Encephalartos woodii

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Wood's cycad
Encephalartos woodii original stem Durban Botanic Gardens 04 09 2010.JPG
A large stem of Encephalartos woodii at the
Durban Botanic Gardens

Extinct in the Wild (IUCN 3.1)[1]
CITES Appendix I (CITES)
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Clade: Gymnosperms
Division: Cycadophyta
Class: Cycadopsida
Order: Cycadales
Family: Zamiaceae
Genus: Encephalartos
Species:
E. woodii
Binomial name
Encephalartos woodii

Encephalartos woodii, Wood's cycad, is a rare

Durban Botanic Garden and director of the Natal Government Herbarium of South Africa, who discovered the plant in 1895.[3]

Description

It is

palm tree like, and can reach a height of 6 metres (20 ft). The trunk is about 30–50 centimetres (12–20 in) in diameter, thickest at the bottom, and topped by a crown of 50–150 leaves. The leaves are glossy and dark green, 150–250 centimetres (59–98 in) in length, and keeled with 70–150 leaflets, the leaflets falcate (sickle-shaped), 13–15 centimetres (5–6 in) long and 20–30 millimetres (0.8–1 in) broad.[4][5]

E. woodii is

dioecious, meaning it has separate male and female plants; however, no female plant has ever been discovered. The male strobili are cylindrical, 20–40 centimetres (7.9–16 in) long, exceptionally up to 120 centimetres (47 in), and 15–25 centimetres (6–10 in) in diameter; they are a vivid yellow-orange colour. A single plant may bear from around six to eight simultaneously.[4][5]

Taxonomy

Encephalartos woodii was first described by Wood as a

natural hybrid between E. natalensis and E. ferox.[4] To determine the relationship between E. natalensis and E. woodii, the RAPD technique was used to generate genetic fingerprints and data analysed using distance methods. Based on RAPD fingerprints, the intraspecific genetic variation among different E. natalensis plants is similar to the interspecific variation between E. natalensis and E. woodii, which confirms the close relationship between E. natalensis and E. woodii.[6]

Distribution and habitat

Original distribution

The only known wild plants of E. woodii were a cluster of four stems of one plant discovered by Wood in 1895 in a small area of

Ngoya Forest,[7] now known by its proper Zulu name of oNgoye, which is in KwaZulu-Natal, South Africa.[8] The site where this plant was found was on a steep south-facing slope[2][9] on the fringes of the forest.[9] The annual rainfall at the site ranges between 750–1,000 millimetres (30–39 in), and the climate has hot summers and mild winters.[2]

Removal from natural habitat

A basal offset of the main stems was removed and sent to

guinea from Sander & Sons.[11] In a 1907 expedition, Wylie collected two of the larger stems and noted that of the remaining two, one of them (the largest of the four original stems) was badly mutilated and he did not expect it to survive.[9] By 1912 there was only one 3 metres (9.8 ft) tall trunk left in the wild, and in 1916, the Forestry Department arranged to have it removed and sent to the Government Botanist in Pretoria.[9] It is thought that this trunk subsequently died in 1964.[9]

Current distribution

These plants are currently distributed in various botanical institutions around the world.

Orto Botanico di Napoli in Italy,[18] although this specimen may have died. The specimen in Ireland at Glasnevin is said to be "probably the tallest" specimen of E. woodii in Europe.[10]

Conservation status

Despite numerous excursions in the oNgoye-Mtunzini area, no other specimens of Encephalartos woodii have ever been found. All known specimens of Encephalartos woodii are clones of the only known male plant which was completely removed from the wild. For these reasons, the plant is considered extinct in the wild.[1]

Legislation

As is the case with all members of the genus Encephalartos, Encephalartos woodii is protected by both national and international legislation:[4]

In South Africa one requires a permit from Nature Conservation to move, sell, buy, donate, receive, cultivate and sell Endangered Flora and to own adult cycads. On an international level all species and hybrids of Encephalartos are on

Appendix I of CITES, the Convention on International Trade in Endangered Species of Wild Fauna and Flora. This means that wild collected material may not be traded and for each and every artificially cultivated Encephalartos plant or piece of a plant or a cone or pollen or seed, being carried over an international border requires a CITES Export Permit issued by the authority of the exporting country, and a CITES Import Permit issued by the authority of the importing country.[4]

Reproduction and propagation

Vegetative reproduction

Encephalartos woodii reproduces with rapidly growing suckers.[4][5]

Sexual reproduction

Unless a female plant is found, E. woodii will never reproduce naturally. This species is known to form fertile hybrids with E. natalensis, and a backcrossing technique can be used: if each offspring is subsequently crossed with E. woodii and the process is then repeated, after several generations, female offspring will be closer to what a female Encephalartos woodii would be like.[4] However, genetic analysis of chloroplast DNA of F1 hybrids between E. woodii and E. natalensis showed that all chloroplasts are inherited from the female E. natalensis,[19] indicating that multigenerational hybrid offspring would have E. natalensis chloroplasts and could never be "pure" E. woodii.

