Medemia

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Monocots
Cladus: Commelinids
Ordo: Arecales

Familia: Arecaceae
Subfamilia: Coryphoideae
Tribus: Borasseae
Subtribus: Hyphaeninae
Genus: Medemia
Species: M. argun
Name

Medemia Württemb. ex H.Wendl., Bot. Zeitung (Berlin) 39: 89 (1881)
References

von Württemberg, F. P. W. (1881) Botanische Zeitung (Berlin) 39: 90, 93. BHL
Govaerts, R. et al. 2015. Medemia in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2015 Oct. 19. Reference page.
International Plant Names Index. 2015. Medemia. Published online. Accessed: Oct. 19 2015.
Tropicos.org 2015. Medemia. Missouri Botanical Garden. Published on the internet. Accessed: 2015 Oct. 19.

Medemia argun is a rare species of the palm tree family (Arecaceae) native to Egypt and Sudan. It is the only species in the genus Medemia. The palm's dried dates have been found in ancient Egyptian tombs.[1]

Description

Medemia argun is a robust, solitary-stemmed, dioecious palm up to 10 m (33 ft) tall with fan leaves forming a dense rounded crown. It grows in extreme desert conditions. It is typically found in dry river beds in which ground water is likely to occur.[1]
Distribution

Medemia argun is found only in oases inside of the Nubian Desert, in southern Egypt and northern Sudan.[1][3][4][5][6] The global population is divided in several sub-populations, with the most important (>90%) part of the population occurring in northern Sudan. The global population of Medemia argun was estimated at about 7,400 individuals in the middle of the 2000s. In Egypt, only 32 individuals were counted at Dungul Oases in 2007 (Ibrahim and Baker 2009). Its area of occupancy is restricted to 880 km².[1]

Conservation

The palm is an IUCN Red List vulnerable species, due to habitat loss and artisanal mining. Currently, almost all the area where the palm occurs has been demarcated and leased by the government as concessions for national and foreign gold companies (Ali 2016, H. Ibrahim. pers. comm. 2017). Mining activities within the distribution of Medemia argun result in major landscape disturbance due to large scale excavations and tunneling. In addition, the mining companies seek ground water by drilling holes and digging exploration trenches, which cause both severe habitat degradation and destruction for the species. Moreover, mercury and cyanide are used in gold mining, leading to the pollution of ground water. [1]

The palm is also threatened by climate change, which will likely stress existing populations and inhibit the recruitment of juveniles.[1]

In Egypt, the species occurs in Wadi Allaqi Biosphere Reserve. In 2003 an ex situ conservation experiment was led in University of Aswan, Egypt, where 21 seedlings had been transferred to the University desert garden. Some of them are now fruiting. Medemia argun has also been introduced to cultivation outside Africa.[1]

References

Cosiaux, A., Ibrahim, H. & Baker, W.J. (2020). "Medemia argun". IUCN Red List of Threatened Species. 2020: e.T30401A2793256. doi:10.2305/IUCN.UK.2020-1.RLTS.T30401A2793256.en.
Kew World Checklist of Selected Plant Families
R. Govaerts & J. Dransfield (2005). World Checklist of Palms. Board of Trustees of the Royal Botanic Gardens, Kew.
L. Boulos (2005). Flora of Egypt. 4. Cairo: Al Hadara Publishing.
Haitham Ibrahim & William J. Baker (2009). "Medemia argun – past, present and future" (PDF). Palms. 53 (1): 9–21.
D. Dobignard & C. Chatelain (2010). Index synonymique de la flore d'Afrique du nord. 1. Conservatoire et jardin botaniques, Genève.