nikkoensis Rehder, the Nikko elm, was discovered as a seedling near Lake Chūzenji, near Nikkō, Japan, and obtained by the Arnold Arboretum in 1905.

[1] The taxonomy of the tree remains a matter of contention, and has been considered possibly a hybrid of U. laciniata and U. davidiana var.

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.

Trees at Great Fontley, Fareham, in southern England, grown from seed sent from Morton Arboretum and reputedly sourced in Liaoning Province, China, that were thought for many years to be Ulmus davidiana, have fruit and short petioles inconsistent with that species, but matching descriptions and photographs of Ulmus laciniata.

[9] In trials conducted by Butterfly Conservation, the specimens at Great Fontley often grew too rapidly in the comparatively benign conditions, the narrow stem unable to bear the weight of the burgeoning crown, leaving the tree arching to the ground.