According to Kew Species Profiles[KSP]
- General Description
Few trees are under greater threat from increases in sea level due to climate change than poke-me-boy, found almost exclusively on one of the British Virgin Islands (Anegada), which stands only 8 m above the Caribbean Sea.
Until recently, Vachellia anegadensis was known only from Anegada, a low-lying coral limestone island (sometimes called the ‘drowned island’) in the British Virgin Islands (BVI). These Caribbean islands comprise one of the UK Overseas Territories (UKOTs). Taken overall, they are rich in plant diversity, with over 700 native species, but those species which occur only on a single island are particularly threatened by the potential effects of climate change, as they may have very specific habitat requirements. In 2008, one of Kew’s botanists, Colin Clubbe, discovered a small population of poke-me-boy growing on Fallen Jerusalem, another of the BVI, where environmental conditions are different from those on Anegada. In 2005, some species of the genus Acacia were transferred to the genus Vachellia Wight & Arn., including V. anegadensis.
- Species Profile
Geography and distribution
Vachellia anegadensis occurs only in the British Virgin Islands in the Caribbean.
Kew’s work in the British Virgin Islands
Kew has had connections with the BVI since the early years of the 20th century, when Kew gardener Walter Fishlock became an agricultural instructor on Tortola. During his time in the BVI he accompanied the American botanist, Nathaniel Britton, on a plant-collecting expedition to Anegada, during which Vachellia anegadensis was discovered. Britton named the species after the island where it was found (and later named a genus Fishlockia after him for this species). In 2005, some species of the genus Acacia, including poke-me-boy, were transferred to the genus Vachellia Wight & Arn.
More recently, conservationists from Kew’s UK Overseas Territories team have carried out intensive botanical studies on Anegada during the course of a project to assess the coastal biodiversity of the island and develop an action plan for its protection. Kew botanists are collaborating on a field guide to the islands’ plants, as well as continuing fieldwork throughout BVI to support the BVI National Parks Trust and other local partners.
Vachellia anegadensis is an extremely spiny shrub or small tree, hence its local name of poke-me-boy. Its leaves are divided into up to four pairs of small leaflets. Clusters of tiny flowers form vivid yellow pompoms. Its curved pods (fruits) are typical of the legume family (the peas and beans), and split open, releasing the seeds.
Threats and conservation
According to IUCN Red List criteria, Vachellia anegadensis is considered to be Critically Endangered, because it lives in a very small area (less than 10 km²), much of which is under threat from housing and hotel developments. It could also face difficulties if sea levels around Anegada rise as a result of global climate change, both from further reductions in the area of suitable habitat and from inundation with salt water. Invasive plants on the island, such as Casuarina equisetifolia, could also overwhelm the tree and its habitat.
The discovery of additional specimens of poke-me-boy on Fallen Jerusalem is cause for optimism, as this island is volcanic in origin and rises to a greater height above sea level than Anegada. Although it is even smaller in size than Anegada, Fallen Jerusalem is already a National Park where building is forbidden.
Vachellia anegadensis is in cultivation in the J R O’Neal Botanic Garden on Tortola, the largest island in the BVI. It is also being grown in the nursery glasshouses at Kew. Seeds collected from trees in the wild are in safe storage in Kew’s Millennium Seed Bank.
Although poke-me-boy is not currently used by islanders, reports in the older literature suggest that it was formerly cut for timber, and resin extracted from the tree was used to seal the hulls and decking of boats.
Millennium Seed Bank: Seed storage
Kew's Millennium Seed Bank Partnership aims to save plant life world wide, focusing on plants under threat and those of most use in the future. Seeds are dried, packaged and stored at a sub-zero temperature in our seed bank vault.
Search Kew's Seed Information Database for details on Vachellia anegadensis seeds
This species at Kew
Vachellia anegadensis is currently grown in Kew’s behind-the-scenes nursery glasshouses where horticulturists are investigating the best environmental conditions for its cultivation.
Pressed and dried specimens of poke-me-boy, including some collected by Kew gardener Walter Fishlock, are held in Kew’s Herbarium, where they are available to researchers by appointment.
Kew's species profile for poke-me-boy ( Vachellia anegadensis) - a Critically Endangered shrub or small tree from Anegada (one of the British Virgin Islands), which is under great threat from increases in sea level due to climate change.
- British Virgin Islands
- Most commonly on limestone rocks that form most of the land surface of eastern Anegada.
- Critically Endangered (CR) according to IUCN Red List criteria.
No known health hazards, but difficult to handle due to its spines.
First published in Phytologia 87: 142 (2005 publ. 2006)
-  (2012) Smithsonian Contributions to Botany 98: 1-1192
-  (2009) Systematic Botany 34: 84-101
-  Kyalangalilwa, B., Boatwright, J. S., Daru, B. H., Maurin, O. and Van der Bank, M. (2013). Phylogenetic position and revised classification of Acacia s.l. (Fabaceae: Mimosoideae) in Africa, including new combinations in Vachellia and Senegalia. Bot. J. Linn. Soc. 172: 500-523.
-  McGowan A., Broderick, A. C., Clubbe, C., Gore, S., Godley, B. J., Hamilton, M., Lettsome, B., Smith-Abbott, J. & Woodfield, N. K. (2006). Darwin Initiative Action Plan for the Coastal Biodiversity of Anegada, British Virgin Islands. 13 pp.
-  Clubbe, C., Gillman, M., Acevedo-Rodríguez, P. & Walker, R. (2004). Abundance, distribution and conservation significance of regionally endemic plant species on Anegada, British Virgin Islands. Oryx 38: 342-346.
International Plant Names Index
The International Plant Names Index (2016). Published on the Internet http://www.ipni.org
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Kew Species Profiles
Kew Species Profiles
World Checklist of Selected Plant Families
World Checklist of Selected Plant Families(2016). Published on the Internet http://apps.kew.org/wcsp/
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