However, in crossability experiments at the Arnold Arboretum in the 1970s, U. laciniata, a protogynous species, was found to be incompatible with U. davidiana var.
On the other hand, studies conducted at the Arnold Arboretum in the 1970s revealed that U. laciniata, a type of plant that exhibits both male and female reproductive organs, could not be crossed with U. davidiana var.