A flower may comprise four organs
   made of modified leaves:
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<BR><LI> Sepals enclose the flower.
<BR><LI> Petals may be brightly colored to attract pollinators.
<BR><LI> Stamens produce pollen that contain sperm.
<BR><LI> Carpels produce ovaries that contain eggs.
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   A complete flower has all four basic floral organs.
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   A perfect flower contains both male and female structures.
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   An imperfect flower may be
<BR><LI> staminate and contains no carpels, or
<BR><LI> carpellate and contains no stamens.
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