''Medemia argun'' is a rare species of the palm tree family (

Arecaceae The Arecaceae () is a family (biology), family of perennial plant, perennial, flowering plants in the Monocotyledon, monocot order Arecales. Their growth form can be climbing palm, climbers, shrubs, tree-like and stemless plants, all commonly k ...

) native to

Egypt Egypt ( , ), officially the Arab Republic of Egypt, is a country spanning the Northeast Africa, northeast corner of Africa and Western Asia, southwest corner of Asia via the Sinai Peninsula. It is bordered by the Mediterranean Sea to northe ...

and

Sudan Sudan, officially the Republic of the Sudan, is a country in Northeast Africa. It borders the Central African Republic to the southwest, Chad to the west, Libya to the northwest, Egypt to the north, the Red Sea to the east, Eritrea and Ethiopi ...

. It is the only species in the genus ''Medemia''. The palm's dried dates have been found in ancient Egyptian tombs.

Description

''Medemia argun'' is a robust, solitary-stemmed,

dioecious Dioecy ( ; ; adj. dioecious, ) is a characteristic of certain species that have distinct unisexual individuals, each producing either male or female gametes, either directly (in animals) or indirectly (in seed plants). Dioecious reproduction is ...

palm up to tall with fan leaves forming a dense rounded crown. It grows in extreme

desert A desert is a landscape where little precipitation occurs and, consequently, living conditions create unique biomes and ecosystems. The lack of vegetation exposes the unprotected surface of the ground to denudation. About one-third of the la ...

conditions. It is typically found in dry river beds in which

ground water Groundwater is the water present beneath Earth's surface in rock and soil pore spaces and in the fractures of rock formations. About 30 percent of all readily available fresh water in the world is groundwater. A unit of rock or an unconsolidat ...

is likely to occur.

Distribution

''Medemia argun'' is found only in

oases In ecology, an oasis (; : oases ) is a fertile area of a desert or semi-desert environment Nubian Desert The Nubian Desert ( ) is in the eastern region of the Sahara, Sahara Desert, spanning approximately 400,000 km2 of northeastern Sudan and northern Eritrea, between the Nile and the Red Sea. The arid region is rugged and rocky and contains s ...

, in southern

and northern

. 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 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.

Conservation

The palm is an

IUCN Red List The International Union for Conservation of Nature (IUCN) Red List of Threatened Species, also known as the IUCN Red List or Red Data Book, founded in 1964, is an inventory of the global conservation status and extinction risk of biological ...

vulnerable species, due to

habitat loss Habitat destruction (also termed habitat loss or habitat reduction) occurs when a natural habitat is no longer able to support its native species. The organisms once living there have either moved elsewhere, or are dead, leading to a decrease ...

and

artisanal mining Artisanal and small-scale mining (ASM) is a blanket term for a type of subsistence mining involving a miner who may or may not be officially employed by a List of mining companies, mining company but works independently, mining minerals using the ...

. 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 In chemistry, cyanide () is an inorganic chemical compound that contains a functional group. This group, known as the cyano group, consists of a carbon atom triple-bonded to a nitrogen atom. Ionic cyanides contain the cyanide anion . This a ...

are used in gold mining, leading to the pollution of ground water. The palm is also threatened by climate change, which will likely stress existing populations and inhibit the recruitment of juveniles. In Egypt, the species occurs in Wadi Allaqi Biosphere Reserve and Dungul Oasis. In 2003 an ex situ conservation experiment was done in University of Aswan, Egypt, where 21 seedlings had been planted in the University desert garden. Some of them are now fruiting. ''Medemia argun'' has also been introduced to cultivation outside

Africa Africa is the world's second-largest and second-most populous continent after Asia. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth's land area and 6% of its total surfac ...

References

{{Taxonbar, from1=Q121334, from2=Q5487394 Coryphoideae Desert fruits Flora of Egypt Flora of Sudan Flora of North Africa Monotypic Arecaceae genera Taxonomy articles created by Polbot Vulnerable flora of Africa Dioecious plants