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Burkillanthus
''Burkillanthus'' is a monotypic genus of flowering plants in the citrus family, Rutaceae, containing the single species ''Burkillanthus malaccensis''. It is native to Sumatra in Indonesia. It is also native to the Malay Peninsula and Sarawak in Malaysia, but it is extirpated from the peninsula and in Sarawak it was only known from a single specimen collected in 1961. Its common name is Malay ghostlime.Citrus Variety Collection.
University of California, Riverside.
This species is part of the same subfamily (), tribe (), and subtribe (Citrinae), as genus ''

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Aurantioideae
Aurantioideae (sometimes known as Citroideae) is the subfamily within the rue and citrus family (Rutaceae) that contains the citrus. The subfamily's center of diversity is in the monsoon region of eastern Australasia, extending west through South Asia into Africa, and eastwards into Polynesia. Notable members include citrus (genus ''Citrus''), bael (''Aegle marmelos''), curd fruit (''Limonia acidissima''), species of genus ''Murraya'' such as curry tree (''M. koenigii'') and orange jessamine (''M. paniculata''), and the small genus ''Clausena''. Description Aurantioideae are smallish trees or large shrubs, or rarely lianas. Their flowers are typically white and fragrant. Their fruit are very characteristic hesperidia, usually of rounded shape and colored in green, yellowish or orange hues. Taxonomy The subfamily has been divided into two tribes, the ancestral Clauseneae and the more advanced Citreae, as in a 1967 classification. A 2021 classification by Appelhans et al. ba ...
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Citreae
Citreae is one of the two tribes of the flowering plant family Rutaceae, subfamily Aurantioideae, the other being Clauseneae. Subtribes and genera Three sub-tribes are included: * Triphasiinae ** '' Luvunga'' Buch.-Ham. ex Wight & Arn. ** '' Merope'' M.Roem. ** '' Monanthocitrus'' ** '' Pamburus'' Swingle ** '' Paramignya'' Wight ** ''Triphasia'' ** '' Wenzelia'' Merr. * Balsamocitrinae ** ''Aegle'' Corrêa – bael ** '' Aeglopsis'' Swingle ** '' Afraegle'' (Swingle) Engl. ** '' Balsamocitrus'' Stapf ** '' Feroniella'' Swingle ** '' Limonia'' L. – curd fruit ** ''Swinglea'' Merr. * Citrinae **'' Atalantia'' **'' Burkillanthus'' **'' Citropsis'' **''Citrus'' **'' Clymenia'' (may belong in ''Citrus'') **'' Hesperethusa'' **'' Naringi'' **'' Poncirus'' – trifoliate orange (may belong in ''Citrus'') **''Pleiospermium'' **'' Severinia'' Notable species in the Citrinae group include Bergamot orange, calamondin, citron, grapefruit, lemon, lime, orange, pummelo, ...
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Aurantioideae Genera
Aurantioideae (sometimes known as Citroideae) is the subfamily within the rue and citrus family (Rutaceae) that contains the citrus. The subfamily's center of diversity is in the monsoon region of eastern Australasia, extending west through South Asia into Africa, and eastwards into Polynesia. Notable members include citrus (genus ''Citrus''), bael (''Aegle marmelos''), curd fruit (''Limonia acidissima''), species of genus ''Murraya'' such as curry tree (''M. koenigii'') and orange jessamine (''M. paniculata''), and the small genus ''Clausena''. Description Aurantioideae are smallish trees or large shrubs, or rarely lianas. Their flowers are typically white and fragrant. Their fruit are very characteristic hesperidia, usually of rounded shape and colored in green, yellowish or orange hues. Taxonomy The subfamily has been divided into two tribes, the ancestral Clauseneae and the more advanced Citreae, as in a 1967 classification. A 2021 classification by Appelhans et al. bas ...
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Monotypic Taxon
In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unispecific" or "monospecific" is sometimes preferred. In botanical nomenclature, a monotypic genus is a genus in the special case where a genus and a single species are simultaneously described. In contrast, an oligotypic taxon contains more than one but only a very few subordinate taxa. Examples Just as the term ''monotypic'' is used to describe a taxon including only one subdivision, the contained taxon can also be referred to as monotypic within the higher-level taxon, e.g. a genus monotypic within a family. Some examples of monotypic groups are: Plants * In the order Amborellales, there is only one family, Amborellaceae and there is only one genus, '' Amborella'', and in this genus there is only one species, namely ''Amborella trichopoda ...
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Rutaceae
The Rutaceae is a family, commonly known as the rueRUTACEAE
in BoDD – Botanical Dermatology Database
or family, of s, usually placed in the order . Species of the family generally have s that divide into four or five parts, usually w ...
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Sumatra
Sumatra is one of the Sunda Islands of western Indonesia. It is the largest island that is fully within Indonesian territory, as well as the sixth-largest island in the world at 473,481 km2 (182,812 mi.2), not including adjacent islands such as the Simeulue, Nias, Mentawai, Enggano, Riau Islands, Bangka Belitung and Krakatoa archipelago. Sumatra is an elongated landmass spanning a diagonal northwest–southeast axis. The Indian Ocean borders the northwest, west, and southwest coasts of Sumatra, with the island chain of Simeulue, Nias, Mentawai, and Enggano off the western coast. In the northeast, the narrow Strait of Malacca separates the island from the Malay Peninsula, which is an extension of the Eurasian continent. In the southeast, the narrow Sunda Strait, containing the Krakatoa Archipelago, separates Sumatra from Java. The northern tip of Sumatra is near the Andaman Islands, while off the southeastern coast lie the islands of Bangka and Belitung, Karim ...
