Ulmus_'Regal' ''University of Wisconsin-Madison and released in 1983. Raised by the United States National Arboretum, 'Regal' shares the same complex ancestry as 'Homestead', and 'Urban', being derived from the crossing of the Siberian Elm Ulmus pumila with ('Commelin' × (Ulmus pumila × 'Hoersholmiensis')).