MORPHOLOGICAL BOTANY. 



Section 3. DURATION OF ROOTS. 



The duration of roots is various in different plants : some 

 die the same year in which they are developed, as in the 

 Asagao (Ipomaa triloba) (Fig. 9) and Kiuri (Cucumis 

 sativus); some die the second year, as in the Daikon 

 (Fig. 6) and Ninjin ; and others live for many years, as in 

 the Mume and Sakura (Fig. 2). Those which die the same 

 year are said to be Annual; those which die the second 

 year Biennial ; and the others which live for many years 

 Perennial. 



Duration of roots- 



Annual. 



Biennial. 



Perennial. 



Section 4. KINDS OF ROOTS. 



The root is various in reference to the medium in which 

 it lives and the position from which it originates ; hence it 

 may he classified in two ways. 



Fig. 7. 



Fig. 7. — Parasitic root of the Yadoriki (Viscum album). (Sachs.) 



