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Sepal

A sepal is a member of the outermost set of floral "leaves", often green. (Botanists consider petals and sepals to be  modified forms of leaves.) The complete set of sepals of a flower is called the calyx.  Some flowers lack petals, but if the sepals are brightly colored, they may appear to be petals.  When both sepals and petals are both present, the sepals are located below or beneath the petals.
 
Figure A.  Petals and sepals of toothwort.
(Cardamine diphylla)
 
Figure B.  Petals and sepals of white campion.  Five
sepals are fused to form a sac.  (Silene latifolia)
 
Figure C.  Sepals of rue anemone, appearing like petals.
Petals are lacking.  (Thalictrum thalictroides)

 

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