| Home | E-mail | Cactuspedia | Mail Sale Catalogue | Links | Information | Search  |

 
 
 
Section  [ Taxonomy ]

Dictionary of botanic terminology - index of names

     
  In taxonomy a section  is  a rank between  genus and species. A subdivision of a genus into morphologically recognisable groupings of related species, but of a category below than subgenus and higher than series.  

The species grouped in a section have minor repeating, genetic and structural distinctions (morphological characters such as size or shape of parts, and either partially or completely isolated, usually by means of geographical or ecological barriers)

Section  [ Morphology ]
Synonym: Segment, Article, Joint.
     
  One of several part or segment of a stem composed of a series of units.  
     
See: Segment  
Section  [ Geometry ]
Synonym:
     
     

 

 


Advertising



 

 

1


 
 
 
Holdfast roots  [ Botany  ]

Dictionary of botanic terminology - index of names

 
     
  Some species of climbing plants develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place.  
     
Climbing plants, like the poison ivy (Toxicodendron radicans), Boston ivy (Parthenocissus tricuspidata), and trumpet creeper (Campsis radicans),  develop holdfast roots which help to support the vines on trees, walls, and rocks. By forcing their way into minute pores and crevices, they hold the plant firmly in place. Usually the Holdfast roots die at the end of the first season, but in some species they are perennial. In the tropics some of the large climbing plants have hold-fast roots by which they attach themselves, and long, cord-like roots that extend downward through the air and may lengthen and branch for several years until they strike the soil and become absorbent roots.

Major references and further lectures:
1) E. N. Transeau “General Botany” Discovery Publishing House, 1994
     

 

 

 

| Home | E-mail | Cactuspedia | Mail Sale Catalogue | Links | Information | Search  |