18 MORPHOLOGICAL BOTAN5T. 



Different kinds of steins according to the medium are 

 represented in the following table. 



Kinds op stems 

 according to •{ 

 the medium 



/ Independent Herbaceous Stem. 

 , Herbaceous Stem { DependeIlt Herbaceous Stem. 

 / Aerial Stem J Independent Woody Stem. 



* Woody Stem J * ^ _ . „. 



1 Dependent Woody Stem. 



(Rhizome. 

 Bulb. 

 Tuber. 

 Aquatic Stem. 



2. KINDS OF STEMS IN REFERENCE TO THE POSITION. 



The stem is developed either as the main .axis, which is 

 sometimes connected and sometimes not connected with the 

 tap-root, or laterally on the other stem, root, or leaf. That 

 which is developed as the main axis is called the Trunk or 

 Main Stem, and the other, which is developed laterally on 

 the other stem, root, or leaf, is called the Lateral stem or 

 Branch. 



KINDS OP STEM IN REFERENCE J Main Stem. 

 TO THE POSITION t Lateral Stem. 



SUMMARY. 



The stem is that part of the axis which always bears leaves. 



The base of the stem is its organically lower end. 



The apex of the stem is its organically upper end. 



The body of the stem is the portion lying between the base and the 

 apex. 



The node is that portion of the body of the stem where leaves are borne. 



The internode is the interval between two nodes. 



The stem is said to be lierbaceous when its texture is weak and delicate. 



The stem is said to be woody when its texture is strong and hard. 



The stem is said to be annual when it dies the sime year in which it is 

 developed. 



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



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



The aerial stem is one which exists exposed to the air. 



The subterranean stem is one which exists buried in the soil. 



