Deuterocohnia longipetala seems a good match, depending on whether the photos you see are correct. the leaves on the fcbs show them to be silver but that could be variable. Looking at the photo it does say 'silver form'!
http://fcbs.org/cgi-bin/dbman/...
I've checked other species, none look to come close ..
http://fcbs.org/cgi-bin/dbman/...