Hydrangeas

It's a genus of climbing plants or shrugs. The Hydrangeas belong to the Hydrangeaceae family, and there are 23 species being natives in southern, and eastern Asia.

Its flower heads are flattened, and the showy clusters of flowers can occur in blue, pink, or white.

Flowers, buds and leaves of a Hydrangea

https://en.wikipedia.org/wiki/Hydrangea#/media/File:Hydrangea_May_2012-1.jpg

[1] Michael Allaby, "Hyrdangea," A Dictionary of Plant Sciences. http://www.encyclopedia.com/topic/hydrangea.aspx#2

[2] "Hydrangea," World Encyclopedia. http://www.encyclopedia.com/topic/hydrangea.aspx#3