Friday 17 May
St Helena gumwood (Commidendrum robustum)
St Helena gumwood fact file
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St Helena gumwood description
Adopted as the national tree of St Helena in 1977, this highly branched tree has a knarled and crooked trunk and an umbrella-like canopy (1) (2). It produces white flower heads which droop from the ends of branches in the winter and spring months (2). The leaves are seven to ten centimetres long and vary from grey-green to dark green. They are wrinkled, thick and hairy (3).
- Height: 5 – 8 m (2)
St Helena gumwood biologyTop
St Helena gumwood rangeTop
St Helena gumwood habitat
The St Helena gumwood previously formed subtropical and tropical forest on inland cliffs and mountain peaks (1).Top
St Helena gumwood status
The St Helena gumwood is classified as Endangered (EN) on the IUCN Red List (1). The subspecies Commidendrum robustum gummiferum is classified as Extinct (EX) and the subspecies Commidendrum robustum robustum is classified as Endangered (EN) (1).Top
St Helena gumwood threats
St Helena was settled in 1659 and since then the St Helena gumwood has been exploited for use as timber and firewood. Forests were cleared for use as pastureland and introduced goats grazed heavily on seedlings. Populations were reduced to extremely low numbers by the 1980s, at which point a conservation management plan was started. In 1991, the largest population at Peak Dale was attacked by the jacaranda bug, Orthezia insignis. This sucking insect took sap from the trees and encouraged a black mould that rapidly killed infected trees (2).Top
St Helena gumwood conservation
Protected by the Endangered Endemic and Indigenous Species Protection Ordinance 7 of 1996, the St Helena gumwood has been the focus of a conservation programme started in the 1980s. An extremely successful biological control programme to combat the jacaranda bug involved the introduction of the ladybird Hyperaspis pantherina from Kenya (2). Following dangerous reductions in populations of the St Helena gumwood, the Millennium Gumwood Forest Project was started and resulted in the planting of 4,300 trees in a previously degraded wasteland in 2000 (2). Other replanting projects are underway, as well as weed clearances (3). Although it is not thought that any pure trees of the subspecies Commidendrum robustum gummiferum exist, the hybrid population at Peak Dale shows some characteristics of this subspecies (4).Top
Find out more
For more information on St Helena see:
- St Helena National Trust:
- Cock, M.J.W. (2003) Risks of Non-Target Impact Versus Stakeholder Benefits in Classical Biological Control of Arthropods: Selected Case Studies from Developing Countries. In: Van Driesche, R.G. (Ed.) Proceedings of the International Symposium on Biological Control of Arthropods, Honolulu, Hawaii, 14-18 January 2002. United States Department of Agriculture, Forest Service, West Virginia, USA. Available at:
AuthenticationThis information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact: email@example.comTop
- A species or taxonomic group that is only found in one particular country or geographic area.
- The beginning of growth, usually following a period of dormancy and in response to favourable conditions. For example, the sprouting of a seedling from a seed.
- Possessing both male and female sex organs.
- The offspring produced by parents of two different species or subspecies.
- A population usually restricted to a geographical area that differs from other populations of the same species, but not to the extent of being classified as a separate species.
- IUCN Red List (September, 2008)
- Global Trees Campaign (November, 2004)
- Gumwood (November, 2004)
- Joint Nature Conservation Committee (September, 2008)
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