What the Heck is WMZ in Hoya sp. IV From WMZ?

It took a little bit of research, but I finally found out what WMZ stand for.  It is an abbreviation for Welsh Mountain Zoo, which is a zoo that has a wonderful 37 acre botanical garden in Northern Wales, UK.  It houses plants from all over the world, and has a number of unique Hoyas in the collection.

Hoya sp. IV From WMZ 033016