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     Picture (17x22, 698 bytes)   tree has broad leaves
       Picture (17x22, 698 bytes)  opposite branching
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Compound leaves
 (A single leaf with numerous leaflets.  Leaflets are smaller parts of leaves that often resemble leaves themselves and join together along the leaf stem.  A leaf actually begins where the woody twig ends.) 
Example:
Compound leaf

 
Simple leaves
(The leaf stem is the same as the main vein for that leaf.)
Example:
Picture (155x204, 3.8Kb)