The Chinese elm cultivar Ulmus parvifolia 'Sempervirens' is an American introduction from south China,Wilkinson, Gerald, Epitaph for the Elm (London 1978), p.87 commonly known by the synonym 'Evergreen'. It was first listed by Bailey & Bailey in Hortus Second, 747, 1941.
Description Semi-evergreen to evergreen depending on climate, it is described as having a rounded crown and gracefully arching branches bearing deep-green foliage.
Pests and diseases The species and its cultivars are highly resistant, but not immune, to Dutch elm disease, and unaffected by the elm leaf beetle Xanthogaleruca luteola.
Cultivation The tree remains in commercial cultivation in the USA. Wilkinson states that it was cultivated in Florida. It is not known to be in cultivation in Europe or Australasia.
Synonymy Ulmus parvifolia 'Evergreen': Plant Buyer's Guide, ed. 5, 253, 1949. Ulmus parvifolia 'Pendens', possible synonym.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 Ulmus parvifolia sempervirens 'True Green': Monrovia Nursery Catalogue, 1971.
Accessions North America
Bartlett Tree Experts, North Carolina, US. Acc. no. 1451 Brooklyn Botanic Garden , New York, US. Acc. no. X00486.
Nurseries North America
C J Growers, San Diego, California, US. ForestFarm , Williams, Oregon, US. (as 'Evergreen'). Monrovia Nursery , Azusa, California, US.
References
External links http://www.ces.ncsu.edu/depts/hort/consumer/factsheets/trees-new/cultivars/ulmus_parvifolia.htm Ulmus parvifolia cultivar list.