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Indonesia
Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of over 17,000 islands, including Sumatra, Java, Sulawesi, and parts of Borneo and New Guinea. Indonesia is the world's largest archipelagic state and the 14th-largest country by area, at . With over 275 million people, Indonesia is the world's fourth-most populous country and the most populous Muslim-majority country. Java, the world's most populous island, is home to more than half of the country's population. Indonesia is a presidential republic with an elected legislature. It has 38 provinces, of which nine have special status. The country's capital, Jakarta, is the world's second-most populous urban area. Indonesia shares land borders with Papua New Guinea, East Timor, and the eastern part of Malaysia, as well as maritime borders with Singapore, Vietnam, Thailand, the Philippines, Australia, Palau, and India ...
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Malay Peninsula
The Malay Peninsula (Malay: ''Semenanjung Tanah Melayu'') is a peninsula in Mainland Southeast Asia. The landmass runs approximately north–south, and at its terminus, it is the southernmost point of the Asian continental mainland. The area contains Peninsular Malaysia, Southern Thailand, and the southernmost tip of Myanmar (Kawthaung). The island country of Singapore also has historical and cultural ties with the region. The indigenous people of the peninsula are the Malays, an Austronesian people. The Titiwangsa Mountains are part of the Tenasserim Hills system and form the backbone of the peninsula and the southernmost section of the central cordillera, which runs from Tibet through the Kra Isthmus, the peninsula's narrowest point, into the Malay Peninsula. The Strait of Malacca separates the Malay Peninsula from the Indonesian island of Sumatra, and the south coast is separated from the island of Singapore by the Straits of Johor. Etymology The Malay term ''Tanah Me ...
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Sarawak
Sarawak (; ) is a States and federal territories of Malaysia, state of Malaysia. The largest among the 13 states, with an area almost equal to that of Peninsular Malaysia, Sarawak is located in northwest Borneo Island, and is bordered by the Malaysian state of Sabah to the northeast, Kalimantan (the Indonesian portion of Borneo) to the south, and Brunei in the north. The capital city, Kuching, is the largest city in Sarawak, the economic centre of the state, and the seat of the Sarawak state government. Other cities and towns in Sarawak include Miri, Malaysia, Miri, Sibu, and Bintulu. As of 2021, the population of Sarawak was estimated to be around 2.45 million. Sarawak has an equatorial climate with tropical rainforests and abundant animal and plant species. It has several prominent cave systems at Gunung Mulu National Park. Rajang River is the longest river in Malaysia; Bakun Dam, one of the largest dams in Southeast Asia, is located on one of its tributaries, the Balui River ...
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Malaysia
Malaysia ( ; ) is a country in Southeast Asia. The federation, federal constitutional monarchy consists of States and federal territories of Malaysia, thirteen states and three federal territories, separated by the South China Sea into two regions: Peninsular Malaysia and Borneo's East Malaysia. Peninsular Malaysia shares a land and maritime Malaysia–Thailand border, border with Thailand and Maritime boundary, maritime borders with Singapore, Vietnam, and Indonesia. East Malaysia shares land and maritime borders with Brunei and Indonesia, and a maritime border with the Philippines and Vietnam. Kuala Lumpur is the national capital, the country's largest city, and the seat of the Parliament of Malaysia, legislative branch of the Government of Malaysia, federal government. The nearby Planned community#Planned capitals, planned capital of Putrajaya is the administrative capital, which represents the seat of both the Government of Malaysia#Executive, executive branch (the Cabine ...
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Local Extinction
Local extinction, also known as extirpation, refers to a species (or other taxon) of plant or animal that ceases to exist in a chosen geographic area of study, though it still exists elsewhere. Local extinctions are contrasted with global extinctions. Local extinctions mark a change in the ecology of an area. In recent times, local extinction has sometimes been followed by a replacement of the species taken from other locations; wolf reintroduction is an example of this. The term "local extinction" is highly vernacular. The more proper biological term is ''extirpation''. Discussion Glaciation can lead to local extinction. This was the case during the Pleistocene glaciation event in North America. During this period, most of the native North American species of earthworm were killed in places covered by glaciation. This left them open for colonization by European earthworms brought over in soil from Europe. Species naturally become extirpated from islands over time. The number ...
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Citrus
''Citrus'' is a genus of flowering plant, flowering trees and shrubs in the rue family, Rutaceae. Plants in the genus produce citrus fruits, including important crops such as Orange (fruit), oranges, Lemon, lemons, grapefruits, pomelos, and lime (fruit), limes. The genus ''Citrus'' is native to South Asia, East Asia, Southeast Asia, Melanesia, and Australia (continent), Australia. Various citrus species have been used and domesticated by indigenous cultures in these areas since ancient times. From there its cultivation spread into Micronesia and Polynesia by the Austronesian expansion (c. 3000–1500 BCE); and to the Middle East and the Mediterranean (c. 1200 BCE) via the incense trade route, and onwards to Europe and the Americas. History Citrus plants are native to subtropical and tropical regions of Asia, Island Southeast Asia, Near Oceania, and northeastern Australia. Domestication of citrus species involved much hybridization and introgression, leaving much uncertainty ab ...
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