24 



COROLLA. 



Fig. 19. 



137. The corolla, the inner floral envelope in dichla- 

 mydeous plants, is generally of a delicate texture and 

 highly coloured, and larger than the calyx. 



138. The foliaceous pieces of which a corolla is com- 

 posed, are termed petals. 



139. When these pieces continue distinct from each 



other, the corolla is called 

 polypetalous, as (a), but 

 when they are united, 

 monopetalous, as (i). 

 f The cylindrical part of 

 a monopetalous corolla 

 is called the tube (c), 

 the expanded portion the 

 limb (d). 



140. A monopetalous corolla may be regular or irre- 

 gular. 



141. Regular when its figure is uniform, its divisions 

 equal, and these regularly placed around an imaginary 

 axis, as at fig. 20. 



142. Irregular when the reverse, as at fig. 21. 



Of the monopetalous regular corolla we may 

 have 



The Campanulate (a). 

 Infundibuliform (6). 

 Hypocratyform (fig. 19, b). 

 Rotate, the same as the 



last but the tube very 



short. 

 Ventricose (c). 



144. Of the monopetalous irregular corolla we may 

 Fig. 21. f-Q have 



The Ringent or Labiate (). 



Personate (b}. 



145. In the ringent corolla 

 the irregular lips are wide apart 

 from each other, the upper one 

 being often vaulted, is termed the galea or helmet. 

 In the personate corolla the lips are appressed. 



143. 



