''Stapelianthus'' is a genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...

s in the family

Apocynaceae Apocynaceae (from ''Apocynum'', Greek for "dog-away") is a family of flowering plants that includes trees, shrubs, herbs, stem succulents, and vines, commonly known as the dogbane family, because some taxa were used as dog poison Members of the ...

, first described as a genus in 1933. The entire genus is endemic to

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 ...

and is concentrated in the far south of the island. The genus is defined by the unique corona structure of its flowers.

Species

Species accepted by the

Plants of the World Online Plants of the World Online (POWO) is an online database published by the Royal Botanic Gardens, Kew. It was launched in March 2017 with the ultimate aim being "to enable users to access information on all the world's known seed-bearing plants by ...

as of January 2023 ;formerly includedThe Plant List
/ref> # ''Stapelianthus baylissii'', syn of '' Tridentea baylissii'' # ''Stapelianthus choananthus'', syn of ''

Tridentea choanantha ''Tridentea'' is a genus of succulent plant in the family Apocynaceae, endemic to southern Africa. Name and history ''Tridentea'' was first described as a genus in 1812, and its name refers to the three "teeth" on each interstaminal segment of ...

'' ;Taxonomy The species are extremely close to each other genetically, however the genus overall is very divergent from its relatives on the mainland. Phylogenetic studies have shown the genus to be most closely related to a large and widespread branch of stapeliads from mainland Africa, comprising the genera ''

Huernia The genus ''Huernia'' (family Apocynaceae, subfamily Asclepiadoideae) consists of perennial, stem succulents from Eastern and Southern Africa and Arabia, first described as a genus in 1810.Brown, Robert. 1810. On the Asclepiadeae 11 The flowers ...

'', ''

Tavaresia ''Tavaresia'' is a genus of plants in the family Apocynaceae, first described as a genus in 1902. It is native to southern Africa. ;Species # ''Tavaresia angolensis'' Welw. - Angola # ''Tavaresia barklyi'' (Dyer) N.E.Br. - South Africa # ''Tav ...

'' and a mixed sub-branch including ''

Orbea Orbea is a bicycle manufacturer based in Mallabia, Spain. It is part of the Mondragón Cooperative Corporation and Spain's largest bicycle manufacturer. Orbea manufactures and assembles bikes at their own factory in Mallabia, the other models ...

'', ''

Piaranthus ''Piaranthus'' is a succulent plant genus in the subfamily Asclepiadoideae, in the family Apocynaceae. It was first described in 1810. Its name comes from Greek and is descriptive of the fleshy, succulent flowers typical of the genus (''"piar-" ...

'' and ''

Stapelia ''Stapelia'' is a genus of low-growing, spineless, stem succulent plants, predominantly from South Africa with a few from other parts of Africa. Several Asian and Latin American species were formerly included but they have all now been transfe ...

''.

References

Apocynaceae genera Endemic flora of Madagascar Asclepiadoideae {{Apocynaceae-stub