Ulmus americana 'Pendula'

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Ulmus americana
Cultivar 'Pendula'
Origin England

The American Elm cultivar Ulmus americana 'Pendula' is considered probably just a forma by Green, although it was originally listed by William Aiton in Hort. Kew, 1: 320, 1789 as U. americana var. pendula, cloned in England in 1752 by James Gordon.[1][2]

NB: 'Pendula' was later confused with a pendulous variant of U. glabra.

Description[edit]

The tree was described as vase-shaped with branches pendulous at their extremities.[1]

Pests and diseases[edit]

The clone's resistance to Dutch Elm Disease is not known, but the species is highly susceptible to the disease and Elm Yellows; it is also moderately preferred for feeding and reproduction by the adult Elm Leaf Beetle Xanthogaleruca luteola [3] [1], and highly preferred for feeding by the Japanese Beetle Popillia japonica [4] [2] [3] in the United States. U. americana is also the most susceptible of all the elms to verticillium wilt.[5]

Cultivation[edit]

'Pendula' is only known to have been cultivated in the UK and the Netherlands; no surviving (2016) trees have been confirmed.

Hybrid cultivars[edit]

'Pendula' was used in the Dutch elm breeding programme before World War II, but none of the progeny were of particular note and are not known to have been cultivated [6]

Synonymy[edit]

  • Ulmus americana var. glabra: Walpers, Ann. Bot. Syst. 3: 424, 1852.

Accessions[edit]

None known.

References[edit]

  1. ^ a b Green, Peter Shaw (1964). "Registration of cultivar names in Ulmus". Arnoldia. Arnold Arboretum, Harvard University. 24 (6–8): 41–80. Retrieved 16 February 2017. 
  2. ^ Aiton, William (1789). "Ulmus". Hortus Kewensis. 1: 320. 
  3. ^ Miller, F. and Ware, G. (2001). Resistance of Temperate Chinese Elms (Ulmuss spp.) to Feeding of the Adult Elm Leaf Beetle (Coleoptera: Chrysomelidae). Journal of Economic Entomology 94 (1): 162–166. 2001. Entom. Soc.of America.
  4. ^ Miller, F., Ware, G. and Jackson, J. (2001). Preference of Temperate Chinese Elms (Ulmuss spp.) for the Feeding of the Japanese Beetle (Coleoptera: Scarabaeidae). Journal of Economic Entomology 94 (2). 445–448. 2001. Entom. Soc.of America.
  5. ^ Pegg, G. F. & Brady, B. L. (2002). Verticillium Wilts. CABI Publishing. ISBN 0-85199-529-2
  6. ^ Went, J. C. (1954). The Dutch elm disease - Summary of 15 years' hybridisation and selection work (1937-1952). European Journal of Plant Pathology, Vol 60, 2, March 1954.