 

 more important in this way 

 are cross-sections, which may 

 be recorded in diagrams like 

 those of Fig. 116.^ 



In constructing such dia- 

 grams it will often be neces- 

 sary to suppose some of the 

 parts of the flower to be raised 

 or lowered from their true 

 position, so as to bring them 

 into such relations that all 

 could be cut by a single sec- 

 tion. This would, for instance, be necessary in making 



Fig. 115. White "Water-Lily. 



The inner petals and the stamens 

 growing from the ovary. 



1 For floral diagrams see Lr Maout and Decaisne's TralU General de 

 Botanique or Eichler's BVntliendlagramnie. 



