English: Hydrangea family.
Botany: 17 genera; 220 species; shrubs; worldwide.
In the Apg3 classifcation Hydrangeaceae is placed in the Order Cornales, closely related to Loasaceae. In the Cronquist classification Hydrangeaceae was placed in Saxifragales.
In the Plant theory Hydrangeaceae is treated in the same way and placed in Subphase 5.