Dyphylleia cymosa,(Umbrella Leaf) or Diphylleia grayii, (Skeleton Flower). Native to the Southeastern U.S. D. grayii, Skelton flower has white petals that turn transluscent when they get wet. Barberry family, Berberidaceae, yes related to Podophyllum. It could also be the Asian Diphylleia sinensis, since you seem to grow a lot of exotics? I wish I could grow it. I especially like the fact that the flowers are above the umbrellas, and not hidden undernesth like Podophylum. Much easier to photograph. DIPHCYM DYPHGRA

https://www.jstor.org/stable/43782133

there is a name that plant forum.. but jay found you here.. so you dont have to look for him there....

I did not know about the "Name that plant" forum, thanks. I'm sure Jay is correct, but I added that forum to the post in case someone has any more info to share.

I always look at both forums so I would have caught you here anyway. You can keep posting on both so that noone can beat me to them.😂😂