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The three hybrids of Spiraea L. - Spiraea x arguta Zbl., S. x cinerea Zbl. and S. x Vanhouttei (Briot.) Zbl. studied in MBG of RAS – are shown to have a very low fruit and seeds set or no set at all. In S. x arguta and S. x cinerea this is caused by low pollen fertility, while in the examined S. x Vanhouttei it is due to self-incompatibility and absence of another specimen of the same hybrid in its vicinity