
Hydrangea_petiolaris_2024-05-23 SW Michigan USA
Climbing Hydrangea.
The white flowers are sterile and their function seems to be to attract pollinators to the more numerous and much smaller fertile flowers... https://www.indefenseofplants.com/blog/2017/6/20/the-sterile-flowers-of-hydrangea
Detail:

Hydrangea petiolaris, a Climbing hydrangea (syn: Hydrangea anomala subsp. petiolaris), is a species of Hydrangea native to the woodlands of Japan, the Korean peninsula, and on Sakhalin island of easternmost Siberia in the Russian Far East.
Similar species: Cornales
By Jon Reck
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Uploaded May 23, 2024. Captured May 23, 2024 08:30 in 9290 Milo Rd, Plainwell, MI 49080, USA.