Medemia

Last updated

Medemia
Medemia argun (aspect general) - Jardin de Nong-Nooch.jpg
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Arecales
Family: Arecaceae
Subfamily: Coryphoideae
Tribe: Borasseae
Genus: Medemia
Wuert. ex H.Wendl.
Species:
M. argun
Binomial name
Medemia argun
Synonyms [2]
  • Hyphaene argunMart.
  • Areca passalacquaeKunth
  • Medemia abiadensisH.Wendl.

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]

Contents

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 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. [1]

Related Research Articles

<span class="mw-page-title-main">Oasis</span> Fertile area in a desert environment

In ecology, an oasis is a fertile area of a desert or semi-desert environment that sustains plant life and provides habitat for animals. Surface water and land may be present, or water may only be accessible from wells or underground channels created by humans. In geography, an oasis may be a current or past rest stop on a transportation route, or less-than-verdant location that nonetheless provides access to underground water through deep wells created and maintained by humans.

<i>Yucca brevifolia</i> Species of plant

Yucca brevifolia is a plant species belonging to the genus Yucca. It is tree-like in habit, which is reflected in its common names.

<span class="mw-page-title-main">Trumpeter finch</span> Species of bird

The trumpeter finch is a small passerine bird in the finch family Fringillidae. It is mainly a desert species which is found in North Africa and Spain through to southern Asia. It has occurred as a vagrant in areas north of its breeding range.

<i>Hyphaene thebaica</i> Species of plant

Hyphaene thebaica, with common names doum palm and gingerbread tree, is a type of palm tree with edible oval fruit. It is a native to the Arabian Peninsula and also to the northern half and western part of Africa where it is widely distributed and tends to grow in places where groundwater is present.

<i>Washingtonia filifera</i> Species of palm tree

Washingtonia filifera, the desert fan palm, California fan palm, or California palm, is a flowering plant in the palm family Arecaceae, native to the far southwestern United States and Baja California, Mexico. Growing to 15–20 m (49–66 ft) tall by 3–6 m (10–20 ft) broad, it is an evergreen monocot with a tree-like growth habit. It has a sturdy, columnar trunk and waxy, fan-shaped (palmate) leaves.

<span class="mw-page-title-main">Nubian Desert</span> Desert east of the Nile in Sudan and Eritrea

The Nubian Desert is in the eastern region of the 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 some dunes, it also contains many wadis that die out before reaching the Nile. The average annual rainfall in the Nubian Desert is less than 5 inches (130 mm).

<i>Aiphanes</i> Genus of spiny palms native to tropical South and Central America and the Caribbean

Aiphanes is a genus of spiny palms which is native to tropical regions of South and Central America and the Caribbean. There are about 26 species in the genus, ranging in size from understorey shrubs with subterranean stems to subcanopy trees as tall as 20 metres (66 ft). Most have pinnately compound leaves ; one species has entire leaves. Stems, leaves and sometimes even the fruit are covered with spines. Plants flower repeatedly over the course of their lifespan and have separate male and female flowers, although these are borne together on the same inflorescence. Although records of pollinators are limited, most species appear to be pollinated by insects. The fruit are eaten by several birds and mammals, including at least two species of amazon parrots.

<i>Ravenea</i> Genus of palms

Ravenea is a genus of 20 known species of palms, all native to Madagascar and the Comoros.

<i>Brahea edulis</i> Species of palm

Brahea edulis, the Guadalupe palm or palma de Guadalupe, is a palm endemic to Guadalupe Island, Mexico, although a few stands have been planted elsewhere. It is a fan palm which grows 4.50 to 13 metres tall. It grows on the island between 400 and 1,000 metres above mean sea level (ASL), with this altitudinal zonation producing one of the few fog oases present in North America.

<span class="mw-page-title-main">Wildlife of Jordan</span>

The wildlife of Jordan includes its flora and fauna and their natural habitats. Although much of the country is desert, it has several geographic regions, each with a diversity of plants and animals adapted to their own particular habitats. Fossil finds show that in Palaeolithic times, the region had Syrian brown bears, Asiatic lions, zebras, Asian elephants, and rhinoceroses, but these species are all now extinct in this region.

<span class="mw-page-title-main">Wildlife of Chad</span>

The wildlife of Chad is composed of its flora and fauna. Bush elephants, West African lions, buffalo, hippopotamuses, Kordofan giraffes, antelopes, African leopards, cheetahs, hyenas, and many species of snakes are found there, although most large carnivore populations have been drastically reduced since the early 20th century. Elephant poaching, particularly in the south of the country in areas such as Zakouma National Park, is a severe problem.

