Diseae is an

orchid Orchids are plants that belong to the family Orchidaceae (), a diverse and widespread group of flowering plants with blooms that are often colourful and fragrant. Orchids are cosmopolitan plants that are found in almost every habitat on Eart ...

tribe The term tribe is used in many different contexts to refer to a category of human social group. The predominant worldwide use of the term in English is in the discipline of anthropology. The definition is contested, in part due to conflict ...

in the

subfamily In biological classification, a subfamily (Latin: ', plural ') is an auxiliary (intermediate) taxonomic rank, next below family but more inclusive than genus. Standard nomenclature rules end botanical subfamily names with "-oideae", and zo ...

Orchidoideae The Orchidoideae, or the orchidoid orchids, are a subfamily of the orchid family (Orchidaceae) that contains around 3630 species. Species typically have a single (monandrous), fertile anther which is erect and basitonic. Description The subfam ...

.. (See ''External links'' below). It was recognized in ''Genera Orchidacearum'' volume 2, which was published in 2001. It consisted of 12

genera Genus (; : genera ) is a taxonomic rank above species and below family as used in the biological classification of living and fossil organisms as well as viruses. In binomial nomenclature, the genus name forms the first part of the binomial s ...

in five subtribes. In

molecular phylogenetic Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...

studies that were published after 1999, it was shown that Diseae is

paraphyletic Paraphyly is a taxonomic term describing a grouping that consists of the grouping's last common ancestor and some but not all of its descendant lineages. The grouping is said to be paraphyletic ''with respect to'' the excluded subgroups. In co ...

over the tribe

Orchideae Orchideae is a tribe of orchids in the subfamily Orchidoideae. Historically, it was divided into 2 subtribes, Orchidinae and Habenariinae. The subtribe Orchidinae alone contains about 1,800 species. However, although some phylogenetic studies hav ...

.Emmanuel J. P. Douzery, Alec M. Pridgeon, Paul Kores, H. P. Linder, Hubert Kurzweil, and Mark W. Chase. 1999. "Molecular phylogenetics of Diseae (Orchidaceae): a contribution from nuclear ribosomal ITS sequences". ''American Journal of Botany'' 86(6):887-899
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/ref> In a

classification Classification is the activity of assigning objects to some pre-existing classes or categories. This is distinct from the task of establishing the classes themselves (for example through cluster analysis). Examples include diagnostic tests, identif ...

of orchids that was published in 2015, Diseae was not recognized, but was instead placed in

synonymy A synonym is a word, morpheme, or phrase that means precisely or nearly the same as another word, morpheme, or phrase in a given language. For example, in the English language, the words ''begin'', ''start'', ''commence'', and ''initiate'' are a ...

under Orchideae.Mark W. Chase, Kenneth M. Cameron, John V. Freudenstein, Alec M. Pridgeon, Gerardo A. Salazar, Cássio van den Berg, and André Schuiteman. 2015. "An updated classification of Orchidaceae". ''Botanical Journal of the Linnean Society'' 177(2):151-174. (See ''External links'' below). In 2007, a molecular phylogenetic study showed that the large genus ''Disa'' (~182 species) is

over the small genus ''Schizodium''.Benny Bytebier, Dirk U. Bellstedt, and Hans Peter Linder. 2007. "A molecular phylogeny for the large African orchid genus ''Disa''". ''Molecular Phylogenetics and Evolution'' 43(1):75-90. Benny Bytebier, Dirk U. Bellstedt, and Hans Peter Linder. 2008. "A New Phylogeny-Based Sectional Classification for the Large African Orchid Genus ''Disa''". ''Taxon'' 57(4):1233-1251. 19 pages. Accordingly, in the 2015 classification, the genus ''

Schizodium ''Disa'' is a genus of flowering plants in the family Orchidaceae. It comprises about 182 species. Most of the species are indigenous to tropical and southern Africa, with a few more in the Arabian Peninsula, Madagascar, and Réunion.Hans Peter ...

'' was sunk into ''

Disa Disa is the heroine of a Swedish legendary saga, which was documented by Olaus Magnus, in 1555. It is believed to be from the Middle Ages, but includes Old Norse themes. It was elaborated by Johannes Messenius in his drama ''Disa'', which was th ...

''. Also, the subtribe Huttonaeinae was sunk into Disinae, and the subtribe Satyriinae was sunk into

Orchidinae Orchideae is a tribe of orchids in the subfamily Orchidoideae. Historically, it was divided into 2 subtribes, Orchidinae and Habenariinae. The subtribe Orchidinae alone contains about 1,800 species. However, although some phylogenetic studies hav ...

. The expanded tribe Orchideae consisted of the subtribes Brownleeinae, Disinae, Coryciinae, and Orchidinae. ''

Disperis ''Disperis'' is a genus of plants in the orchid family, Orchidaceae. It has about 78 species.Mark W. Chase, Kenneth M. Cameron, John V. Freudenstein, Alec M. Pridgeon, Gerardo A. Salazar, Cássio van den Berg, and André Schuiteman. 2015. "An upd ...

