REFERENCE TO 

 THE MEDIUM 



10 MORPHOLOGICAL BOTANY. 



Different kinds of roots in reference to the medium are 

 represented in the following table. 



KINDS OP ROOTS IN ( Parasitic Root. 



/ Terrestrial Root. 

 Independent Root -I Aquatic Root. 

 v Aerial Root. 



2. KINDS OF MOOTS IN REFERENCE TO THE POSITION. 

 The root is developed either in the same straight line 

 with the stem, or laterally on the other root, stem, or leaf. 

 That which is developed in the same straight line with the 

 stem is called the Tap-root, and the other which is developed 

 laterally on the other root, stem, or leaf, is called the 

 Lateral Boot. (See Fig. 5.) 



KINDS OF ROOTS IN REFERENCE f Tap-root. 



TO THE POSITION 1 Lateral Root. 



SUMMARY. 



The root is that part of the axis which never bears leaves. 



The base of the root is its organically lower end. 



The apex of the root is its organically upper end. 



The body of the root is the portion lying between the base and the apex. 



The root is said to be herbaceous when its texture is weak and delicate. 



The root is said to be ivoody when its texture is strong and hard. 



The root is said to be annual when it dies the same year in which it is 

 developed. 



The root is said to be biennial when it dies the second year. 



The root is said to be perennial when it lives for many years. 



The parasitic root is one which penetrates into another plant. 



The independent root is one which exists entirely free from any other 

 plant. 



The terrestrial root is one which buries itself in the soil. 



The aquatic root is one which exists in water. 



The aerial root is one which hangs in the air. 



The tap-root is one which is developed in the same straight line with 

 the stem. 



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

 stem., or leaf. 



