Oak Leaf Hydrangeas

Yesterday while walking in Central Park with my daughter and new baby granddaughter, a new variety of Oak Leaf Hydrangea caught my eye. The leaves on the bush look just like the Oak Leaf Hydrangea I have at home. All the varieties are in full bloom with gorgeous white clusters of flowers, but the shape of the flowers on this one were new to me. Amateur Botanists, do you know what this is called?

IMG_4676