Ulmus wallichiana subsp. xanthoderma

Ulmus wallichiana subsp. xanthoderma
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Rosales
Family:	Ulmaceae
Genus:	Ulmus
Species:	U. wallichiana
Subspecies:	U. w. subsp. xanthoderma
Trinomial name
	Ulmus wallichiana subsp. xanthoderma ; Melville & Heybroek
Synonyms
	Ulmus brandisiana C. K. Schneid.;

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]

U. wallichiana ssp. xanthoderma leaf
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

^ ^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. ISBN 9780719517907 [1]
^ "Herbarium specimen - L.1582387". Botany catalogues. Naturalis Biodiversity Center. U. wallichiana subsp. xanthoderma, leaves specimen (Melville & Heybroek); Baba Reshi, Gulmarg, Kashmir, India (1960); "Ulmus wallichiana subsp. xanthoderma K000442471". Herbarium catalogue. Board of Trustees of the Royal Botanic Gardens, Kew. Retrieved 17 October 2016.; "Ulmus wallichiana subsp. xanthoderma K000852680". Herbarium catalogue. Board of Trustees of the Royal Botanic Gardens, Kew. Retrieved 17 October 2016.; "Ulmus wallichiana subsp. xanthoderma, leaves and samarae K000852681". Herbarium catalogue. Board of Trustees of the Royal Botanic Gardens, Kew. Retrieved 17 October 2016.