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Simple

This term is most often used with reference to the shape of leaves.  A "simple" leaf is a leaf with a blade that is not divided into distinct segments (i.e., leaflets).  In other words, the blade of a simple leaf is not "compound".  Leaf blades that are lobed are also considered "simple", even those that have deep sinuses.  (Compare with compound.)
 

Figure A.  Simple, unlobed leaves of paper birch.
(Betula papyrifera)

 

Figure B.  Simple, lobed leaves of tulip tree.
(Liriodendron tulipifera)

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