Yam
is
the
common
name
for
members
of
the
Dioscoreaceae
family.
Some
species
are
cultivated
for
consumption
in
Africa
and
Asia.
They
are
used
as
a
potato
substitute
in
some
countries,
especially
where
potatoes
were
not
found
naturally,
and
are
often
confused
with
the
sweet
potato.
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illustrations
and
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