It has been a long wait, but I finally have some seedlings of bladdernut (Staphylea trifolia).
I collected the seeds in 2013 and started them in plastic bags with some damp potting mix. The shiny light brown seeds require about 3 months cold followed by 3 months warm and then another 3 months of cold moist stratification before they break dormancy. I put them in the fridge after the warm period and then forgot about them, so they ended up in the fridge for about 6 months.
Update 12-14-2014: Most of the plants have put on 2 new sets of leaves.