<span class="mw-page-title-main">Wildlife of Egypt</span> Flora and fauna of Egypt

The wildlife of Egypt is composed of the flora and fauna of this country in northeastern Africa and southwestern Asia, and is substantial and varied. Apart from the fertile Nile Valley, which bisects the country from south to north, the majority of Egypt's landscape is desert, with a few scattered oases. It has long coastlines on the Mediterranean Sea, the Gulf of Suez, the Gulf of Aqaba and the Red Sea. Each geographic region has a diversity of plants and animals each adapted to its own particular habitat.

<i>Phoenicophorium</i> Genus of palms

Phoenicophorium, the thief palm, is a monotypic genus of flowering plant in the family Arecaceae. The sole species is Phoenicophorium borsigianum.

Ravenea musicalis, or the river palm, is a species of flowering plant in the family Arecaceae. Also known by the Antanosy word "torendriky," meaning "submerged trunk", R. musicalis is known for being the only truly aquatic palm tree. Like many mangrove trees, R. musicalis seeds germinate within the fruit, and the seedling takes root underwater. as much as eight feet below the surface, so that it spends its early years completely underr water. Endemic to Madagascar, R. musicalis was first discovered in 1993 by Henk Beentje on an expedition funded by the McDonald's restaurant. although of course it was ethnoknown by the Antanosy People for centuries. This palm is listed in the IUCN Red List. This tree is harvested by local people primarily for building material and food. Over-harvesting, habitat degradation and habitat loss threaten the remaining populations. Horticulturalists prize R. musicalis for its rarity and unique life history.

<span class="mw-page-title-main">Garden slender salamander</span> Species of slender salamander

The Garden slender salamander or Southern California slender salamander is a species of salamander in the family Plethodontidae. It is endemic to northern Baja California in Mexico and Southern California in the United States.

<span class="mw-page-title-main">Grey-crowned palm-tanager</span> Species of bird endemic to Hispaniola

The grey-crowned palm-tanager or grey-crowned tanager is a Near Threatened species of bird in the family Phaenicophilidae, the Hispaniolan palm-tanagers. It is endemic to the Caribbean island of Hispaniola, in both the Dominican Republic and Haiti.

<i>Aloidendron ramosissimum</i> Species of flowering plant

Aloidendron ramosissimum, formerly Aloe ramosissima, is a species of flowering plant in the family Asphodelaceae. It is endemic to the Richtersveld at the border between South Africa and Namibia, where it grows on desert slopes and in ravines. Its common name is maiden's quiver tree.

<i>Nypa fruticans</i> Species of palm

Nypa fruticans, commonly known as the nipa palm or mangrove palm, is a species of palm native to the coastlines and estuarine habitats of the Indian and Pacific Oceans. It is the only palm considered adapted to the mangrove biome. The genus Nypa and the subfamily Nypoideae are monotypic taxa because this species is their only member.

<i>Cyrtostachys renda</i> Species of palm

Cyrtostachys renda, also known by the common names red sealing wax palm and lipstick palm, is a palm that is native to Thailand, Malaysia, Sumatra and Borneo in Indonesia. It is the only species of the genus Cyrtostachys that can be found to the west of the Wallace Line, the faunal boundary separating the biogeographic realms of Asia and Wallacea. Cyrtostachys renda's name is derived from several words: the Greek prefix κυρτό- (cyrto-) meaning bent or curved, the Greek word σταχυς (stachys) meaning "an ear of grain", and "renda" a Malayan Aboriginal word for palm, which happens to be homonymous to the Portuguese word "renda," meaning income.

<span class="mw-page-title-main">Borasseae</span> Tribe of palms

Borasseae is a tribe in the palm subfamily Coryphoideae. The tribe ranges from southern Africa and Madagascar north through the Arabian Peninsula to India, Indochina, Indonesia and New Guinea. Several genera are restricted to islands in the Indian Ocean. The two largest genera, Hyphaene and Borassus, are also the most widespread.

References

  1. 1 2 3 4 5 6 7 8 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 . Retrieved 15 November 2021.
  2. Kew World Checklist of Selected Plant Families
  3. R. Govaerts & J. Dransfield (2005). World Checklist of Palms. Board of Trustees of the Royal Botanic Gardens, Kew.
  4. L. Boulos (2005). Flora of Egypt. Vol. 4. Cairo: Al Hadara Publishing.
  5. Haitham Ibrahim & William J. Baker (2009). "Medemia argun – past, present and future" (PDF). Palms . 53 (1): 9–21.
  6. D. Dobignard & C. Chatelain (2010). Index synonymique de la flore d'Afrique du nord. Vol. 1. Conservatoire et jardin botaniques, Genève.