Ulmus wallichiana subsp. wallichiana explained

Ulmus wallichiana subsp. wallichiana was identified by Melville and Heybroek after the latter's expedition to the Himalaya in 1960.[1]

Description

A deciduous tree growing to 30 m with a crown comprising several ascending branches. The bark of the trunk is grey-brown, furrowed longitudinally. The leaves range from 6 - 13 cm long by 2.5 - 6 cm broad, elliptic-acuminate in shape,[2] and with a glabrous upper surface, on petioles 5 - 10 mm long. The samarae are orbicular to obovate, 10 - 13 mm in diameter, on 5 mm pedicels, the seed central.[1]

Pests and diseases

The tree has a high resistance to the fungus Ophiostoma himal-ulmi endemic to the Himalayas and the cause of Dutch elm disease there.[1]

Cultivation

The tree is not known to be in cultivation beyond the Himalaya.

Notes and References

  1. Melville, R. & Heybroek, H. (1971). Elms of the Himalaya. Kew Bulletin, Vol. 26 (1). Kew, London.
  2. Web site: Herbarium catalogue. Ulmus wallichiana subsp. wallichiana K000852684. Board of Trustees of the Royal Botanic Gardens, Kew. 17 October 2016.
    Web site: Herbarium catalogue. Ulmus wallichiana subsp. wallichiana K000852685. Board of Trustees of the Royal Botanic Gardens, Kew. 17 October 2016.