CHAPTER XIII 



FLOWER AND INFLORESCENCES 



Floral Leaves. In addition to the foliage leaves p. 31), 

 stipules (p. 45), and bracts (p. 46), which have already been 

 dealt with, certain modified leaves which go to build up the 

 flowers of a flowering plant, and are called floral leaves, now 



call for considera- 

 tion. The succes- 

 sive whorls or rings 

 of floral leaves are, 

 commencing with 

 the external whorl, 

 as follows. 



i. The Calyx, 

 built up of separate 

 leaves which re- 

 ceive the name of 

 sepals. Each sepal 

 is a modified leaf 

 and is, as a general 

 rule, green. 



2. The Corolla, 

 built up of petals. 

 Each petal is also a 



modified leaf, which may be brightly coloured and of a peculiar 

 shape. 



3. The Andrcecium is built up of stamens which form the 

 male organs of reproduction and produce a substance called 

 pollen. Each stamen is, like a sepal and petal, a modified leaf ; it 



FIG. 163. Diagram of Flower in longitudinal section. 

 Ar, calyx ; c, corolla ; a, androecium ; g, gynoecium. 

 (S.) 



