Tahina spectabilis (dimaka)
Large enough to be visible in satellite imagery, dimaka is an enormous ‘self-destructive’ palm that remained undetected by science until 2007.
Species information
- Scientific name: Tahina spectabilis J.Dransf. & Rakotoarin.
- Common name(s): dimaka
- Conservation status: Not yet assessed according to IUCN Red List criteria.
- Habitat: Grows at low elevation in fertile, seasonally-flooded soils at the foot of a limestone outcrop.
- Key uses: None known.
- Known hazards: None known.
Taxonomy
- Class: Equisetopsida
- Subclass: Magnoliidae
- Superorder: Lilianae
- Order: Arecales
- Family: Arecaceae
- Genus: Tahina
About this species
Large enough to be visible in satellite imagery, Tahina spectabilis, commonly known as dimaka, is an enormous ‘self-destructive’ palm that remained undetected by science until 2007. Its extraordinary appearance and genetic evidence indicate that this palm belongs in a genus of its own within a group of palms originally thought to be restricted to Asia. Efforts are now underway to conserve this species through distribution of seed and cultivation in botanic gardens.
Geography & Distribution
Northwest Madagascar - confined to a small area in Analalava district.
Description
Flowering parts of Tahina spectabilis (Image: John Dransfield)
Tahina spectabilis has a huge trunk, with a swollen base, and a 4 to 10 m high crown comprising about twelve fan-shaped leaves up to 5 m in diameter. Dead leaves are retained below the new growth but eventually fall under their own weight as the tree gets larger. The trunk is covered by ring scars left by the fallen leaves.
When flowering commences, the tip of the stem extends above the dense green crown, expanding into an impressive pyramidal, candelabra-like inflorescence (around 4-5 m in height) which at maturity explodes with a multitude of tiny yellow flowers.
Threats & Conservation
Tahina spectabilis to scale (Image: John Dransfield)
As with all of Madagascar’s wildlife the biggest threat to this palm is likely to be habitat loss. It is particularly vulnerable because it has a very small population size (estimated at 90 individuals) and a restricted range, meaning that even small-scale impacts could be potentially devastating. Since the 1970s, approximately one-third of Madagascar’s primary vegetation has disappeared, mainly as a direct result of fires, logging and clearance of land for agriculture.
How you can help Kew save the world’s plant life and habitats at risk of extinction
Tahina spectabilis seeds have been sent to:
National Tropical Botanical Garden, Kalaheo, Hawai
Fairchild Tropical Botanic Garden, Miami, USA
Montgomery Botanical Center, Miami, USA
Honolulu Botanical Gardens, Hawai, USA
Royal Botanic Gardens & Domain, Sydney, Australia
Townsville Palmetum, Townsville, Australia
Durban Botanic Garden, Durban, South Africa
Singapore Botanic Gardens, Singapore
Kebun Raya Indonesia, Bogor
Jardim Botânico da Universidade de Coimbra, Coimbra, Portugal
Palmetum of Santa Cruz, Santa Cruz, Tenerife, Spain
Uses
Uses for Tahina spectabilis are not known. As a rare species, it is likely to be prized as an ornamental.
Cultivation
Propagation of this palm has been achieved by seed-sowing at Kew. Seeds were sown during February, having been soaked in water for 24 hours prior to sowing. The seed compost included Seramis (clay granules) and perlite. Two months after sowing, 80% of the seeds had germinated. The seedlings were potted up individually into ‘long tom’ pots. After three years (in early 2011), the plants were still growing well.
Useful Links
Search Kew's science databases for more information on Tahina spectabilis
Read more about the arrival of Tahina spectabilis seeds at Kew's Millennium Seed Bank here
The Guardian (11 Sept 2012): World's 100 most endangered species
Priceless or Worthless (IUCN list of 100 most endangered species)
References & Credits
Dransfield, J., Rakotoarinivo, M., Baker, W. J., Bayton, R. P., Fisher, J. B., Horn, J. W., Leroy, B. & Metz, X. (2008). A new Coryphoid palm genus from Madagascar. Botanical Journal of the Linnean Society 156: 79–91.
Dransfield, J., Leroy, B., Metz, X. & Rakotoarinivo, M. (2008). Tahina – a new palm genus from Madagascar. Palms 52: 31–39.
Kew Science Editor: William Baker
Kew contributors: Sustainable Uses Group; John Sitch and Steve Ketley (Horticulture team, Jodrell Glass)
Copyediting: Kew Publishing
Kew would like to thank the following contributors: Emma Crawforth
Authored in partnership with ARKive. For thousands of videos, images and fact-files illustrating the world's species visit www.arkive.org
Although every effort has been taken to ensure that the information contained in these pages is reliable and complete, notes on hazards, edibility and suchlike included here are recorded information and do not constitute recommendations. No responsibility will be taken for readers’ own actions. Full website terms and conditions
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