THE INFLORESCENCE AND FLOWER. j\ 



and 213 it is shown above the ovary, and at the base of 

 the style. 



The little glands upon the receptacle are known as 

 nectaries. They contain sweet fluids, and are found among 

 the stamens (Figs. 214, 215) or at the base of the pistil, 

 forming a part of the disk (Figs. 216, 217, 218). 



Turn to pages 186 to 191, and observe that the orders 

 of flowering plants are divided into the following groups, 

 according to the characters of cohesion and adhesion they 

 exhibit : 



1. Inferior Polypetalous Exogens.* 



2. Discifloral Polypetalous Exogens. 



3. Superior Polypetalous Exogens. 



4. Superior Monopetalous Exogens. 



5. Inferior Monopetalous Exogens with Regular 

 Flowers. 



6. Inferior Monopetalous Exogens with Irregular 

 Flowers. 



7. Apetalous Exogens with Perfect Flowers. 



8. Apetalous Exogens with Imperfect Flowers. 



9. Superior Endogens. f 



10. Inferior Endogens. 



11. Gymnosperms.J 



* Outside-growers. Stems that grow by an annual addition of a 

 ring of wood outside the previous wood, and hence they are called 

 Exogens (from two Greek words signifying outside growers}. All the 

 trees and large shrubs of temperate and cold climates are exogenous in 

 their growth. Multitudes of herbaceous plants are also classed as exo- 

 gens. They may be known by their venation. All plants with net- 

 veined leaves are exogens. The seeds of exogenous plants contain a 

 two-leaved embryo (see Ex. X), and are hence called dicotyledonous 

 plants. 



f Inside-growers. Stems that grow by the addition of new wood 

 directed toward their interior. All plants with parallel-veined leaves 

 are endogens. Their seeds also contain a one-leaved embryo, whence 

 the name monocotyledonous plants. 



\ See page 161. 

 5 



