U. nitens var. betulaefolia Henry, apps.kew.org "Ulmus nitens v. betulaefolia specimen K000852668". Herbarium catalogue. Board of Trustees of the Royal Botanic Gardens, Kew. Retrieved 17 October 2016.
vplants.org
"Herbarium specimen 15191". Chicago Botanic Garden Herbarium. Sheet labelled Ulmus carpinifolia Gled. cv. 'Betulaefolia'; Morton Arboretum specimen [samarae and new leaves] (1994), from Hesse nursery, Germany, as U. campestris var. betulaefolia