⚠ Version 1 of The Plant List has been superseded.

This name record (from Tropicos) is not included in version 1.1 of The Plant List. It is possible the same name is included from a different data source, to check this you can search for Hydrangea hortensia in version 1.1 of The Plant List.

Hydrangea hortensia var. otaksa A. Gray is a synonym of Hydrangea macrophylla (Thunb.) Ser.

This name is a synonym of Hydrangea macrophylla (Thunb.) Ser..

The record derives from Tropicos which reports it as a synonym (record 50078458) with original publication details: 6: 312 312 1857.