Agave wrote:
.....................................
....................One of the things I discovered was that although
poison ivy normally has 3 leaves (or leaflets) it can also have 5 or
more. The following FDA link states the same.
http://www.fda.gov/fdac/features/796_ivy.html
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I was thinking about this discussion the other day when I was out in the
yard. Just thinking about the way nature tends to work, it would be more
of a surprise if poison ivy always had 3 leaflets and never 5. Think
about how white clover had 3 leaflets, almost always, but then there is
that occasional 4 leaf clover in the mix.

Steve