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Leaf margin  [ Botany ]
Synonym: Leaf edge or border

Dictionary of botanic terminology - index of names

     
  The leaf margin is the boundary area extending along the edge of the leaf. There are lots of different types of leaf margins that are important for plant identification  
     

The basic types of margins are:

Entire:
 
having a smooth edge with neither teeth nor lobes.


Toothed :  having a saw like margin with small tooth that can vary in size (from very small to medium), in sharpness (from needle-like to soft) and in shape (from rounded to points).



Lobed:
having some type of indentation toward the midrib that can vary in profundity and shape
(rounded or pointed) and the incisions (sinus) go less than halfway to the midrib.


Parted (or cleft)
:  having some type of indentation toward the midrib that can vary in profundity and shape
(rounded or pointed) and the incisions (sinus) go more than halfway to the midrib.

 

Margins can also be a combination of toothed, lobed, parted and smooth.
 

TERMS DEALING WITH LEAF MARGINS:

  • Broadly crenate  - intermediate between undulate and sinuate

  • Crenate - with low rounded or blunt teeth

  • Corrugate - describe the loose wrinkles along a margin, but on a smaller idea than undulated would imply.

  • Crenulate - with small, low rounded or blunt teeth

  • Entire - no indentations, lobes, or teeth - smooth

  • Dentate Sharp marginal teeth point outward.

  • Doubly serrate - with both small and larger serrations, twice serrated.

  • Serrate - marginal teeth pointing toward the leaf apex (saw-like)

  • Incised -

  • Serrulate - small, marginal teeth pointing toward the blade apex

  • Sinuate - deeply wavy margin towards the middle of the leaf

  • Spinose-dentate - as above with the teeth point-tiped

  • Undulate - wavy, curling from the front to the back of the leaf,  but on a larger idea than corrugated would imply.

  • Lacerate

  • Ciliate- Hair-like edge





     

 

 


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