Biology:Ulmus wallichiana subsp. xanthoderma

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Short description: Subspecies of elm

Ulmus wallichiana subsp. xanthoderma
Scientific classification edit
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 leaf
  • U. wallichiana ssp. xanthoderma samara
    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

  1. ↑ 1.0 1.1 1.2 Melville, R. & Heybroek, H. (1971). Elms of the Himalaya. Kew Bulletin, Vol. 26 (1). Kew, London.
  2. ↑ 2.0 2.1 Bean, W. J. (1970). Trees & Shrubs Hardy in the British Isles, 8th ed., (2nd impression 1976) John Murray, London. ISBN:9780719517907 [1]
  3. ↑ "Herbarium specimen - L.1582387". Botany catalogues. Naturalis Biodiversity Center. http://data.biodiversitydata.nl/naturalis/specimen/L.1582387.  U. wallichiana subsp. xanthoderma, leaves specimen (Melville & Heybroek); Baba Reshi, Gulmarg, Kashmir, India (1960); "Ulmus wallichiana subsp. xanthoderma K000442471". Board of Trustees of the Royal Botanic Gardens, Kew. http://apps.kew.org/herbcat/getImage.do?imageBarcode=K000442471. ; "Ulmus wallichiana subsp. xanthoderma K000852680". Board of Trustees of the Royal Botanic Gardens, Kew. http://apps.kew.org/herbcat/getImage.do?imageBarcode=K000852680. ; "Ulmus wallichiana subsp. xanthoderma, leaves and samarae K000852681". Board of Trustees of the Royal Botanic Gardens, Kew. http://apps.kew.org/herbcat/getImage.do?imageBarcode=K000852681. 

Wikidata ☰ Q7879644 entry



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