52 



MORPHOLOGICAL BOTANY. 



Corolla- 



Dialypetalous Corolla 1 Ee & ular DUypetaloos Corolla. 

 \ Irregular Dialypetalous Corolla. 



„ . ^ r, ,, f Regular Gamopetalous Corolla. 



Gamopetalous Corolla J ° _ „ 



\ Irregular Gamopetalous Corolla. 



Pig. 60. 



Parts. — A fully developed petal consists of an expanded 

 upper portion corresponding to 

 the lamina of a leaf and a. 

 narrow stalk-like portion which 

 is analogous to the petiole, as 

 in the Nadeshiko and Gampi 

 (Lychnis grandiflora) (Fig. 60). 

 The expanded portion is called 

 the Limb, and the petiolar portion 

 the Claw. In a gamopetalous 

 corolla, the part where the petals 

 are united is also called the Tube, 

 the free border the Limb, and 

 the orifice of the tube the Throat 

 (Fig. 59). 



Pig. 60.— Petal of the Gampi 

 (Lychnis grandiflora). 



THE ANDRCECIUM. 



The Androecium is the outer series of the essential organs 

 situated within the corolla, and it is composed of one or 

 more thread-like organs called Stamens. 



Parts op the Stamen. — A fully organized stamen con- 

 sists of a bag-like portion, which is analogous to the lamina, 

 and a slender stalk, which is the representative of the petiole. 

 The bag-like portion is called the Anther and the stalk the 

 Filament (Fig. 65 and 67). The anther is usually divided 

 into two equal halves which are separated perpendicularly 

 by a central portion corresponding to the midrib. Each 

 half is called an Anther-lobe and it has one or two cavities 

 containing minute granules ; and the central portion is 



