The Chinese ElmcultivarUlmus parvifolia 'Pendens' was listed by Rehder in Journal of the Arnold Arboretum 26: 473, 1872 as Ulmus parvifolia f. pendens. The tree originated in California before 1930 from seed received from China.[1]
^Krüssmann, Johann Gerd, Handbuch der Laubgehölze (Vol. 3) (Paul Parey, Berlin and Hamburg, 1976); trans. Michael E. Epp, Manual of Cultivated Broad-Leaved Trees and Shrubs (Vol. 3) (Batsford, Timber Press, Beaverton, Oregon, 1984-6), p.411