Doug Freyburger wrote:
>
> Technically, yams are a class of root vegitable from Africa. They don't
> appear in the US unless you can maybe find one in a specialty store that
> focuses on recent immigrants. What we call yams in the US are sweet
> potatoes. If you like one variety but not the other you're splitting a
> finer hair than I'm able to do.

Yams are grown in several regions of the world but they happen to be
native to New Guinea, not Africa. However there are yam species that
are native to the US. Yams are found in most ethnic US markets,
especially Hispanic.

http://www.nanps.org/index.php/resou...a-wild-yam-5-4