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Peltate adj.   [ Botany ]
adverb:
Peltately  noun: Peltation
(
Synonyms: Shield-shaped; scutiform)

Dictionary of botanic terminology - index of names

     
  Of a flat circular structure having the stem or support attached near the centre of the lower surface, instead of at the base or margin; said of a leaf or other stalked organ or structures.  
     
On the left: a peltate glandular trichome
     
Peltate leaf   [ Botany ]
     
  A peltate leaf is a rounded leaf having its petiole attached to the lower surface of the lamina in the centre rather than to the margin, they have no sinus reaching into the petiole.  
     
As a nasturtium leaf for example (left)

See also: leaf shape

 

     

 


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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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