Metaphyta L ilium. 



161 



are represented in ground plan. The floral diagram of a lily 

 is represented at fig. 80. There the sepals are shown as 

 forming an outer whorl of three parts, the petals as forming 

 an inner whorl alternating with the parts of the calyx. 

 Within these two whorls we find the nine sporophylla in 

 three whorls, all alternating with each other and with the 

 members of the perianth whorl. Notwithstanding the 

 extreme dissimilarity of structure between the sporophylla 

 and the perianth leaves we have no difficulty in deciding 

 that both belong to the phyllon type, not only from this 



FIG. 81. STAMEV. (Semi- 

 diagrammatic.) 



FIG. 82. POLLEN GRAINS OF 

 Cnpressns sempennrens. 

 (Thome\) 



II 



The anther has been sectionised to 

 show the loculi. 



t, a, entin ; />, intin ; II, forma- 

 tion of the pollen tube, c. 



arrangement, but also from the study of such flowers as those 

 of the water-lily, where we find a gradual transition from 

 the sepals to the petals, and from the petals to the sporo- 

 phylla (fig. 63). 



The sporophylla, as we have already seen, are of two 

 kinds, male and female. The male sporophylla form the 

 two outer whorls of three each, and are known as stamens; 

 the three central female sporophylla are known as carpels. 



M 