'' was transferred from Coryciinae to Brownleeinae and ''

Pachites ''Pachites'' is a genus of flowering plants in the orchid family, Orchidaceae. It contains two known species, both endemic to South Africa.Hans Peter Linder and Hubert Kurzweil. 1999. ''Orchids of Southern Africa''. 504 pages. A. A. Balkema. .Kew ...

'' was transferred from Satyriinae to Disinae. The placement of ''Pachites'' and ''

Huttonaea ''Huttonaea'' is a genus of flowering plants from the orchid family, Orchidaceae. It contains 5 known species, all native to southern Africa (South Africa and Lesotho). This genus was named in honour of Caroline Hutton née Atherstone. # Refere ...

'' in Disinae was done with considerable doubt. Four genera were recognized in the subtribe Coryciinae ('' Evotella'', '' Ceratandra'', '' Corycium'' and '' Pterygodium''), even though it was known that ''Corycium'' and ''Pterygodium'' are

polyphyletic A polyphyletic group is an assemblage that includes organisms with mixed evolutionary origin but does not include their most recent common ancestor. The term is often applied to groups that share similar features known as Homoplasy, homoplasies ...

, with all but one species of ''Corycium'' composing a

clade In biology, a clade (), also known as a Monophyly, monophyletic group or natural group, is a group of organisms that is composed of a common ancestor and all of its descendants. Clades are the fundamental unit of cladistics, a modern approach t ...

that is deeply embedded within ''Pterygodium''.Richard J. Waterman, Anton Pauw, Timothy G. Barraclough, and Vincent Savolainen. 2009. "Pollinators underestimated: A molecular phylogeny reveals widespread floral convergence in oil-secreting orchids (sub-tribe Coryciinae) of the Cape of South Africa". ''Molecular Phylogenetics and Evolution'' 51(1):100-110. . The genera of Diseae have most or all of their

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

in southern Africa and

Madagascar Madagascar, officially the Republic of Madagascar, is an island country that includes the island of Madagascar and numerous smaller peripheral islands. Lying off the southeastern coast of Africa, it is the world's List of islands by area, f ...

. Diseae accounts for more than half of the orchids of southern Africa and has about 400 species. ''Disperis'' has a few species in

tropical The tropics are the regions of Earth surrounding the equator, where the sun may shine directly overhead. This contrasts with the temperate or polar regions of Earth, where the Sun can never be directly overhead. This is because of Earth's ax ...

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 ...

and

Asia Asia ( , ) is the largest continent in the world by both land area and population. It covers an area of more than 44 million square kilometres, about 30% of Earth's total land area and 8% of Earth's total surface area. The continent, which ...

, including

Malesia Malesia is a biogeographical region straddling the Equator and the boundaries of the Indomalayan and Australasian realms. It is a phytogeographical floristic region in the Paleotropical kingdom. It was first recognized as a distinct region ...

. ''Disa'' extends to the

Arabian Peninsula The Arabian Peninsula (, , or , , ) or Arabia, is a peninsula in West Asia, situated north-east of Africa on the Arabian plate. At , comparable in size to India, the Arabian Peninsula is the largest peninsula in the world. Geographically, the ...

and the

Mascarene Islands The Mascarene Islands (, ) or Mascarenes or Mascarenhas Archipelago is a group of islands in the Indian Ocean east of Madagascar consisting of islands belonging to the Republic of Mauritius as well as the French department of Réunion. Their na ...

. ''Pterygodium'' has one species in

Tanzania Tanzania, officially the United Republic of Tanzania, is a country in East Africa within the African Great Lakes region. It is bordered by Uganda to the northwest; Kenya to the northeast; the Indian Ocean to the east; Mozambique and Malawi to t ...

. '' Satyrium'' is mostly African, but extends through

South Asia South Asia is the southern Subregion#Asia, subregion of Asia that is defined in both geographical and Ethnicity, ethnic-Culture, cultural terms. South Asia, with a population of 2.04 billion, contains a quarter (25%) of the world's populatio ...

China China, officially the People's Republic of China (PRC), is a country in East Asia. With population of China, a population exceeding 1.4 billion, it is the list of countries by population (United Nations), second-most populous country after ...

.Hans Peter Linder and Hubert Kurzweil. 1999. ''Orchids of Southern Africa''. 504 pages. A. A. Balkema. .

References

External links

* *
page 14''Genera Orchidacearum'' volume 2Google Books

An updated classification of Orchidaceae (2015)Botanical Journal of the Linnean SocietyWiley Online Library

infrageneric classification of ''Disa''
{{Taxonbar, from=Q2958827 Orchidoideae tribes Historically recognized angiosperm taxa