258 



PLANT STRUCTURES 



The only advanced character in the flowers as described 

 above is tlie syncarpous pistil, but in the great allied pepper 

 family {Pipcrarece) of the tropics, with its one thousand 

 species, and most nearly represented in our flora by the 



Fig. 242. Ovule of hornbeam (Carpimis), showing chalazogamy: m, the micropyle; 

 pt, the pollen tube, which may be traced to its entrance into the embryo-sac at its 

 antipodal end, and thence upward through the sac toward the egg.— After Mart 



EWART. 



lizard-tail {Saururus) of the swamps (Fig. 195), the flowers 

 are not merely naked, but also apocarpous, and the whole 

 structure is much like that of the simplest Monocotyle- 



