 Although the mosaic of characters in "Hironoia" precludes assignment to an extant genus, the fiber rather than sclereid composition of the fruit places it within the Nyssaceae-Mastixiaceae.Other possible Cornaceae from Cretaceous sediments include endocarps resembling Cornus from the Santonian-Campanian mesofossil
assemblage of Åsen.In slightly younger Late Cretaceous sediments (Maastrichtian) four genera of fossil mastixioid fruits ("Beckettia", "Eomastixia", "Mastixicarpum" and "Mastixiopsis") have been described from Germany.