Plant ID: flowering perennial

My sister took pictures of a beautiful plant that I can’t identify. It’s so pretty, you’d think it would be all over the net.
I’m coming up with something in the Araceae or Brassaiopsis families, but not any of the ones I see.
Was taken June 26, 2017 near Stratford CT, at a hotel.
Anyone know what this is? It’s lovely

Looks like a hydrangea. Either oakleaf or peegee?

Oakleaf Hydrangea, you win Janet Begg!! THANK YOU!!

No clue why I didn't find that in over an hour of digging on the net.

Definitely Oak Leaf Hydrangea.

It's funny, I have a ton of hydrangeas and they all do well in my Oak based forest soil, except for the Oak leaf hydrangea. I had one and it eventually died. I guess it doesn't like soil that is as acid as mind. They are beautiful though!