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(1) Juvenile  [ Biology ]
Synonym:
Young, Pre-adult, Youth-form

Dictionary of botanic terminology
index of names

     
  In biology the term juvenile or pre-adult refers or relates to an immature organism that has not reached sexual maturity (not capable of reproduction).  
     
Juvenile characteristic are the one appropriate for young individuals during the stage just before adulthood or displaying or suggesting a lack of maturity.
(1) Juvenile phase [ Botany ]
     
  In the life cycle of a plant the juvenile phase is the time of life characterized by differences in appearance from the adult in which the plant lacks the ability to respond to flower-inducing stimuli.  
     

 


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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
     

 

 

 

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