4 DESCENDING PART OF A PLANT. ROOT. 



7. R, articulata or granulata, a Jointed or Gra- 

 nulated Root, like Wood Sorrel, and White 

 Saxifrage. 



Q. Roots differ in duration, being either annual, bien- 

 nial, or perennial. Fibrous and Tap Roots are 

 frequently annual ; some Tap Roots are biennial ; 

 Creeping, Abrupt, Tuberous, Bulbous, and Jointed 

 Roots are ahvays perennial, as are so.me Fibrous 

 and a few Tap Roots. 



10. Annual Roots produce the herbage, flowers, and 

 seeds within the compass of one season, after which 

 they entirely die ; Biennial ones produce herbage 

 only the first summer, flowers and seeds the next, 

 after which they also die ; Perennial Roots bear 

 herbage and flowers through several successive years, 

 to an indeterminate extent, and moreover increase, 

 or form offsets, either spontaneously, or with the 

 assistance of art. 



1 1. The Root is the first part produced by the Seed, 

 when beginning to vegetate in the earth. It is na- 

 turally directed downwards, extending itself at the 

 extremity, and forming fresh fibres every year, such 

 (7) being an essential part of every kind of root, the 

 vegetation of which, and of the plant it bears, going 

 on only while the fibres continue to grow, and to 

 imbibe nourishment, 