Distribution of hybrids

Several hybrids between E. woodii and other species of Encephalartos have been produced including:

Gallery

  • The bark of the specimen planted in Kirstenbosch botanical garden

    The bark of the specimen planted in Kirstenbosch botanical garden

  • Male cone of Encephalartos woodii

    Male cone of Encephalartos woodii

  • Portion of a leaf showing leaflets

    Portion of a leaf showing leaflets

  • The last two stems of Encephalartos woodii at oNgoye in the early 1900s

    The last two stems of Encephalartos woodii at oNgoye in the early 1900s

  • One of the original stems at the Durban Botanic Gardens

    One of the original stems at the Durban Botanic Gardens

  • Original stem at Durban Botanic Gardens, 2010

    Original stem at Durban Botanic Gardens, 2010

  • Offshoots (suckers) showing roots developing on the largest one

    Offshoots (suckers) showing roots developing on the largest one

  • A female E. natalensis x woodii with cones

    A female E. natalensis x woodii with cones

  • Encephalartos natalensis x E. woodii hybrid at Orto botanico di Palermo

    Encephalartos natalensis x E. woodii hybrid at Orto botanico di Palermo

References

  1. ^ a b Donaldson, J.S. (2003). "'Encephalartos woodii'". IUCN Red List of Threatened Species. 2003. Retrieved 16 November 2006.
  2. ^
    ISBN 0-7301-0338-2
    .
  3. Kew Botanical Gardens. Archived from the original
    on 20 June 2008. Retrieved 16 November 2006.
  4. ^ a b c d e f g Notten, A. (May 2002). "Encephalartos woodii Sander". Kirstenbosch National Botanical Garden and South African National Biodiversity Institute. Retrieved 16 November 2006.
  5. ^ a b c d Hill, K. (2004). "Encephalartos woodii". Royal Botanic Gardens Sydney. Retrieved 1 December 2006.
  6. ^ Viljoen, C.D. & van Staden, J. The genetic relationship between Encephalartos natalensis and E. woodii determined using RAPD fingerprinting. South African Journal of Botany Volume 72, Issue 4, November 2006, Pages 642-645
  7. ISBN 1-875093-28-1
    .
  8. ^ Ezemvelo KZN Wildlife/. Retrieved 7 September 2010.
  9. ^ a b c d e f g h Encephalartos woodii Sander: http://www.plantzafrica.com/plantefg/encephwoodii.htm, retrieved 7 September 2010
  10. ^ a b Czech Cycads: Cycads in Ireland: http://www.cykasy.cz/English/Cycads_in_Ireland.html, retrieved 20 September 2010.
  11. ^ National Botanical Gardens, Glasnevin: Conservation News: http://www.botanicgardens.ie/conserve/consnews.htm Archived 9 July 2011 at the Wayback Machine, retrieved 20 September 2010.
  12. ^ http://www.kew.org/plants/cycads/encephalartos_woodii.html Archived 30 December 2010 at the Wayback Machine, retrieved 7 September 2010.
  13. ^ Rare Plants in Pennsylvania. Wood's Cycad. Encephalartos woodii: "Travel Guide | Photos | Pictures of Longwood Gardens | Rare Plants in Pennsylvania . Wood's Cycad . Encephalartos woodii | Getaways . Restaurant . Travel Guide". Archived from the original on 14 August 2010. Retrieved 14 September 2010., retrieved 14 September 2010.
  14. ^ a b Lotusland Plant Collection: http://www.lotusland.org/explore-garden/gardens/cycad-garden/, retrieved 14 September 2010.
  15. ^ Compiled List of Cycad Gardens: http://www.plantapalm.com/vce/cycadsof/cycadgardens.htm Archived 17 July 2011 at the Wayback Machine, retrieved 14 September 2010.
  16. ^ a b c The King of Our Conservatory: http://www.facebook.com/note.php?note_id=296456165465, retrieved 14 September 2010.
  17. ^ Dutch Botanic Gardens Collections Foundation: http://www.nationale-plantencollectie.nl/UK/collectiehouders/Cycads-gen.htm[permanent dead link], retrieved 14 September 2010.
  18. ^ Los Gatos Plants - UK Cycad Resource: "Blogger: Anmelden". Archived from the original on 1 July 2012. Retrieved 14 September 2010., retrieved 14 September 2010.
  19. ^ Cafasso, D. et al. (2001). Maternal inheritance of plastids in Encephalartos Lehm. (Zamiaceae, Cycadales) Genome. 2001 (2):239-41.
  20. ^ "Encephalartos transvenosus x woodii at Aloes in Wonderland". www.aloesinwonderland.com. Retrieved 30 September 2022.
  21. ^ "Encephalartos arenarius x woodii at Aloes in Wonderland". www.aloesinwonderland.com. Retrieved 30 September 2022.
  22. ^ "Encephalartos horridus x woodii at Aloes in Wonderland". www.aloesinwonderland.com. Retrieved 30 September 2022.

External links

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