Exaceae is a flowering plant tribe in the family
Gentianaceae
Gentianaceae is a family of flowering plants of 103 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.
Characteri ...
.
Exaceae comprises about 180
species
In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...
assigned to eight
monophyletic
In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ...
genera, with major centres of
endemism
Endemism is the state of a species being found 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 found elsew ...
in
continental
Africa
Africa is the world's second-largest and second-most populous continent, after Asia in both cases. At about 30.3 million km2 (11.7 million square miles) including adjacent islands, it covers 6% of Earth's total surface area ...
(about 78 endemic species and two endemic
genera),
Madagascar
Madagascar (; mg, Madagasikara, ), officially the Republic of Madagascar ( mg, Repoblikan'i Madagasikara, links=no, ; french: République de Madagascar), is an island country in the Indian Ocean, approximately off the coast of East Africa ...
(55 endemic species and four endemic
genera) and the southern tip of
India
India, officially the Republic of India (Hindi: ), is a country in South Asia. It is the seventh-largest country by area, the second-most populous country, and the most populous democracy in the world. Bounded by the Indian Ocean on the so ...
and
Sri Lanka
Sri Lanka (, ; si, ශ්රී ලංකා, Śrī Laṅkā, translit-std=ISO (); ta, இலங்கை, Ilaṅkai, translit-std=ISO ()), formerly known as Ceylon and officially the Democratic Socialist Republic of Sri Lanka, is an ...
(14 endemic species).
Genera
* ''
Exacum'' L. (syn. ''
Cotylanthera'' Blume)
* ''
Exochaenium'' Griseb.
* ''
Gentianothamnus'' Humbert
* ''
Klackenbergia'' Kissling
* ''
Lagenias'' E. Mey.
* ''
Ornichia'' Klack.
* ''
Sebaea
''Sebaea'' is a genus of annual plants in the family Gentianaceae. Species occur in Africa, Madagascar, India, China, Thailand, Australia and New Zealand. The genus was paraphyletic and has been split in four genera: ''Exochaenium'', ''Klackenber ...
'' Sol. ex R. Br. (syn. ''
Belmontia'')
* ''
Tachiadenus'' Griseb.
References
{{Taxonbar, from=Q5852986
Asterid tribes
Gentianaceae