Ulmus americana 'Pendula'
| 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.
NB: 'Pendula' was later confused with a pendulous variant of U. glabra.
Contents
Description
The tree was described as vase-shaped with branches pendulous at their extremities.[1]
Pests and diseases
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 [2] [2], and highly preferred for feeding by the Japanese Beetle Popillia japonica [3] [3] [4] in the USA. U. americana is also the most susceptible of all the elms to verticillium wilt.[4]
Cultivation
The tree is only known to have been cultivated in the UK, where only one specimen may survive at Brighton (not mentioned in the NCCPG collection list, possibly owing to confusion with 'Beebe's Weeping'), and the Netherlands.
Hybrid cultivars
'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 [5]
Synonymy
- Ulmus americana var. glabra: Walpers, Ann. Bot. Syst. 3: 424, 1852.
Accessions
- Europe
- Brighton & Hove City Council, UK, NCCPG Elm Collection [5], 1 tree at Woodvale Crematorium (along drive).[6] See 'Cultivation'.
References
- ↑ Green, P. S. (1964). Registration of cultivar names in Ulmus. Arnoldia, Vol. 24. Arnold Arboretum, Harvard University. [1]
- ↑ 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.
- ↑ 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). pp 445-448. 2001. Entom. Soc.of America.
- ↑ Pegg, G. F. & Brady, B. L. (2002). Verticillium Wilts. CABI Publishing. ISBN 0-85199-529-2
- ↑ 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.
- ↑ Johnson, O. (1998). The Sussex Tree Book, Pomegranate Press. ISBN 0-9533493-0-6
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