''Psyllocarpus'' is a genus of

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (). The term angiosperm is derived from the Ancient Greek, Greek words (; 'container, vessel') and (; 'seed'), meaning that the seeds are enclosed with ...

s belonging to the family

Rubiaceae Rubiaceae () is a family (biology), family of flowering plants, commonly known as the coffee, madder, or bedstraw family. It consists of terrestrial trees, shrubs, lianas, or herbs that are recognizable by simple, opposite leaves with Petiole ( ...

. It is an

endemic Endemism is the state of a species being found only 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 foun ...

genus of Brazil found in

Amazonia The Amazon rainforest, also called the Amazon jungle or Amazonia, is a moist broadleaf tropical rainforest in the Amazon biome that covers most of the Amazon basin of South America. This basin encompasses , of which are covered by the rainf ...

Caatinga Caatinga () is a type of semi-arid tropical vegetation, and an ecoregion characterized by this vegetation in interior northeastern Brazil. The name "Caatinga" comes from the Tupi word '' ka'atinga'', meaning "white forest" or "white vegetat ...

, and

Cerrado The Cerrado () is a vast ecoregion of Tropics, tropical savanna in central Brazil, being present in the states of Goiás, Mato Grosso do Sul, Mato Grosso, Tocantins, Maranhão, Piauí, Bahia, Minas Gerais, São Paulo (state), São Paulo, Paraná ...

. In 1979 the genus was revised by Kirkbride into two

sections Section, Sectioning, or Sectioned may refer to: Arts, entertainment and media * Section (music), a complete, but not independent, musical idea * Section (typography), a subdivision, especially of a chapter, in books and documents ** Section sig ...

, ''Psyllocarpus'' sect. ''Psyllocarpus'' and ''P.'' sect ''Amazonica'', based on geographic distribution and

morphology Morphology, from the Greek and meaning "study of shape", may refer to: Disciplines *Morphology (archaeology), study of the shapes or forms of artifacts *Morphology (astronomy), study of the shape of astronomical objects such as nebulae, galaxies, ...

. ''

Plants of the World Online Plants of the World Online (POWO) is an online taxonomic database published by the Royal Botanic Gardens, Kew. History Following the Convention on Biological Diversity, the Royal Botanic Gardens in Kew launched Plants of the World Online i ...

'' treats the genus as a synonym of ''

Tapanhuacanga ''Tapanhuacanga'' is a genus of flowering plants in the family Rubiaceae. It includes 11 species endemic to Brazil. Species 11 species are accepted. *''Tapanhuacanga asparagoides'' *''Tapanhuacanga bahiensis'' *''Tapanhuacanga campinorum'' *' ...

''.

Species

''Psyllocarpus'' sect. ''Psyllocarpus'' comprises ''P. asparagoides'', ''P. bahiensis'', ''P. goiasensis'', ''P. laricoides'', ''P. phyllocephalus'', ''P. scatignae'', ''P. schwackei''. ''Psyllocarpus'' sect. ''Amazonica'' includes ''P. campinorum'', ''P. cururuensis'', ''P. psyllocarpoides.'' ''Psyllocarpus intermedius'' and ''Psyllocarpus densifolius'' are found in the same geographical region at sect. ''Psyllocarpus'' but are morphologically distinct. Carmo et al. (2021) recognized the

monotypic In biology, a monotypic taxon is a taxonomic group (taxon) that contains only one immediately subordinate taxon. A monotypic species is one that does not include subspecies or smaller, infraspecific taxa. In the case of genera, the term "unisp ...

genus '' Diadorimia'' to accommodate ''P. densifolius'', while the determination of ''P. intermedius'' is pending further investigation.

References

{{Authority control Rubiaceae Endemic flora of Brazil Historically recognized Rubiaceae genera