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Cypripedium japonicum
It is very interesting to hear just how much water super coarse perlite holds in a pot.
It's Cypripedium formosanum Steve, japonicum has green petals and slightly different shaped pouch: http://www.orchidspecies.com/cypjaponicum.htm
Very nice, David. Lovely specimens.Here is Cypripedium farreri from Hengduan this year.Alex