''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 Members of the ...

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, Zurich – 15 January 1819) was a physician and professor of botany in Zurich, Switzerland. He was also an entomologist. With Austrian botanist Joseph August Schultes, he published the 16th edition of Ca ...

and

Josef August Schultes Josef (Joseph) August Schultes (15 April 1773 in Vienna – 21 April 1831 in Landshut) was an Austrian botanist and professor from Vienna. Together with Johann Jacob Roemer (1763–1819), he published the 16th edition of Linnaeus' ''Systema V ...

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 ancient world from around 1500 BC to 300 BC. It is often roughly divided into the following periods: Mycenaean Greek (), Dark Ages (), the Archaic peri ...

words ''makros'' "long" and ''anther'' "flower(ing)". George Bentham described it as ''Odontadenia speciosa'' in 1841 from material collected from Guyana in 1837. It is the

type species In 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 species that contains the biological type specimen ...

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