PARTS OP THE LEAF. 19 



The aquatic stem is one which, exists submersed in water. 



The herb is a plant having an herbaceous stem. 



The tree is a plant having a woody stem. 



The independent lierbaceous stem, is one which is herbaceous and can 

 raise itself up without any support. 



The dependent lierbaceous stem is one which is herbaceous and can only 

 raise itself up by means of supports. 



The independent woody stem is one which is woody and can raise itself up 

 without any support. 



The dependent woody stem is one which is woody and can only raise 

 itself up by means of supports. 



The rhizome is a subterranean stem which is long and root-like. 



The bulb is a subterranean stem which is short and surrounded by leaves. 



The tuber is a subterranean stem which is thick and fleshy with very 

 small leaves. 



The main stem is one which is developed as the main axis which is some- 

 times connected and sometimes not connected with the tap-root. 



The lateral stem is one which is developed laterally on the other stem, 

 root, or leaf. 



CHAPTER HI. 



THE LEAF. 



The Leaf is always developed laterally on the stem and 

 is usually of a flattened nature. 



Section 1. PARTS OF THE LEAF. 

 The organically lower end of the leaf where it is attached 

 to the stem is called its Base ; the opposite or organically 

 upper end, its Apex ; and the portion lying between the two 

 extremities, its Body. (See Fig. 16.) 



Base. 



'Parts of the leap 



Body. 

 Apex. 



