''Odontadenia macrantha'' is a vine of 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. Notable mem ...

native to Central and South America. The cylindrical stem is either woody or just woody at the base. The smooth oval leaves are long by wide, and sit on long petioles. They are oppositely arranged on the stem. The orange or yellow flowers are in diameter with a long tube. However, flower shape and colour can vary considerably. Flowering takes place all year, with a peak from December to August, while fruiting peaks from April to October; the smooth seed pods are long by wide. It was originally described as ''Echites macrantha'' by Austrian botanists

Johann Jacob Roemer Johann Jacob Roemer (8 January 1763, Zürich – 15 January 1819) was a Swiss physician and professor of botany in Zürich, Switzerland. He was also an entomologist. With Austrian botanist Joseph August Schultes, he published the 16th edition of ...

and Josef August Schultes in 1819 from material from Brazil. The species name is derived from the

Ancient Greek Ancient Greek (, ; ) includes the forms of the Greek language used in ancient Greece and the classical antiquity, ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Greek ...

words ''makros'' "long" and ''anther'' "flower(ing)".

George Bentham George Bentham (22 September 1800 – 10 September 1884) was an English botanist, described by the weed botanist Duane Isely as "the premier systematic botanist of the nineteenth century". Born into a distinguished family, he initially studie ...

described it as ''Odontadenia speciosa'' in 1841 from material collected from Guyana in 1837. It is the

type species In International_Code_of_Zoological_Nomenclature, zoological nomenclature, a type species (''species typica'') is the species name with which the name of a genus or subgenus is considered to be permanently taxonomically associated, i.e., the spe ...

of the genus. ''Odontadenia caudigera'' was described by Ann Woodson in 1936 from a collection from Belize. Also found in Nicaragua and Costa Rica, this was considered a separate species on account of its smaller and differently shaped corolla, but intermediate flowers have been found on the same plant so is regarded as conspecific. '' Odontadenia sylvestris'', described by Brazil as distinct on a similar basis, is also regarded as a variant of ''O. macrantha''. ''Odontadenia macrantha'' is native to Central and South America, from Guatemala in the north to Brazil in the south, as well as the West Indies, from sea level to elevation. It is occasionally cultivated in Singapore.

References

{{Taxonbar, from=Q15368817 Flora of Oaxaca Odontadenieae Plants described in 1819 Flora of Brazil Flora of Guatemala Flora of Guyana