Zelkova serrata
Zelkova" × "verschaffeltii (cut-leaf zelkova) is a zelkova cultivar of hybrid origin. It was originally described in 1892 by Leopold Dippel from a cultivated plant as "Zelkova japonica" var. "verschaffeltii", suggesting an eastern Asian origin. In 1896, George Nicholson raised it to species rank as "Zelkova verschaffeltii", while its much closer similarity to "Zelkova carpinifolia" led Augustine Henry to suggest it might be a hybrid between "Zelkova carpinifolia" and "Zelkova abelicea". More recent authors most widely regarded it as a cultivar, either not ascribed to any "Zelkova" species in particular, or placed under "Z. carpinifolia" with no suggestion of hybrid origin. Analysis of flavonoids has subsequently proved that it is a hybrid between "Zelkova carpinifolia" and "Zelkova serrata".