Exaceae is a flowering plant tribe in the family

Gentianaceae Gentianaceae is a family of flowering plants of 105 genera and about 1600 species. Etymology The family takes its name from the genus ''Gentiana'', named after the Illyrian king Gentius. Distribution Distribution is cosmopolitan (species), cosm ...

. Exaceae comprises about 180

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), ...

assigned to eight

monophyletic In biological cladistics for the classification of organisms, monophyly is the condition of a taxonomic grouping being a clade – that is, a grouping of organisms which meets these criteria: # the grouping contains its own most recent co ...

genera, with major centres of

endemism Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

in continental

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 ...

(about 78 endemic species and two endemic genera),

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 ...

(55 endemic species and four endemic genera) and the southern tip of

India India, officially the Republic of India, is a country in South Asia. It is the List of countries and dependencies by area, seventh-largest country by area; the List of countries by population (United Nations), most populous country since ...

and

Sri Lanka Sri Lanka, officially the Democratic Socialist Republic of Sri Lanka, also known historically as Ceylon, is an island country in South Asia. It lies in the Indian Ocean, southwest of the Bay of Bengal, separated from the Indian subcontinent, ...

(14 endemic species).

Genera

* ''

Exacum ''Exacum'' ( ) is a genus of plant in family Gentianaceae. It contains 75 species native to tropical regions of sub-Saharan Africa, southern Arabian Peninsula, south and southeast Asia, New Guinea, and Australia. Species 75 species are accepted. ...

'' L. (syn. '' Cotylanthera'' Blume) * '' Exochaenium'' Griseb. * '' Gentianothamnus'' Humbert * '' Klackenbergia'' Kissling * '' Lagenias'' E. Mey. * '' Ornichia'' Klack. * '' Sebaea'' Sol. ex R. Br. (syn. '' Belmontia'') * '' Tachiadenus'' Griseb.

References

{{Taxonbar, from=Q5852986 Asterid tribes Gentianaceae