Ulmus wallichiana subsp. xanthoderma
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The elm Ulmus wallichiana subsp. xanthoderma was identified by Melville and Heybroek after the latter's expedition to the Himalaya in 1960.[1] The tree is of more western distribution than subsp. wallichiana, ranging from Afghanistan to Kashmir.[2]
Description
A deciduous tree growing to 30 m with a crown comprising several ascending branches. The bark of the trunk is pale grey, coarsely furrowed longitudinally. The branchlets become orange- or yellow-brown, glandular at first, not hairy. The leaves range from 5.6–14 cm long by 3–7.5 cm broad, elliptic-acuminate in shape,[3] and with a glabrous upper surface, on petioles 7–10 mm long. The inflorescence is slightly glandular, almost glabrous. The samarae are orbicular to obovate, with a few glandular hairs; the seed central.[1][2]
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U. wallichiana ssp. xanthoderma leaf
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U. wallichiana ssp. xanthoderma samara
Pests and diseases
The tree has a high resistance to the fungus Ophiostoma himal-ulmi endemic to the Himalaya and the cause of Dutch elm disease there.[1]
Cultivation
There are a few trees planted in England and The Netherlands. It is not known in North America or Australasia.
Accessions
Europe
- Grange Farm Arboretum, Lincolnshire, UK. Acc. no. 643 (Heybroek's clone P296).
- Wijdemeren City Council Elm Arboretum, 1 tree planted Brilhoek, Nederhorst den Berg 2019, tree number: 112793
References
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- ↑ a b c Melville, R. & Heybroek, H. (1971). Elms of the Himalaya. Kew Bulletin, Vol. 26 (1). Kew, London.
- ↑ a b Bean, W. J. (1970). Trees & Shrubs Hardy in the British Isles, 8th ed., (2nd impression 1976) John Murray, London. Template:ISBN [1]
- ↑ Template:Naturalis Biodiversity Center U. wallichiana subsp. xanthoderma, leaves specimen (Melville & Heybroek); Baba Reshi, Gulmarg, Kashmir, India (1960); Script error: No such module "citation/CS1".; Script error: No such module "citation/CS1".; Script error: No such module "citation/CS1".
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