4 DESCENDING PART OF A PLANT. ROOT. 



r. R. articulata or granulata, & Jointed or Gra- 

 nulated Root, like Wood Sorrel, and White 

 Saxifrage. 



9. 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 always perennial, as are some 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 sponta- 

 neously, or with the assistance of art. 



11. 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. 



