Photo: Hydrangea serrata 1.

cv. ('Bluebird'?) One flower cluster left on a smallish bush. Marburg bot.g., Germany. Planted. 2006-10-02.
Hydrangea serrata (Thunb.) Ser. Sven.: purpurhortensia. Bot. syn.: Hydrangea acuminata Sieb. & Zucc.
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Photo: Hydrangea serrata 1.