Finally got some blooms on my P. nephrodes--at least 13 of them today. I had seen a couple of buds, but the rest must have hidden themselves very well. The flower is smaller than I expected from photos that I had seen--they are about the size of a Lady Margaret. Unfortunately, the Lady Margaret was all I had blooming, so that was the only vine I could use the pollen on. I love all the short filaments on this one. It's definitely a keeper.
Here's a pic: