''Omphalea ankaranensis'' is a plant species

endemic 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 ...

to a small region in northern

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 ...

. Type locale is in

Antsiranana Antsiranana ( mg, Antsiran̈ana ), named Diego-Suárez prior to 1975, is a city in the far north of Madagascar. Antsiranana is the capital of Diana Region. It had an estimated population of 115,015 in 2013. History The bay and city originally u ...

Province, inside Réserve Speciale

Ankarana Ankarana Special Reserve in northern Madagascar was created in 1956. It is a small, partially vegetated plateau composed of 150-million-year-old middle Jurassic limestone. With an average annual rainfall of about , the underlying rocks have been e ...

, 7 km SE of Matsaborimanga. Plant grows on limestone soils. ''Omphalea ankaranensis'' is a tree up to 7 m tall. Leaves are heart-shaped, up to 16 cm long. Inflorescence is a racemous

thyrse A thyrse is a type of inflorescence in which the main axis grows indeterminately, and the subaxes (branches) have determinate growth.{{cite book , author1=Hickey, M., author2=King, C. , year=2001 , title=The Cambridge Illustrated Glossary of Bot ...

.Gillespie, Lynn Judith. 1997. ''Omphalea'' (Euphorbiaceae) in Madagascar: a new species and a new combination. Novon 7:127-136.
/ref>

References

{{Taxonbar, from=Q15367519 ankaranensis Endemic flora of Madagascar